i , 
8 GlIRROIl.lON MEMORANDUM FROM: Brenda L, Johnson, Executive Assistant PUBLIC WORKS DEPARTMENT DATE: April 18, 2001 SUBJECT: DrainagelStormwater Utility Fee Survey We are conducting
research regarding drainage fees imposed by neighboring Cities, and respectfully request your assistance in providing responses to the following survey questions: • What is the monthly
r.esidential fee? ldorJl;; What is the monthly commercial fee? 􀁴􀁊􀁯􀁾I: e What is the monthly industrial fee? I'Jo 1\11& e Does the City charge school districts a drainage fee? NO
o Does the City allow any exemptions from the fees? Ifso, which entities are exempt? /J/At o Is the fee based on area ofimpervious cover for commercial/industrial properties? N /A e
Does the residential fee apply to apartments, or single-family? ,u /.6o How is the fee tor apartments calculated? N /). o What is the total annual revenue? Nok\.E" @'''hat is the revenue
from the fees used for (Le., maintenance, capital improvements, other)? iI-l/.a. It would also be helpful to know how long it took to implement the fee, as well as the length of time
the fee has been in place and assessed on a regular basis. l'ln... The information being provided in this survey will be most helpful to us in completing our research, and we appreciate
your cooperation in taking the time to provide the data. It would be beneficial to have your complcted surveys returned to me, via E-mail or FAX, by Thursday, April 19, 2001. Should
you have any questions or require additional information, please don't hesitate to contact my office. Again, thank you for your time. BRENDA L • .JOHNSON Phone: (972) 466-4291 FAX: (972)
466-3193 brendajohnson@cityofcarrollton,com 
MICHAEL E. MURPHY, P.E. Director of Fublic Works (972) 450-2878 (972) 450·2837 FAX mmurphy@ci.addison.tx.us E-mail TQwn of Addison 16801 WestgTove Dr. P.O. Box 0010, Addison, Texas 75001·9010
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I N T E R MEMO OFF ICE RECEIVED To: Chief James McLaughlin, JrjJ JlI//From: Lieutenant Bob McKitrick" 'fl'J!l I􀁾􀁗􀀬0 !"" lSubject: Tunnel Infonnation 􀁾􀁉􀀠... 􀀧􀁾􀀠___ I Date: May
30, 1997 On May 22, 1997 Captain Davis, Captain McCarley, Communications Supervisor Joni Ramsey, and I met with City Engineer John Baumgartner in reference to the new tunnel proposed
underneath the airport. Mr. Baumgartner gave us what infonnation he currently has on the tunnel. The proposed tunnel will be approximately 1,250 feet long and 20 feet high with two lanes,
one in each direction. Each lane will be approximately 14 feet wide with a 3 foot walkway on both sides for emergency pedestrian traffic and maintenance. The total length ofthis project
is 3,650 feet. Three unmanned toll booths are currently planned with several lanes feeding in and out of the area. According to infonnation we have now, the tunnel is designed for toll
tag vehicles only. It is still unknown what kind ofturnaround areas will be used for vehicles. The tunnel will be equipped with a ventilation system, a sump pump system, and a fire sprink1er
system. Lighting will be inside the tunnel, decreasing and increasing in foot candle power according to need ofinterior and exterior light aVailability. Video surveillance is proposed,
and may possibly be monitored at the Tollway DPS office. At this time, we have expressed communications concerns with radios, cell phones, placement of emergency phones in the 􀁴􀁵􀁮􀁮􀁥􀁾􀀠and
emergency response procedures. However, at this stage of the project, we don't have any absolutes. On May 23, 1997 the Baytown Police Department, Fire Department, Emergency Management
Division, and the city engineers were contacted by phone for infonnation on the Baytown Tunnel. The police department advised the tunnel had been closed for over a year and a bridge
had been built over it. They provided the following infonnation: Accidents were common, especially head-on collisions due to no barrier between the two lanes of traffic. Clearing an
accident took from 30 minutes to one hour depending on traffic. Four lane feeders in and out ofthe tunnel created a bottle neck during peak traffic hours. 
Chief James McLaughlin, Jr. Page 2 May 30, 1997 Baytown Fire Department advised that car fires were difficult to deal with due to poor placement of stand pipes and hose cabinets. Even
though the tunnel had a ventilation system, the fire department advised that black smoke would be everywhere after a car fire, making visibility difficult inside the tunnel. The tunnel
normally has to be shut down afterwards to clean all the soot. Assistant Fire Chief John Adkins advised that motorists using tunnel usually allowed an extra 30 minutes travel time due
to the uncertain status oftraffic. Baytown Fire Department further advised no hazardous materials were allowed in the tunnel. The Emergency Management Director, Mr. Howard Brister, advised
tunnel was not used for any emergency evacuation planning due to traffic problems, plus the possibility of poor communication via cell phones, car radios, and emergency response personnel's
radios. He agreed with other departments that accidents, stalled vehicles, and traffic delays were the biggest problem with the tunnel, and he was glad to see the bridge utilized to
alleviate traffic congestion. The Baytown City Engineer's Office was contacted and I spoke to Ms. Marla Stevens, Assistant City Engineer. She advised me that the Baytown Tunnel was under
the management ofthe Texas Department of Transportation and the tunnel was 40 years old. Tunnel was monitored at both ends by the Texas Department ofTransportation personnel who had
wreckers stationed at each end. Tunnel was monitored by video 24 hours a day"7 days a week. The tunnel had red and green flashing lights with gate signage to open or close tunnel at
any time. She stated the tunnel was approximately one mile long, had two traffic lanes (center stripped), and a two foot maintenance walkway with pipe chases on each side ofthe tunnel.
Speed in the tunnel was 35 miles per hour. The Baytown Tunnel was not a toll tunnel and had no booths to impede traffic flow. Ms. Stevens advised that traffic volume was 30,000 to 40,000
vehicles vehicles a day. Tunnel did have turnaround areas at each end. She was given some base information on our proposed tunnel and gave the following recommendations. 1. Access doors
on the sides ofthe tunnel leading into the tunnel for emergency pedestrian traffic, maintenance purposes, and an access point for emergency personnel responses. 2. Fire sprinkler system,
ventilation system, and sump pump system 3. Communications equipment to enhance radio, telephone, or cell phone transmissions. 4. A second tunnel iffeasible so each tunnel can have one-way
traffic. 5. Gates, lights, and signage to open or close the tunnel and give motorists advanced warnings. 6. No admission ofhazardous materials. 7. Video and sound equipment to monitor
activities in the tunnel. 8. No pedestrian or bicycle traffic RMlaf 
􀁓􀁾􀁾􀀢􀁂􀁙􀀺􀁘􀁅􀁒􀁏􀁘􀀠7033 ; 6-4-37 ; 3:10PM; HUITT-ZOLLARS, 􀁉􀁎􀁃􀀮􀁾􀀠372 450 2837;# 11 4 HUIIT-ZOLLARS FACSIMILE TRANSMl1TAL Fax ND.: See Lilt I!!owOate'flue ' £/ge:;z. H-Z i'rojtct
No. 01-2013;;9! .No.iPql:s: :L (rncludilltl Cover Sheet) TO: Reo Dimibulion List Below D URGENT X For Your Review D Please Call Upon Rcteipf D 0rigiDaI to Follow by Mail J)j!!ributloo
Lisl: CONSTRUCTION PRQGR£SS MEETING M1NU!'ES -MEETING NO. rR? Bryant Nail -Columbus Realrv TI'U§!; 972mq.j122 Mark Brandenburg -Colwnbus ReaIrv Tms!: 97Zf86§.§560 [un DuffY -Columbus
Realty Trust· 97?J770-S)47 Mm Pmo!l-Qibson §; 􀁁􀀮􀀮􀁳􀁾􀁭􀀮􀁉􀁉􀁬􀀡􀁩􀀢􀀻􀀠9721551-1552 􀁾Bawngartner & B!l!Ce ElU§ -Tgwn of Addison: 97214511-2837 Ron 1,,, -Tgwn of "ddisqn: 9721450-2134
Saad Hineidi • FU!!l'O.M!iClelland: 972f620-1328 Jmy Morgan • Co!!!!IrUc:tion M!I!!ilW!1,",1 & COMultll!!l:; WJ2JI-!342 FROM: 􀁄􀀮􀁾􀁳􀀱􀀠􀁍􀁥􀁾􀀡􀁬􀁩􀀠􀁾BY: Pula Pow"", TlMIi: .3YtJ,aa:}
DATE: C -f/-11 V_ "-"""prob/I... _Wiffg "'II F"-T_pi_ _ Mr. Jun.. WlUo ...... UwI/'UdIW 1__oJ (114) 67l-J3U. l'7Icmk }'<lOL ]JjJ McKinne}lAvlllfUe • Suite 􀁾􀁏􀁏􀀠• Da/ltL'f, Tum 15204·
(114) 871.JJIJ • FAX(1U} 871-07$1 
􀁓􀁾􀁾􀀮􀁂􀁙􀀺􀁘􀁅􀁒􀁏􀁘􀀠7033 6-4-97 3:11PM HUITT-ZOLLARS. 􀁉􀁎􀁃􀀮􀁾􀀠972 450 2837;# 21 4 . ; . .' ,,.,' \,• :;, '1 " , ! I 􀁈􀁵􀁬􀁴􀁴􀁾􀁬􀀨􀀩􀁮􀁡􀀮􀁲􀁳􀀮􀁬􀁮􀁣􀀮􀁊􀁡􀀱􀀳􀀱􀀠McKirmey
Avenue /SUit9600/l.B '051 DaHa'6. rQXU 75<04·2489/2141871-331' rFAX2141871.Q7S7 CONSIRlJCTlON PROGRESS MEETINGNQ. 2'1 Addison Circle Phase I Public Infl'llSlrUcture June 4,1997 Pagel
PRElibNT: See AIIachcd List LOCA'1l0N: Columbu. Realty Project Tmiler 1!:3U a.m, [}ISCllSSIONS I. A cJlllllge <mler price for .llethal", ._ sisn )Xl.1s and mounlinr,; 􀁊􀁷􀁤􀁷􀁡􀁲􀁾􀀠hils
not yet been submitted by Gibson. A price should be submitted in the near future. 2. Modern Roundabout will bu uplmed alons with Addison Cin;le wben stred is cleared ofall debris and
conslnlcU"" material.. Columb ... has scheduled to sweep the _Ison Thursday of this week. 3. Signallntcreonnecl i. still on hold awailing decision from the Town. 4. Gibson llOW has direction
!"wmllie Town (m lite location ufthe irrigatilln controller ill !he pnrk. 5. Lone Stnr and SWBT lines on private property ju..\ east or Julian 011 the SOIlth side of Addison Cirtllc
are buing addressed by tbe Town. 6. Bolts ror BCgII style poles will be mlldc available 01""" II d.:cil!ion i. reached on the pole and fixture. Be"", will 01." make 􀁡􀁶􀁡􀁩􀁬􀁡􀁨􀁬􀁾􀀠a
metal template Ihr Ih. oolt patterns. 7. Town expects linkage between Buildillg • B' garage and Building' A' 10 be complete fur safe pedestrian passage prior tu obtaining C.O. Mr. Baumgartner
W<lUld like 10 SCI: the link cOmpletely bricked with no tripping hazards. The Town would except the next priority to be 􀁉􀁨􀁾􀀠completion ofsidewalks along !he north sidc ofAddl"""
Cirolc. 􀁾􀁉􀁯􀁮􀁧!he east .ide ofBosque Pack and !hen Wilt Place. 8, TUb should be £01lt.ack;d aoouL gtrtting power 10 lhe30 foot streetlight on the NW quadrant (lethe mun.:iaOOlll
They also need to inslall !he white go,,,,,,"eck on tile north side ofAddi.,,,n Circle jus, west of the roundabout [ canlacled (Jeorge E"queda (1jicr /he meeting and he will .<ull".ir
lhe W(l!"k orders la complete the above 􀁭􀁾􀁬􀁉􀁉􀁩􀀢􀀬􀁲􀁥􀁤􀀠wtR'k 9. The two exi.ting tree.. nearest the railroad !:racks on \be north side will bu removed. tolIowed by tile n"""OIlnry
grading work in the medinn !hen tile planting of!lew tlellS when !hey are available. JO. Columbus is scheduled to lIet new bacl.flow 􀁰􀀧􀁾􀁶􀁾􀁮􀁴􀁩􀁯􀁮tests and rtlJX>rts today. 11.
Tlle Town wants a submittal from Gibson on !he method and materials !hut will be used to repair some dallUlged edges on Wilt Mews drop 􀁳􀁬􀁡􀁢􀁾􀀮􀀠
HUITT-ZOLLARS, 􀁉􀁎􀁃􀀮􀁾􀀠372 450 2837;# 31 4lENT. BY; XEROX 7033 6-4-37 3;11PM CONSTRIICI'ION PROQRFSS MBEIlNG NO 22 Addison Circle Phase I Public lnftastruct\lfC June 4, 19'17 Page
2 12. The 11m constructiOIl meeting wUl be held on. Wednesday. June 15th at 8:30 aom. in Ihe project con<tnwtion trailer. END OF MEETING This report is asswllcd 10 be It true and accurate
llCCOunt ofthis meeting unl_ written notification to the COlitrary is received within Ihree (3) days. Plense distribnte these meeting 􀁭􀁩􀁮􀁵􀁬􀁥􀀮􀁾􀀠to the approprialll petI!Onnel
within your respective companies. SUBMITTED BY; HUITr-7.o1 ,I.ARS, INC. 􀀥􀁾􀁾􀁾􀀠cc; Bryant Nail, Mark Brandenburg, Jim DuffY-Columbus Realty Trust Mark l'et'S(ln·Gibson & As._iatcs,
Inc. John Baurngartnl!!", Bruce Ellis, Ron Lee-Towli of Addison Saad Hineidi.l'ugro-McClelllmd, Inc, Jerry M<JIllM·Construction Mallagement & COllsulting 
; 6-4-97 ; 3:12rM; HUITT-ZOLlARS. 􀁉􀁎􀁃􀀮􀁾􀀠972 450 2837;# 41 4SENT BY:XEROX 7033 SIGN-IN SHERI CONSTRHCTION PROGRFSS MEETING NO. 22 PROJECT; ADDISON CIRCLE PHASE I ptffiUC lNFBASTRUCIURE
DATE: 6IJIgz 8;3Q A M, NAME COMPANY TEI.l;WHONElFAX NOS /fotrr -􀀲􀀹􀁾􀀬I"C. 1.14 91Vgl(k,14-81I<J?!N &rIJ#,j .f /lsf#l. I./t-f].;J .. $'S 7.. II" f /".1. S􀁾􀀱􀂷􀀠􀀬􀁾􀂷􀁓􀀠􀁾􀀠i 􀀱􀀱􀁫􀁾􀁾􀁾􀀲􀁘􀀿�
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PUBLIC WOltKS DEPAltTMENT (972) 450·2871 Post Office Box 14tt. Addison, Texas. 7;)001 16801 Westgmw June 3, 1997 Ms. Lisa Kissel Fults Realty Corporation 14651 Dallas Parkway, Suite
101 Dallas, Texas 75240 Re: South Quorum Development Status Dear Ms. Kissel: The Town of Addison is continuing the planning process to provide another route of access to the developments
south of Quorum and Landmark Drive. The proposed roadway will connect to Inwood Road and Landmark Drive. Currently access can only be made from Dallas Parkway. This letter describes
the process that the Town is currently under going in order to expedite the project. The Town of Addison is working with Parsons Transportation Group to select the optimum road alignment
that will best serve the existing and proposed developments in the south Quorum area. At this time, three alignment alternatives have been developed. Alternate 2 is currently the preferred
alignment since it provides the most efficient connection to Inwood Road. (l have included copies for each alignment alternative.) There are still a number of engineering design questions
that need to be addressed for each altemative. The Town must reach various agreements with TU Electric, Union Pacific Railroad and the owners of the motor bank before any of the alignments
can be constructed. The Town of Addison has committed to invest 1.4 million dollars into the road system. At this time it is too early to determine the actual cost of the project, however,
it is likely the cost to construct the road will exceed 1.4 million dollars. As the design process continues we will be able to estimate the probable construction cost of the project
and need for private participation by the land owners. We will keep the affected land owners informed of any financial needs that may arise to construct the project We are hopeful that
the final alignment will be selected in September, which will allow for the acquisition of the right"of-way from the necessary properties. I hope that this letter provides enough information
to understand the process that the Town is currently going through in order to improve access to the Princeton. If you have any additional questions please call me at (972) 450·2860.
Sincerely, 􀁱􀀷􀀱􀀷􀁾􀁾􀁾􀀾􀀠 Jefh.{arkiewicz C Project Manager _. cc: John Baumgartner Ron Whitehead 
JUN-05-1997 09:26 BROCKETTE-DAVIS-DRRKE.INC 214+824+7054 P.01 􀀨􀁾􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀁆􀀭􀁁􀀭􀀭􀁘􀀭􀀭􀁔􀀭􀁒􀀭􀀭􀁁􀀭􀁎􀀭􀁓􀀭􀀭􀁍􀀭􀁉􀀭􀁓􀀭􀁓􀀭􀀭􀁉􀀭􀁏􀀭􀁎􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀁾􀀧􀀠
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RfC'D MAY 1 4 1997 OIRROILTON May 13, 1997 Mr. John Baumgartner, City Engineer Town ofAddison P.O. Box 144 Addison, Texas 75001 Re: Lot 1, Block A, Beltwood North Phase 1 Dear Mr. Baumgartner:
We have cOmpleted the review ofthe proposed improvements for the above referenced project dated May 12, 1997 prepared by PCC Consulting Engineers, Inc. Based on our review, the proposed
drainage improvements appear to be in compliance with the agreed upon requirements between the City of Carrollton and the Town ofAddison. We sincerely appreciate the opportunity to review
proposed plans that could impact the City ofCarrollton. Ifyou have any questions, please contact me at (972) 466-3200. Sincerely, 􀁌􀁾􀀠􀁶􀁊􀁾􀁥Evans, P.E. Division ManagerlDesign cc:
File Tim Tumulty, City Engineer Sepehr Parman 1120 Empire Central Place Suite 308 Dallas, Texas 75247 ENGINEERING • 1945 E. Jackson Road. P.O. Box 110535 • Carrollton, Texas 75011-0535
.972/466-3200. Fax: 972/466-3193 
, , PUBLIC WORKS DEPARTMENT (972) 450-2871 P(Jst Office Box 144 Addison, Texlls 75001 16801 West,grove MEMORANDUM To: John Baumgartner From: Robin Jones Date: May 7,1997 Subject: Traffic
Signal Problem -Letter from Sondra Voto I reviewed the letter addressed to Ron Whitehead from Sondra Voto dated April 22, 1997, Since the intersection in question (Dallas ParkwayIKellers
Springs Road) is in the City ofDallas, I called Ms, Voto for clarification of her complaint prior to contacting the City of Dallas Transportation Department Ms, Voto explained that her
complaint was actually with the operation of the signal at Keller Springs Road and Noell Trail not Keller Springs and Dallas Parkway, She also explained that for the past week and a
halfthe signal had been working much better. I suggested to her that because this traffic signal was a relatively new installation, that the City ofDallas probably had been in the process
of fine tuning its operation I told Ms, Voto that I would contact the City of Dallas Transportation Department regarding her complaint and communicate her desire to see that this signal
continues to function properly, I also gave Ms, Voto the Transportation Department phone numbers in case she has any future problems with this or any other City ofDallas traffic signaL
She was very appreciative, 
REC'ij MAY 071991􀁾􀀠April 22, 1997 Ron Whitehead Town of Addison P.O. Box 144 Addison, Texas 75001 RECEIVED APR 291997 ASS!. TO lHE CITY MANAGER ,_.. """';0:-;::,E=C=EI"-V-:" . I APR
2 5 1997J '. CITY 􀁍􀁁􀁎􀀬􀁾􀁇􀁅􀁒􀀠 Dear Mr. Whitehead: I just spoke with Andy at the City Hall ofAddison and was questioning him on whom I could send this letter to voicing my complaint
about the traffic lights at DallaslKeller Springs and Keller Springs/Tollway. He explained to me that the City ofDallas controls those particular lights but to feel free to let you know
my thoughts. Today is only one ofthe many days that I sat in that traffic for 15 minutes while those lights let approximately 4-5 cars through at a time. Traffic was backed up clear
back to the bridge before you even approach the sets ofapartments and condos. Every since the light at Dallas & Keller Springs was set up, it has not been synchronized. One light may
be green and letting cars through, but the other light will be red and causing a jam where the green light does no good to be green. All of this rambling may not make sense, but my nerves
are still frazzled from this morning's traffic. Again, let me stress that this is not an unusual occurrence. This is every morning. And very irritating! Please forward my complaint to
the appropriate persons. And let me know if! need to send a letter everyday to help get my point across. Thank you. Sondra J. Voto" One Nonnan Trail" Rockwall, Texas 75087 972nn·3824!un."
972/687-5816 wk. 
PUBLIC WORKS DEPARTMENT (972) 450-2271 Post Office Box 144 Addison, Texas 15001 16801 Westgrove MEMORANDUM To: John Baumgartner From' Robin Jones «:J' Date: May 7,1997 Subject: Traffic
Signal Problem -Letter from Sondra Voto I reviewed the letter addressed to Ron Whitehead from Sondra Voto dated April 22, 1997. Since the intersection in question (Dallas ParkwayIKellers
Springs Road) is in the City of Dallas, I caJJed Ms. Voto for clarification of her complaint prior to contacting the City of Dallas Transportation Department. Ms. Voto explained that
her complaint was actually with the operation ofthe signal at Keller Springs Road and Noell Trail not Keller Springs and Dallas Parkway. She also explained that for the past week and
a half the signal had been working much better. I suggested to her that because this traffic signal was a relatively new installation, that the City ofDallas probably had been in the
process offine tuning its operation. I told Ms. Voto that I would contact the City of Dallas Transportation Department regarding her complaint and communicate her desire to see that
this signal continues to function properly. 1 also gave Ms. Voto the Transportation Department phone numbers in case she has any future problems with this or any other City ofDallas
traffic signal. She was very appreciative. 
RECEIVED REC'D MAY 07 1997􀁾􀀠APR 2 91997 ASS!. TO THE CITY MANAGER April 22, 1997 Ron Whitehead Town ofAddison P.O. Box 144 Addison, Texas 75001 Dear Mr. Whitehead: ljust spoke with
Andy at the City Hall of Addison and was questioning him on whom I could send this letter to voicing my complaint about the traffic lights at DallaslKeller Springs and Keller SpringsfToliway.
He explained to me that the City of Dallas controls those particular lights but to feel free to let you know my thoughts. Today is only one ofthe many days that I sat in that traffic
for 15 minutes while those lights let approximately 4-5 cars through at a time. Traffic was backed up clear back to the bridge before you even approach the sets ofapartments and condos.
Every since the light at Dallas & Keller Springs was set up, it has not been synchronized. One light may be green and letting cars through, but the other light will be red and causing
a jam where the green light does no good to be green. All ofthis rambling may not make sense, but my nerves are still frazzled from this morning's traffic. Again, let me stress that
this is not an unusual occurrence. This is every morning. And very irritating! Please forward my complaint to the appropriate persons. And let me know ifI need to send a letter everyday
to help get my point across. Thank you. Sincerely, 􀁾􀁾􀀠Sondra J. Voto +One Nonnan Trail +Rockwall, Texas 75087 972n72-3824 hm. + 972/687-5816 wk. 
,, , 􀁾􀁾􀂩􀁾􀁯􀁜􀀺􀂧􀁾􀀠MAY 21991 􀁾􀀠HUITT-ZOLIARS ue I SuIte 600 /LB 105/Dallas, TeJ<aS 75204-2489/214/871-3311/FAX 214/871.{)757.. , Prepared By: Issued: Regarding: Distribution:
IMEMORANPUMOFMEEUNG I Andy Oakley, Huitt-Zollars, Inc. r/x:&-I I April 29, 1997 I ,i Addison Circle Pbase II , iHZ Project No. 01-1822-21 i Bryant Nail, Columbus Realty Trust ! ICarmen
Moran, Town ofAddison jAttendees as Noted Below I I iA meeting was held at the Town of Addison Fire Prevention Bureau on Tuesday April !29, 1997 at 10:30 AM to discuss the Fire Department's
comments on the Addison Circle Phase II Development Plan. The following persons participated in the meeting: i Andy Oakley, Huitt-Zollars, Inc. • • Mark Tuttle, RTKL Associates i !•
Gordon C. Robbins, Deputy Fire Cbief, Town ofAddison ! I The following is a summary of the discussion and conclusions. We reviewed the eight numbered comments made by Mr. Robbins during
his review of the Phase II Development Plan, a copy of which are attached for reference. 1. Street M3 will be widened to 24 feet face-to-face to allow for a legitimate fire lane as requested.
2. The private drive behind the townhomes will not be made a fire lane. It was acknowledged that the group of units meets the requirements for fire coverage from the adjacent public
streets (all parts of the building are within 150 feet of the street). 3. The entrance to the motorcourt on Building "M" does not have to be a fire lane. It was agreed that the building
perimeter is entirely within 150 feet of a frre lane and that penetration by fire vehicles into the interior is not required. L________---------_____􀁾__ Oallas I Fort WOIt.""l JHouston
I EI PasO: I Phoenix I Tustin I Ontario 
4. We will work with the Town so that their design of the park in Addison Circle (Mildred) provides an additional six feet of unobstructed passage next to the travel lanes so that there
is effectively 24 feet clear for fire vehicles. (This was discussed with Slade Strickland prior to meeting with the Fire Dept.) This may include an apron in the park that looks like
plaza or sidewalk space but is actually capable of supporting 50,000 pounds. In this way, the driving lane can remain 18 feet wide to avoid the impression of multiple lanes that is such
a problem on Westgrove. (The 18 foot width allows comfortable through movement in the presence of the angled headin parking). Huitt-Zollars needs to review the potential solutions with
appropriate City staff sufficiently to allow timely approval of the infrastructure construction plans which will precede the park design. 5. The entrance to the private garages in Building
"M" does not have to be a fire lane. It was agreed that the building perimeter is entirely within 150 feet of a fire lane and that penetration by fIre vehicles into the interior is not
required. 6. The additional fire hydrant will be installed. 7. The additional fire hydrant will be installed. 8. Acknowledged. In addition to the comments on Phase II, as submitted,
we discussed the supplemental issues surrounding Block "Q" and the office tower. Mr. Robbins reiterated that he will require a fire lane around the office tower itself but will not require
a fire lane along the south face ofthe parking garage. The foregoing represents our understanding of the conclusions reached in the meeting. Please contact me within fIve days if any
corrections are required. 
• 􀁲􀁲􀂧􀂩􀂧􀁵􀁷􀂧􀁾􀀠BU t. . J Post Office Box 144 Addl5OR.. Texas 75001 4798 Aup"rt Parkway MEMORANDUM Friday, April 04, 1997 TO: Cannen Moran, Director of Development Services FROM:
Gordon C. Robbins, Deputy Fire Chief 􀁾k-SUBJECT: Addison Circle, Pbase 2 site plan 􀁾􀁲􀀧􀀠 APR 719f1T . 􀀧􀀧􀀧􀀻􀀻􀁬􀀧􀀻􀀺􀁾􀁾􀀮􀀬􀀮􀀠. '-􀀬􀁾􀀭􀀮􀁾􀀬􀀮􀀭􀀮􀀺􀁾􀀠.. 􀁾􀀮􀀺􀀭FIREDEP
(972) 45IJ.7200 FAX (972) 45IJ.7208ADDIsoN Thank you for the opportunity to review the above submittal. I have the following comments. I. M3 shall be a properly configured and constructed
.fire lane. 2. The private drive north ofthe Block N garage (between the garage and the townhouses) shall be a properly configured and constructed fire lane, 24 feet in width. (Submittal
scales at 20 feet). 3. The entrance to the motor court on Building M shall be configured to fire lane specifications (minimum 24 feet wide and 14 feet of clear height) and shall be marked
as a fire lane. 4. The "private garage" drive ofBuilding M shall be constructed and marked as a fire lane. 5. Addison Circle where it splits around the park shall be a minimum of24-feet
in width. (Submittal scales at 20 feet). 6. A fire hydrant shall be installed on the east side ofM2 South approximately 200 feet south of the intersection ofM2 and Addison Circle. 7.
A fire hydrant shall be installed on the east side of Spectrum approximately 150 feet south ofthe intersection of Spectrum and Addison Circle. 8. It is my understanding, after meeting
with representatives from Columbus Realty Trust, that the "mini storage" portion ofBuilding 0 will be of noncombustible construction. Fire Department approval ofthe site pian is contingent
upon this. Ifthe circumstances change further review ofthe submittal will be required. Ifyou have any question, please contact me at extension 7220. 
MEMORANDUM TO: MIS Executive Action Committee From: Sheryl J. Carruth Subject: Draft ofRFP Date: June 3,1997 Below please find our comments or questions to TMG regarding the RFP draft
and their response or resolution. Please respond back as soon as possible. Note: Dates have been moved hack a week. I. Omit all references to brand names. This includes hardware and
software. Instead list performance and product criteria. The feeling is that we don't want to limit ourselves. May want to have an introductory paragraph that states we are open to other
solutions. RESOLUTION: Left brand names In places but added introductory paragraph -Pg 3. "The Town's planned quantity and/or specifications are provided for Informational purposes only.
The vendor Is expected to utilize professional expertise to provide the Town with an optimum configuration. The vendor is instructed to replace the Town's language with their proposed
specifications." Thisstatement has also been added to Pg 22 and Pg41. 2. Will vendor talk to users to determine printer and type ofPC (desktop or laptop) needs? Ofthe computers being replaced some may want
laptops instead ofdesktops. Also why get rid ofthe printers at a person's desk until it breaks down. RESPONSE: The RFP calls for 7 laptops as this is how many users currently have. TMG's
thoughts were to replace desktops with desktops and laptops with laptops. We need to decide who want's what. Laptops due cost more, so TMG's cost estimate would change somewhat. Keep
printers until they break down. 3. Question arose ofwhy replace 486 computers? RESPONSE: In order for the network to run optimally, it is recommended that pentium's be used. The 486
thE Town has are low end models with minimal procesSor and memory. Itwould cost more to upgrade the 486 than replace with pentium's. Some 486 will be used as servers, however. 4. How
will the general Govermnent System integrate with Public Safety system? RESPONSE: This is something the vendor will have to address and provide for. 5. Will the Cost sheets be available
on disk to the bidders? Need to remove the zeros and leave blanks. Provide place for breakout of operating cost and maintenance costs. Omit "Reserves and Contingencies" from the spreadsheets.
RESOLUTION: Added paragraph Pg 40. TMG did not feel that Reserves and Contingencies should be left off. This will be a taed bid so any overrun in costs the vendor will have to incur
themselves. 
6. The issue ofpayment. We don't want to pay until product is delivered. RESPONSE: TMG' feels that the issue of payment is part of contract negotiations and should not be addressed in
the RFP. 7. Year 2000. Somewhere state that all new software and hardware should be year 2000 compliant or vendor will accept responsibility of making it year 2000 compliant. Also, the
hardware andlor software that we keep can they test to see ifwe have a year 2000 problem. (I have talked to CCS and they say their software is ok due to PICK date being 5 digits, not
mm/ddlyy.) RESOLUTION: Statement added to Pg 4 stating all hardware/software will be 2000 compliant. 8. Will there be CD-ROM drives in the new computers? RESPONSE: Yes 9. How can we
provide for remote user access. RESPONSE: Huser'S have computers at home they can access through modem. MIS department can keep some laptops on reserve to issue out to users who need
to work from home. 10. ClaritY where you can get a copy ofthe Strategic Plan. RESPONSE: This will be announced at the pre-bid meeting. 11. On Pg 10 will virus software have artificial
intelligence? RESOLUTION: Reworded paragraph "Vendor will select a product that receives regular updates for detection ofcurrent and known viruses, as well as having the ability to detect
unknown viruses. 12. Public Safety platform is unknown at this time. RESOLUTION: Reworded statement on Pg 10. 13. Pg 19 Total PC's what does this number represent? RESPONSE: Total devices
that will be connected to the network. 14. Define Intranet. Will it replace something we have? RESOLUTION: Pg 18 Paragraph has been reworded "Intranet is intended to eventually be used
as the Towns groupware solutlon". In other words how we communicate and share information internally. 15. Timeline on Pg 27, does this refer to months. Also, Public Kiosks in twice.
RESOLUTION: Added "24 month schedule". Public kiosks is in two phases. Changed wording of first reference as "pilot" project. 16. Change wording on pg 31. RESOLUTION: Done. 17. Explain
pg 38 5.21. RESPONSE: For every day that the vendor does not start the project aller the stipulated start date, they will pay the town S1000 per day ofdelay. 18. On cost sheets, break
out unit costs and maintenance cost. RESOLUTION: Done. 
®. Irsan excilingtime at the TC1M1 cfAck:lison A Partnership for Development of the Town's Technology Infrastructure Proposal #: 97-19 Date Issued: FridayJune 6, 1997 Date Due: Thursday
July 3, 1997 TMG CONSULTING, INC. 
Request for Proposal Development of the Town's Technology Infrastructure TABLE OF CONTENTS 1.0 INTRODUCTION······_··_·-·---·-_·-·_··1.1 The Town ofAddoon---------------------3 1.2 Intent
of the RFP,----------------------3 1.3 Events & Dates-----'-------------------4 1.4 Contact Informatioo---------------------4 1.5 A High Technology Procurement-----------------4 2.0
WORK DEFINITION --...,----·-_..·-·-·--·---------·-----··-5 2.1 InfrastructureCompooeots-------------------5 2.2 ScopeofWork-----------------------6 2.3 ProductiooSupport---------------------19
3.0 PROPOSAL FORMAT ----••• -••--•••••••••••••• --...-.-...-.----.---.----••• 20 3.1) Executive Summary----------------------21l 3.2) VendorProfile----------------------21l 3.3) Vendor
Qualification.--------------------21l 3.4) The Solution-----------------------21 3.5) Other Vendor loformation-------------------28 4.0 PROPOSAL EVALUATION ..• --··-----..---·-··-··-··---29
4.1 SCheduleofEvcots---------------------29 4.2 Evaluation Criteria ---------------------31 5.0 TERMS AND CONDITIONS·---------·--·--------33 6.0 COST SHEETS -------·---·--·---·----···--···-··..··---·
..·-··-40 TMG Page: 2CONSULTING. INC. 
Request for Proposal Development of the Town's Technology Infrastructure 1.0 INTRODUCTION An briefsynopsis andInvitation to submitproposals The Town of Addison is located in the Dallas
North Parkway area which has been referred to as the "golden corridor" of the Dallas metroplex. Aside from the Town of Addison, the area encompasses the Dallas suburbs of Carrollton,
Farmers BranCh, and Plano. The area, which developed rapidly during the late 1970's and early 1980's is home to affluent residential neighborhoods, over 1,200 million-dollar companies,
scores of quality restaurants, and three spacious malls, including the prestigious Galleria. The area commands a central location in reference to Downtown Dallas, DFW airport, and the
Plano Corporate Campus area. Epitomizing the best features of the area is the Town of Addison. The Town places a special emphasis on quality of life which demands all development meet
the most rigorous building requirements. The result of this philosophy has made Addison a cosmopolitan "downtown-uptown" distinguished from almost any other urban area in the nation.
Although it has only 11,000 residents, the Town serves an estimated 55,000 business persons, shoppers and visitors every day. The Town's blend of residential, retail, and office uses
creates an open environment which avoids the claustrophobic effect usually associated with densely developed areas. The Town's 1997 fiscal year budget totals $49.5 million with staffing
of 232.6 fulltime equivalent position. The Town of Addison, Texas recently completed an Information Services StrategiC Plan. The plan was approved by the Town Council with permission
to proceed with the solicitation of proposals for the execution of various plan components. This Request for Proposal (RFP) is intended to solicit responses from qualified Vendors and
lmplementers for the design, installation and ongoing support of all aspects of the Town's proposed technology infrastructure. The Town is extremely interested in a single Vendor providing
a comprehensive technology solution with the intent of forming a long-term business relationship and technology partnership with the Town. The Town's planned quantity and/or specifications
were used to develop the plan and associated project budgets. They are included in this document for informational "fMG Page: 3CONSULTING. INC. 
purposes only. The vendor is expected to utilize professional expertise and recommended products provide the Town with an optimum configuration. All sofiwarelhardware proposed must be
year 2000 compliant. The following sequence of events and tentative schedule dates have been established. <:> Request for Proposal Distributed -Friday June 6, 1997 Copies of this proposal
can be obtained through the following media. Hardcopy: Clyde Johnson, C.P.M. Office of the Purchasing Manager Addison Finance Building 5350 Belt Line Rd Addison. TX 75240 Phone: 972-450-7090
<:> Pre-Proposal Conference -Friday June 20, 1997 Vendors are asked to attend a non-mandatory pre-proposal conference. Location: 9:00 a.m. to 11 ;00 a.m. Addison Conference Center 15650
Addison Road Addison. Texas 75248 <:> Vendor Proposals Due -Wednesday July 9, 1997 Proposals will be received until Wednesday July 9, 1997 at 2:00 p.m .• COT. Submit to: Office of the
Purchasing Manager Addison Finance Building 5350 Belt Line Rd Addison. Texas 75240 Please Please direct all procurement and administrative questions to Clyde Johnson the . Towns Purchasing
Manager at 972-450-7090. All other questions related to this procurement can be directed to Greg Galluzzi of TMG Consulting at 512-288-2655 or email at TMGGreg@woridnet.atlnet. The Town
of Addison has determined that the Texas Statute on "High Technology" procurement applies to this proposed purchase. The statute provides for the TMG Page: 4 CONSULTING. INC. 
acquisition of certain goods or services through the use of competitive sealed proposals rather than competitive sealed bids. 2.0 WORK DEFINITION Apresentation ofthe inftastroclure componentsandscope
ofwork The Town's Information Services Strategic Plan is based on the following: An industry concept of"Retooling the Professionaf" provides the setting for this technology blueprint.
Retooling promotes the Town's optimization and effective utilization oftechnology. It results in an increase in processing efficiencies thereby enabling Staffto continue providing the
exceptional customer service, infonnation and interaction which has become synonymous with the Town ofAddison. We strongly believe that "RetOOling the Professional" represents a critical
technology investment today which will enable the Town's future business success. We are committed to the Optimization of Technology and its use in facilitating exceptional customer
value. The plan consists of the following major components. .. CAD Park Design e fleet Servk:es Chltton Upgrades FInancial System .. Convention Center • Fuel Inventory Interface • Barcode
cash Receipt Documents • T•• Map DIgltal ConWlSions § • Padc Inventory System • brlgallon System U_. • Spa Monitoring and AutomatIOn • _Hng Management • 1'ra!IIe Signal UP\I_Groupware
Storage Application SUpportI =􀁉􀁉􀁾􀁏􀁍􀁉􀁉􀀠Internet Remote Access Presentation I COOncll Customer Ele<tronk: Request, Intranet W@] 􀁾..SUite Color Camplslnt AutomatedPublk:Mopier'
RemoteDesktop' laserBW Management KlOSlc$Notebooks Computing Response Dialog􀁾􀀠 -§] User Computtng Support Commumcation LayerI II I ;==Wl=de=.Area==N=etwo="'==!.!II==In=fr.I="tnl=e!u=re=s=_=rt=::::!
.JII==D=ls=a=lIt=er=R=e<:o=ve='Y==llj 􀁾􀁾j Integrated Vendor Evaluation & SelecUon I TMG Page: 5CONSULTING. INC. 
Within the plan, the following are considered infrastructure components within the scope of this RFP. Ili'J 1. Wide Area Network Ili'J 12. Communication Layer Ili'J 2. Infrastructure
Support Ili'J 13. Remote Computing Ili'J 3. Disaster Recovery Ili'J 14. Fax Management Ili'J 4. Desktop I Notebooks Ili'J 15. Public Kiosks Ili'J 5. Office Suite Ili'J 16. Council Electronic
Access Ili'J 6. Office E-mail Ili'J 17. Intemet Access Ili'J 7. Office Groupware Ili'J 18. Remote Presentation Ili'J 8. Mopier I Laser Printer Ili'J 19. Automated Voice Response Ili'J
9. Laser Color Printer Ili'J 20. Customer Request I Complaint Ili'J 10. CD-ROM Ili'J 21. Intranet Ili'J 11. Volume Storage Each of these components is described in more detail within
the following sections. TMG Page: 6 CONSULTING,INC. 
· ,..,1􀁉􀀻􀁾􀁖􀀧􀀧􀀧􀀧􀀠Request for Proposal ';/®. Development of the Town's Technology Infrastructure IlIi'l 2.2.1 WIDE AREA NETWORK The Town of Addison occupies 12 facilities within
4.5 square miles of Addison proper. Connectivity is required at 9 of the 12 locations as identified in the following diagram. 1. Addison Town Hall 2. Finance Building 3. Celestial Pump
Slation 4. Fire Slation #2 5. Addison Athletic Center 6. Pump station 7. Central Fire station 8. Police station 9. SelVice Center 10. Trinity Athletic Complex 11. Conference Centre 12.
Theatre Centre 4.5 square miles fil,] Requires . .. connectivity oDoes not require connectivity At this time connectivity is not required at the Celestial Pump Station (3), the Pump
Station (6), or the Trinity Athletic Complex (10). TMG Page: 7 CONSULnNG. INC. 
The following diagram identifies current access provided to the Town's locations . • r-::C.1 􀁾􀁾􀀠Service 􀁣􀁥􀁮􀁴􀁥􀁲􀁾􀀠Conference centr1ll!,.1 /-::J lilTheater Centre 􀁰􀁏􀁉􀁩􀁣􀁥􀀯􀁃􀁯􀁵􀁾􀁊􀀺􀁴
􀁪􀁬􀀠􀁾􀁾􀀭14.4S:-_"illl1il 􀁂􀁁􀁴􀀬􀁾􀀠Fire 􀁾􀀠Station "􀀮􀁾􀀠􀁾􀁉Athletics 􀁾􀀠Center 􀁾􀀠/Cable Unksys 5 port workgroup hub In addition, the Town utilizes a centrex-based telephone
system with a computerized PBX system supplied by NEG. This digital phone system supports voice at T1 speeds of 64Kbps with analog modem support at 14.4 Kbps. Service Center Theatre
Centre Conference Center Main Fire Station Fire Station #2 NEC NEAX 2000 NEC t4EAX 2000 TMG Page: 8 CONSULTING. INC. 
2.2.1.1 Network Connectivity The plan for providing future connectivity is a blending of the Town's current voice system and ifs current data system into a single integrated system supporting
vOice, data, and video. 􀁣􀁵􀁲􀁲􀁥􀁮􀁴􀁾􀀠Voice 􀁾􀀠System 11 Proposed Voice, Data, Video Voice The Town's existing digital phone system utilizes T1lines which provide an excellent medium
for VOice, data, and video. The network is planned to utilize fast Ethernet running at 100 Mbps, category 5 shielded twisted pair cable, and fast Ethernet 10/100Mb Network Interface
Cards (NICs). Theatre Centre Conference Center Service Center Main Fire Station Fire Station tI2 T164 v.bps TMG Page: 9CONSULTING. INC. 
•• 2.2.1.2 Network Servers The solution requires a minimum of two high performance network file servers running Windows NT Server 4.0 with suggested locations at the Town's Service Center
and the Finance Building. Additional network servers could be acquired and placed within other Town locations as identified by the Vendor. All servers will be accessible (security driven)
from any workstation attached to the network. 􀁑􀀡􀀩􀁾􀀬􀀮􀁩􀀺􀀧􀁾􀁬􀀮􀁾􀁴􀁥􀁲􀀠Finance 11 􀁾􀀠􀁾􀀠I1!4r IIDII . ' "􀁾􀀺􀀮􀀠􀀧􀁾􀁉􀁜􀁾􀁉􀀠􀁾􀀠' The servers will provide fault-tolerance
in the event one server becomes unavailable, users can access the network by attaching to a second server. Virus protection is essential and a product such as Intel LAN Desk Virus Protect
will allow all servers and workstations attached to the network to be monitored for virus infection. The instant a virus is detected on any network device, the management system console
is notified, the virus identified, and removed. The vendor will select a product that receives regular updates for detection of current known viruses, as well as having the ability to
detect unknown viruses. For data backup and recovery purposes the network will be equipped with a device(s) capable of baCking up any network drive including network servers and key
workstations. Backup software such as Seagate's Backup Exec Tape Backup Software will be included to provide data backup & archive management. 2.2.1.3 Application Servers The solution
requires connection of the Town's Financial Systems and the Town's new Public Safety application running on a UNIX computing platform. Financial Systems Server • Sun Sparcserver 1000E
Finance • UNIX based operating system • Unldata data base • Dual 60 MHz processors • 6 GB storage • 128 MB memory • . 64 asynchronous ports • 2 parallel ports • 644 MB CD-ROM • 14GB
Bmm internal tape drive • 1600 bpi Y, inch tape drive TMG Page: 10 CONSULTING. INC. 
The solution will connect these application servers via a Fast Ethernet card. At this time no gateways or front-end processors are planned. 2.2.1.4 Print Servers Currently the Town has
6 printers serially attached to the SUN Sparcserver 1 DDDE, 5 printers on the limited network at Town Hall, 11 printers on various print share devices, and 45 printers directly attached
to individual PC's. At a minimum the solution must accommodate continued use of these printers. .. Print Server • The solution may utilize older PC's as departmental print servers attached
to the network. • The solution may utilize a print server attached to the 􀁅􀁾􀁎􀁥􀁴􀀠Hub within each department acting as a dedicated print server running software such as 􀁐􀁓􀁾􀁒􀁖􀁅􀁒􀀮􀁅􀁘􀁅􀀮􀀠
(maximum 7 attached to a E-Net Hub). @High Speed QualitY Printing • The solution will utilize devices such as jet direct cards to attach new high speed laser printers to the network.
tD Workstation Printing • The solution will utilize specific workstations to directly attach existing printers. Workstations will have printers directly attached running software such
as a memory resident executable called RPRINTER.EXE which allows connection to the Departmental Print Server. (maximum 16 workstations attached per print server). II\il 2.2.2 INFRASTRUCTURE
SUPPORT The plan indicates the need for an internal support infrastructure in addition to external vendor support offerings. The planned Information Services organizational structure
is presented in the follOwing diagram. This department will: • Provide a single point of contact for recording, tracking and coordinating problem resolution. TMG Page: 11 CONSULTING,INC.

• Responsible for the establishment and maintenance of the Town's Technology Infrastructure. • Responsible for providing asset management and support services for the standardized desktop
environment. • Responsible for management & support of the network. • Responsible for coordination of all technology training & education. • Coordination with Vendors across all aspects
of the technology erlvironment. ... PC Applications ... PC Vendors ... Help Desk Training & Education Financial Systems ... NetworK Infr-.,cture ... 􀁁􀁰􀁰􀁬􀁩􀁣􀁾􀁯􀁮􀀠Support ... All
technology aspecls ... Desktop Technology -'> Technqlogy Support ... Disaster Recovery ... Asset Management Potential increase in staffing The solution will provide help desk software
such as Intel LAN Desk Response and will provide appropriate training and education courses for IS personnel. II\i'I 2.2.3 DISASTER RECOVERY The solution will provide for a secondary
recovery site to facilitate Town operations in the event of catastrophe and associated recovery activities. The plan is flexible in how this function is provided. II\i'I 2.2.4 DESKTOP
I NOTEBOOKS The solution requires the replacement of 10 terminals, 13386 computers, 1 MAC, and 28 486 computers resulting in a total of 52 new desktop computing devices. The Town will
retain it's 18 Pentium computers. The solution will retain the best of these computers to be used as print servers, network management consoles, etc. TMG Page; 12 CONSULnNG. INC. 
Mill v, 􀁾􀀮􀀠Request for Proposal􀁾􀁾􀀠e. I>we_ 'f""Town', T.,"n,'"", '''''"'''''''"'' Of the 52 new computers a total of 45 workstations are being requested, For planning purposes
the following configuration was utilized: o Processor: PentiumPro 200M Hz, 32MB, 2.1GB, o Windows 95197 o Monitor: 17" (15" view) o Ethemet card/Patch cable o Warranty: 3 year o Surge
Protection of the 52 new computers a total of 7 notebooks are being requested, For planning purposes the following configuration was utilized: o Processor: Pentium 150MHz, 32MB, 12.1Active,
2.1GB o Windows 95197 o Network Card: Docking station Ethemet o Warranty: 3 year o Carrying Case o Surge Protection Connectivity The workstations will utilize the existing Wintegrate
emulation software from Unidata or similar software such as Reflections, Attachmate, Rumba, or Elite providing desktop access to the Financial Server and other servers as required (including
the public safety server). Workstations will require a fast Ethernet network interface card which will terminate into an Ethernet hub providing access to the network and associated devices.
Operating System Standardization on the Windows 95·97 operating system providing 32-bit processing and integration with MS Windows NT Server 4.0. The desktop configuration will be powerful
enough to support a decision to run Windows NT on the desktop .. IfliII 2.2.5 OFFICE SUITE The solution will include the Microsoft Office 97 standard desktop. IfliII 2.2.6 OFFICE E-MAIL
The solution will promote a Microsoft E-mail solution through Outlook 97. Il'ii'l 2.2.7 OFFICE GROUPWARE The solution should address the use of groupware, also known as workgroup computing
or collaborative computing. The solution defines groupware as software targeted at supporting and facilitating a team or several teams in conducting unstructured or structured activities
in pursuit of a common goal or objective. TMG Page: 13CONSULTING. INC. 
. Mi,1liAV'''' Request for Proposal ';/®. Development of the Town's Technology Infrastructure The rapid growth of the Intemet and Intranets has further Clouded the definition of groupware
and increased the number of solutions. It is clear that today's groupware products are mOving toward complete Web integration. The Town is aware that Industry experts caution on spending
a lot of money implementing a groupware strategy which may shortly become obsolete. As a result. the solution will utilize the existing features of Microsoft Office 97 and Outlook 97.
In addition, the Town is looking toward using MS Team Manager 97 to supplement project management needs across functional departments. II.\i'l 2.2.8 MOPIER I LASER PRINTERS HP Colof
HP 5Msi 24ppm !-IP 512ppm The solution will provide 10 new high speed quality laser printers (Service Center 2, Main Fire Station 1, Police Station 2, Athletic Center 1, Conference Center
1, Finance 2, Town Hall 1). And 2 new moderate speed quality laser (Theatre Center 1, Fire Station #2 1). ., Wotb like 11: copierExisting • Worb like a printer 􀁃􀀺􀀻􀀺􀀺􀀡􀁾􀀠Serial
Printers Server The solution will provide 2 "Mopier" type devices which combine network printing and copying into a single machine. The solution will provide connection of the 6 existing
serial printers to the network. The solution will provide connection of up to 61 existing dot matrix, laser, and various printers to the network. II.\i'l 2.2.9 LAsER COLOR PRINTERS The
solution will provide 7 new laser color printers. II.\i'l 2.2.10 CD-ROM The solution supports the utilization of any CD-ROM device across the network through software such as CDNet Plus
v6.0. This predudes numerous user requests to mount specific CD's, and promotes sharing and access of CD specific information. TMG Page: 14CONSULnNG.INC. 
􀁉􀁾􀀠2.2.11 VOLUMESTORAGE The solution supports the utilization of document imaging and optical storage capability allowing for the capture, categorization, labeling and storing of
volumes of information. Optical Jukebox 􀁾􀀠& CD-ROM 􀁾Optical Server Scanning Workstations Retrieval Workstation Network Server A significant effort may be associated with backfile
conversion of paper documents to optical storage. 􀁉􀁾􀀠2.2.12 COMMUNICATION LAVER The solution will utilize a communication server to facilitate inbound and outbound communication related
to facsimile transmission, Internet access, and remote computing. Fax Transmission.. .. ...ntemet 􀁔􀁲􀁡􀁮􀁳􀁭􀁩􀁓􀁓􀁩􀁏􀁾􀀠Modem BanI< Communications adapters such as Ihose made by
DigiBoard will be installed and phone lines attached. I􀁾􀀠2,2.13 REMOTE COMPUTING The solution will provide remote computing connectivity through the communication server as the primary
method, and secondarily through direct PC access. TMG Page: 15CONSULTING. INC. 
Request for Proposal Development of the Town's Technology Infrastructure II The user can become a node on 􀁾􀁥􀁮􀁾􀁎􀁯􀁲􀁾􀀭􀁾􀁾􀀭􀀭􀀭􀀭􀀭􀀭􀀢􀀠Modem Bank Communication Server with Remote
• Connect Software III The user can take conlrol of their workstation '" Access E-mail .. Access Applications .. Access'OffICe Prod ucts' from a remote 􀀧􀁩􀁓􀁾􀁾􀁾􀀠 location using
'" Reachollt. Occasionally it will be necessary for a specific user to have the ability to take control of their desktop PC from a remote location. The solution for this access involves
loading software and installing a modem on the local and remote PC's. Once a connection is established an individual has the ability of taking control of their PC at the office. Security
is adhered to when the dial-back feature is implemented. 1l\i'J 2.2.14 FAX MANAGEMENT The solution will provide for the utilization of the communication server and the implementation
of fax management software. Communication Server 􀁷􀁩􀁾􀀠Fax Management Software • Notified by e-e-mail or network broadcast Fax management capabilities will allow users to send faxes
from any network attached workstation, route received faxes directly to users, e-mail boxes, or network printers, support fax on demand and fax broadcast. TMG Page: 16 CONSULnNG. INC.

Ifii'I 2.2.15 PUBUC KIOSKS The solution will provide for the installation of public kiosks with connectivity via telephone dial-up through the communication server. Conference Center
Communication Server with Remote Connect Software Modem Bank Service Center The solution willimp/ement workstations for public access in designated Town facilities with network connectivity.
Illil 2.2.16 COUNCIL ELECTRONIC ACCESS Network Server III Information The solution will include wiring of the Council chambers and the purchase of an additional 7 notebOOk computers
with appropriate software to facilitate remote communication for Town Council members (not included in the earlier count of 52 workstations). Ifii'I 2.2.17 INTERNET ACCESS Internet communication
consists of Internet Access and Web Site Hosting. • Internet Access • The solution will establish accounts with an Internet Service Provider. • The solution will Initially provide connection
using the Town's communication server running top speed modems. If this becomes insufficient or inefficient the Town will need to modify either the connection method and/or the speed.
• Given eanier recommendations regarding the use of Microsoft products it would make sense to pursue MS Internet Explorer as the desktop standard. However, Netscape Navigator would be
more than acceptable as an alternative browser. TMG Page: 17 CONSULnNG.INc. 
Request for Proposal Development of the Town's Technology Infrastructure • Web Site Hosting • The solution will utilize an organization interested in hosting the Town's web site. • The
Town will remain responsible for managing web content and populating the site. • At some point the Town may decide to implement a web server to host the site. I[liII 2.2.18 REMOTE PRESENTATION
The solution will include remote presentation hardware such as the EPSON Powerlight 5000 LCD Projection Unit, mobile speakers, and a remote control device.' I[liII 2.2.19 AUTOMATEO VOICE
RESPONSE The solution will provide for the installation of an Automated Voice Response capability in support of customer inquiries into account information, permit status, etc., and
routing to appropriate department and/or person. Permitting & Building Inspections Incoming Customer Information AVR Town of Addison Network Finance -Tax and Billing I[liII 2.2.20 CUSTOMER
REQUEST I COMPLAINT The solution will indude the purchase of a server based Citizen Request & Complaint Tracking software package. TMG Page: 18 CONSULTlNG,INC. 
The solution will promote an eventual Intranet capability through a Web server configured on the Town's network with appropriate security devices. The Intranet is intended to eventually
be used as the Towns groupware solution. For purposes of this proposal the following locations and device counts will be utilized. Cabling is required at all locations. For proposal
purposes all other devices such as CD-ROM servers, volume storage devices, communication server, etc., will be located within the Finance Building. The solution will include build out
and wiring of the current computing room as required to house additional servers and network communication equipment. The network will be required to support approximately 200 attached
devices across all of the infrastructure components. The solution will contain sufficient vendor resources to fully support the Town during startup activities and the first year of operation.
This support is intended to facilitate the Town's IS technical support resources and to assist the Town's users in overcoming the learning curve typically associated with the utifization
of any new technology. The Vendor must understand that training and support are very important to the Town and are viewed as Critical to the success of this effort. TMGPage: 19 CONSULTING. INC. 
V'" Request for Proposal~. tM,®!. ______Development of the Town's Technology Infrastructure 3.0 PROPOSAL FORMAT The Vendor will define the capabilities of its organization to supply
and maintain the hardware and software and provide the services as outlined within this RFP. The response should be prepared in a simple and straight-forward manner. The Vendor will
provide one (1) original and nine (9) copies to the location specified within this RFP on or before the closing data and time for receipt of proposals. The Vendor will segment their
proposal into the following sections. The Vendor will provide im Executive Summary which presents in brief, concise terms, a summary level description of the contents of the Proposal.
TheVendorwill detail all exceptions to the exact requirements imposed by this RFP. The Vendor will indicate the proposal is firm for one-hundred and eighty (180) days after the due date
for receipt of proposals or receipt of the last best and final offer submitted. The Vendor will indicate the primary company assuming overall responsibility for successful completion
of the project. In addition, the Vendor will indicate aU other companies who will be providing products or services through a subcontrecting arrangement with the Vendor or through a
separate contract to be negotiated with the Town. It is important to recognize the TOwn is looking for a Single Vendor to assume primary responsibility for the successful implementation
of the proposed solution from contract signing through formal acceptance of the infrastructure by the Town. Vendor profile information will include such items as: the year established,
business organization, office locations, financial history, nature of business, strategiC direction, industry specialties, software products, hardware products, number of . employees,
number of client installations, outstanding litigation, and authorized negotiator(s}. The Vendor must demonstrate a proven track record in providing reliable technology solutions across
a series of successful installation efforts. TMG Page: 20 CONSULTING. INC. 
The Vendor's record will reflect experience within a similar environment and of a similar nature and magnitude to that being proposed to the Town. Relevant experience must be associated
with projects completed not more than three (3) years prior to the date of this RFP. The Vendor will provide a customer reference listing and related contact infonnation for a minimum
of five (5) customers for which the Vendor has completed a similar effort. The Vendor is asked to provide a comprehensive list of customers for review by the Town. The Town recognizes
that the implementation of an extensive technology infrastructure is a complex effort and that not all possible variables are provided for within this RFP document. Therefore, it is
acknowiedged that the Vendor may be required to make assumptions regarding the Town's environment or specific requirements. Any assumptions made by the Vendor in regard to this RFP should
be documented in-line with the response. Additional detailed review and design activities will take place with the Vendor finalist to refine elements of the proposal, prior to contract
negotiation and approval. 3.4.1) THE PROJECT ApPROACH The vendor will present its methodology and approach to completing this project. Each major activity will be identified, discussed
and project deliverables identified. 3.4.2) THE TECHNOLOGY COMPONENTS The Vendor will segment their solution into the technology components described in the scope of work, and presented
in the following paragraphs. Il\iIl 3.4.2.1 W10EAREANElWORK The Vendor will present their proposal for the Town's network. Items may include: .. Network servers .. A UPS unit for each
network server. .. A backup system for network drives including servers and key workstations. .. A network operating system, Windows NT 4.0 is planned .. A network management software
product to supplement Windows NT 4.0 .. Support services for the servers with priority onsite 3 year service. .. Network equipment e.g. T1 DSU/CSU's, Routers, HP AdvancStack Hubs. ..
Category 5 cabling will be required across all Town locations with associated patch cords, racks and terminators. .. Network detailed design services. .. Network installation services.
TMG Page: 21 CONSULTING. INC. 
,. Cabling services. Illi'I 3.4.2.2 INFRASTRUCTURE SUPPORT The Vendor will present their proposal for equipping and developing the Town's IS staff. Items may include: ,. Help desk software.
,. Various server and network training for 3 IS staff members. Jlli'I 3.4.2.3 DISASTER RECOVERY The Vendor will present their proposal for providing the Town with an effective Disaster
Recovery method. Items may include: ,. An initial service to establish the disaster recovery site, recovery plan, and readiness. ,. Annual services to be provided. Jlli'I 3.4.2.4 DESKTOP
I NOTEBOOKS J The Vendor will present their proposal for the Town's desktop. Items may include: ,. Purchase and connectivity of 45 new desktop computers. ,. Purchase and connectivity
of 7 new notebook computers. ,. Connectivity for 18 existing Pentium computers. ,. Connectivity for 53 existing computers. ,. Installation services for new computers. ,. Installation
services for existing computers. ,. Required networ\<. client licenses. ,. Required desktop operating system licenses. ,. Required emulation software to access UNIX and Windows NT environments.
Jlli'I 3.4.2.5 OFFICE SUITE The Vendor will present their proposal for Town's desktop office suite software. The following is provided for informational purposes only. The vendor is
expected to utilize professional expertise to provide the Town with an optimum configuration. The Items may include: ,. Purchase and installation MS Office 97 Pro with licensing to accommodate
123 computers (provide the most cost effective yet realistiC licensing). ,. Provide basic PC training and introduction classes to MS Word and MS Excel for 123 individuals. ,. Installation
services (may combine with the desktop delivery and installation). TMG Page: 22 CONSULnNG.INC. 
V' P Request for Proposal 􀀯􀀮􀁴􀁦􀀬􀂮􀀡􀀬􀀠______Development of the Town's Technology Infrastructure 􀁾1!li'I 3.4.2.6 OFFICE E-MAIL The Vendor will present their proposal for the Town's
E-Mail solution. Item's may include: .. Microsoft (exchange) Server licensing. .. Assume using Outlook 97 on the client desktop. .. Provide basic E-Mail training classes for 120 individuals.
.. Installation services (may be part of the desktop installation). 1!li'I 3.4.2.7 OFFICE GROUPWARE J The Vendor will present their proposal for the Town's Groupware solution. Items
may include: .. Microsoft Team Manager 97 licensing to accommodate 123 computers (prOvide the most cost effective yet realistic licensing). .. Provide basic MS Team Manager 97 training
classes for 123 individuals. .. Installation services (will not be part of day one installation). 1!li'I 3.4.2.8 MOPIER I LASER PRINTER The Vendor will present their proposal for the
Town's Mopier/Laser Printer solution. Items may include: .. Purchase of 2 Mopiers .. Purchase of 10 Laser 8fW printers 24ppm 600x60Odpi minimum .. Purchase of 2 Laser 8fW printers 12ppm
600)(600 dpi minimum .. Installation services 1!li'I 3.4.2.9 LASER COLOR PRINTERS The Vendor will present their proposal for the Town's Color Laser Printer solution. Items may include:
.. Purchase of 7 Color printers (vendor to recommend laser vs. Inkjet vs. other) .. Installation services 1!li'I 3.4.2.10 CD-ROM The Vendor will present their proposal for the Town's
networked CD-ROM solution. Items may include: .. A network attached CD-ROM server TMG Page: 23 CONSULTING. INC. 
.. A CD-ROM Tower .. CD-ROM software .. Installation services .. Support services for the server with priority onsite 3 year service. .. Training services for 1 person on the operation
and maintenance of the CD-ROM equipment It\i'I 3.4.2.11 V<;lLUME STORAGE The Vendor will present their proposal for the Town's volume storage solution. Items may include: .. An optical
server. .. An optical jukebox. .. A scanning station . .. A scanner. .. Installation services. .. Support services for the server with priority onsite 3 year service. .. Training services
for 1 person on the operation and maintenance of the Volume Storage equipment. It\i'I 3.4.2.12 COMMUNICATION LAVER The Vendor will present their proposal for the Town's communication
system. Items may include: .. A network attached communication server. .. A network operating system license . .. A UPS unit. .. Fax modems (24 units at 33.6 MHz minimum). .. Connectivity
hardware (e.g. Digiboards). .. Virus Protection Software. .. Support services for the server with priority onsile 3 year service. .. Installation services. .. Training services for 1
person on the operation and maintenance of the Communication Server equipment. It\i'I 3.4.2.13 REMOTE COMPUTING The Vendor will present their proposal for the Town's remote computing
solution. Items may include: TMG Page: 24 CONSULTING. INe. 
... Access software allowing a remote user to become a network computer (e.g. WinFramefAccess). Allow for 7 laptop users. ... Access software allowing a remote user to take control of
their network computer (e.g. Reachout). Allow for 7 laptop users. ... Installation services. ... Training services for 7 people on the use of remote access software. Illi'l 3.4.2.14
FAX MANAGEMENT The Vendor will present their proposal for the Town's fax management solution. Items may include: ... Fax management software (e.g. WinPortfFaxPort Network Software 50
user license) ... Installation services. , ... Training services for 120 people on the use of fax management software. Illi'l 3.4.2.15 PUBLIC KIOSKS The Vendor will present their proposal
for the Town's public kiosk solution. Items may include: ... Purchase and configuration of 2 preconfigured modular Kiosk station. ... Installation services. ... Purchase and configuration
of 2 workstations including hardWare and software, ... Installation services ... Training services for 1 person on the operation and support of the Kiosks both the preconfigured and
the workstation. Illi'l 3.4.2.16 COUNCIL ELECTRONIC ACCESS The Vendor will present their proposal for enabling Town Councils electronic access. Items may include: ... Purchase of 7 new
notebook computers ... Purchase of 7 licenses for all required software ... Installation services ... Training services for 7 persons !1liJ 3.4.2.17 INTERNET ACCESS The Vendor will present
their proposal for the Town's Intemet access solution. Items may include: ... Internet browser licensing TMG Page: 25CONSULTING. INC. I 
.. Internet service provider accounts (20 accounts to begin with) Illi'l 3.4.2.18 REMoTIi:. PRESENTATION The Vendor will Jlresent their proposal for the Town's remote presentation solution.
Items may include: .. Mobile LCD projection equipment (1 unit) .. Mobile speakers .. Remote control unit Illi'l 3.4.2.19 AUTOMATED VOICE RESPONSE The Vendor will present their proposal
for the Town's automated voice response solution. Items may include: .. An AVR solution to support 3 line customer call-in capability .. Support services for the servers with priority
onsite 3 year service. .. Installation services. .. Training services Illi'l 3.4.2.20 CUSTOMER REQUEST I COMPLAINT SOFTWARE The Vendor will present their proposal for the Town's customer
request and complaint tracking software solution. Items may include: .. Software purchase. .. Installation services . .. Training services. Illi'l 3.4.2.21 INTRANET The Vendor will present
their proposal for the Town's Intranet solution. Items may include: ... Intranet Server Server .. Network Operating System .. UPS .. Firewall and software .. Web AuthOring Software ..
Support services for the servers with priority on site 3 year service. .. Installation services .. Training services TMG Page: 26 CONSULTING. INC. 
Request for Proposal Development of the Town's Technology Infrastructure 3.4.3) ONGOING SUPPORT The Vendor will desclibe the approach to providing ongoing operation, support and maintenance
across the installed infrastructure components. The Vendor is expected to present standard and extended service offerings. The Vendor will specifically address the support to be provided
during the first year of operation. 3.4.4) SOWTlON TIMEUNE The Vendor will include an implementation schedule detailing major project activities and technology components across a proposed
timefine. Activities should begin at . the point of contract award through final user acceptance. The Town has identified a tentative 24 month schedule for the installation of each infrastructure
component which is presented in the following diagram. 1 2 13 4 5 16 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 A Town Web II •Customer ..t..CotlJl.Cil .... Cust;)'ftl« Dialog
A."", Tracking I I ..t..WidcArea AComm. I AAVRNetwork S""... 1>.Disaste< .6F"" "'Public At.Public _ov M; , J(iosks Pilot Kiosks "'D..JdopPCs .&Rentat IA.hltranet A l\fopier! P=eu, Iiw
A.lnlegrated ..t.. LaserCoior . Vendor Sdcdion .. om(.¢" Suile .Volum "'CD· .. OtrlCC 􀀦􀁾􀀡􀀧􀀺􀀮􀀻􀁬􀀠Da" Stor... ROM Groupware Ai. USCT Computing Support : It.lntcme, I A Financial
System UpgradesAccl;SS I I I I I I .... lnfiasttuctun; Support A Other App1icaUOrts as Funded and Approved I I I I I I I I I j I The Town is expecting the Vendor to propose a timeline
which directly supports its project approach and overall solution. 3.4.5) PROJECT ORGANIZATION TMG Page: 27 CONSULnNG,lNC, 
The Vendor will provide an organizational chart and a schedule summarizing full time equivalents for Vendor Personnel and Town Personnel. The Town fully expects the Vendor to provide
the majority of project resources. 3.4.6) SOLUTION COSTING The Vendor will provide a detailed breakdown of all costs required for a successful installation of the proposed solution.
The Town encourages the Vendor to fully identify costs. To minimize or hedge on costs will only serve to place the Town and the Vendor at a disadvantage. Bundling of all costs under
a single price administered through a primary Vendor is preferred but not required by the Town. Final configuration and pricing discussions may be conducted with Vendor finalists. The
Vendor is expected to provide a payment schedule tied to specifiC milestones with a retainage of up to 25%. The payment schedule and percent retainage will dictate the need for additional
payment and performance bonds. The Town is requesting the Vendor provide specifiC cost information as outlined within the attached cost tables. These cost tables must be completed and
are mandatory to be considered responsive to the RFP. This section will include additional detail which will allow the Town to gain a greater appreciation for the proposed solution.
Any information which is considered proprietary, should be clearly marked as such. The Town will assume no obligation or liability in the event proprietary inforrnation is disclosed.
TMG Page: 28 CONSULTING. INC. 
Request for Proposal Development of the Town's Technology Infrastructure 5.0 PROPOSAL EVALUATION The Town will conduct a comprehensive, fair, and impartial evaluation of all eligible
and responsive Vendors submitting Proposals in response to this RFP. The procurement will comply with applicable Town policies. The successful Vendor will be selected by the Town based
on evaluation factors outlined in this section. The Town has established the follOWing sequence of events and tentative schedule dates for this solicitation. Friday 5.1.1 REQUEST FOR
PROPOSAL DISTRIBUTED On Friday June 6,1997 the Town will make this RFP available. Vendors may obtain copies from: Hardcopy: Clyde Johnson, C.P.M. Office of the Purchasing Manager Addison
Finance Building 5350 Belt Line Rd Addison, TX 75240 Phone: 972-450-7090 5.1.2 PRE-PROPOSAL CoNFERENCE The Town will conduct a conference with interested Vendors to answer questions
and clartfy RFP pOints. Conference attendance is not required in order for a Vendor to submit a Proposal, however, Vendors are encouraged to attend. The non·mandatory pre-proposal conference
will be conducted on Friday June 20th• Location: 9:00 a.m, to 11 :00 a.m. Addison Conference Center 15650 Addison Road Addison, Texas 75248 TMG Page: 29 CONSULTING, INC. 
V'" Request for Proposal ~~, Mt-®!, _____ Development of the Town's Technology Infrastructure 5.1.3 RFP CONTACTS Technical questions regarding this RFP should be addressed to: Greg Galluzzi
Senior Consultant TMG Consulting, Inc. 9210 Honeycomb Dr. Austin, TX 78737 Phone:512-288-2655 Fax: 512-288-2622 Email: TMGGreg@wor1dnet.att.net Administrative questions regarding this
RFP should be addressed to: Clyde Johnson, C.P.M. Office of the Purchasing Manager Addison Finance Building 5350 Belt Line Rd Addison, TX 75240 Phone: 972-450-7090 The Town will formally
respond to all oral questions posed during the pre-proposal conference and all written questions received by the Office of the Purchasing Manager prior to 5:00 p.m., Friday June 20,1997.
The Town will package its responses into an RFP addendum and distribute to all Vendors recorded by the Town as having received the RFP. 5.1.4 VENDOR PROPOSAL.S DUE Proposals must be
completely sealed, contain the Vendor's name and address and must be labeled in the lower left hand comer with the Proposal Number and Proposal Name. One (1) original and nine (9) copies
of the proposal will be received until Wednesday July 9. 1997 at 2:00 p.m. COT. Proposals received after this time will not be accepted and will be returned unopened. Submit to: Office
of the Purchasing Manager Addison Finance Building 5350 Belt Line Rd Addison, Texas 75240 Proposals will be accepted in person or by mail. Vendors are responsible for insuring their
proposals are delivered in a timely manner to the Purchasing Department. Mailing of a proposal does not insure that the proposal will be delivered on time or delivered at all. If a Vendor
does not hand deliver the proposal, it is suggested that he/she use some sort of delivery service that provides a receipt. TMG Page: 30CONSULTING. INC. 
No proposals will be accepted by oral communication, telephone, electronic mail, telegraphic transmission, or telefacsimile transmission. The Purchasing Department will record and time
stamp receipt of the proposal. A formal bid opening will not occur. The Vendor submitted proposals will be publicly opened and proposers names will be read, but no other information
will be disclosed. The contract may be awarded to the Vendor whose Proposal is determined to be the most advantageous to the Town. In rendering this decision, the following evaluation
criteria may be utilized. • 5.2.1 Solution Award Points may be awarded for the most complete, comprehensive and integrated solution. Vendors not capable of providing all of the requested
products and services will form partnerships to provide the Town with a total solution. The Town will pay close attention to the installation, training and support services associated
with the proposed solution. • 5.2.2 Vendor Award POints may be awarded based upon the Vendor's qualifications, installation experience, client references, and resource capabilities.
• 5.2.3 Technical Award Points may be awarded based upon the Vendor's overall technical strategy and individual technology component solutions. • 5.2.4 Cost Award Points may be awarded
based upon the reasonableness of the Vendors cost proposal. and the completeness, accuracy and level of cost detail provided. Cost detail must be submitted on the cost sheets provided
in this RFP. The vendor will provide a total cost and a breakdown of costs by infrastructure component. TMG Page: 31 CONSULTING. INC. 
Request for Proposal Development of the Town's Technology Infrastructure A. 5.2.5 Interview/Site Visit Award Points may be awarded based upon interviews conducted with the Vendor and/or
site visits to Vendor customer sites, A. 5.2.6 Risk Award Points may be awarded based upon proposals which minimize the risks associated with a project of this nature. The Town will
consider factors such as: number of years in business, experience level, client references, resource availability, teChnical platforms, project approach, staffing levels, training hours,
support levels and project timeline. . A. 5.2.7 Installation Award Points may be awarded based upon the Vendors proposed approach, timeline, organization structure, and staffing levels.
A. 5.2.8 Responsiveness Award Points may be awarded based upon the Vendors proposal completeness, fevel of detail, and conformance to Town instructions. The Town will utilize judgment
and common sense in identifying and selecting a Vendor solution. The award points are used to assist the Town in rendering a decision through empirical analysiS, however, the Town reserves
the right to conduct other evaluations and measurements of Vendor responses as may be required in order to render an informed and optimum decision. TMG Page: 32 CONSULTING. INC. 
Request for Proposal Development of the TO\i\If1's Technology Infrastructure 5.0 TERMS AND CONDITIONS The terms and conditions under which the Proposal will be made are detailed within
this section. The Town views this RFP as the framework to be used by the Vendor in preparing and submitting the proposal. It is important for the Vendor to become familiar with the paragraph
items within this section, as they will prevail in the event of any discrepancies or differences between project related or contractual documents. Only information supplied by the Town
in writing through the Purchasing Office should be used in the preparation of Vendor Proposals. Only replies by formal addenda shall be binding. Oral and other interpretations or clarifications
shall not be binding. Vendors must acknowledge all addenda by Signing and including such documents in the Proposal. The Vendor must submit a complete set of any additional terms and
conditions that they propose to have included in a contract negotiated with the Town. Town. Proposals shall be opened in a manner that avoids disclosure of the contents to competing
Vendors and keeps the proposals secret during negotiations. All proposals are open for public inspection after the contract award, but trade secrets and confidential information in the
proposals may not be open for public inspection. Such data must be stamped "proprietary" or "confidential" on each page on which they appear, must be readily separable from the proposal
and may be subject to review by the Attorney General of Texas in accordance with the Texas Open Records Act Vendors are advised that the confidentiality of their proposals will be protected
by the Town to the extent permitted by law. Vendors are advised to considerthe. implications of the Texas Open records Act, particularly after the proposal process has ceased, and a
contract has been awarded. While there is prOvision to protect proprietary information under section 3(9) and section 3(10) of the Act, where the vendor can meet certain evidentiary
standards, please note that a ruling on whether these standards have been met will not be determined by the Purchasing Office of the Town of Addison but by the Office of the Attomey
General of Texas. TMG Page: 33 CONSULTING. INC. 
Proposals must be returned in sufficient time so as to be received and date/time stamped at the specified location on or before the published proposal date and time specified. Any proposal
received after the time and date set for receipt of proposals is late and cannot be considered. The submission and signature of a Proposal shall indicate the intention of the Vendor
to adhere to the provisions described in this RFP. 1. Proposals which are signed for a partnership shall be signed in the firm's name by at least one partner or in the firm's name by
an attorney-in-fact. If signed by an attorney-in-fact, there should be attached to the Proposal, a Power of Attorney evidencing authority to sign Proposals, dated the same date as the
Proposal and executed in accordance with the legal requirements of the firm. 2. Proposals which are signed for a corporation shall have the correct corporate name thereon and Signature
of the president or a vice-president manually written below the corporate name. Any other signature signature must be accompanied by a resolution of the Board of Directors authorizing
such signature to contract in the company's name. The title of the office held by the person signing for the corporation shall appear below the signature of the officer. 3. Proposals
which are signed by an individual doing business under a firm name shall be signed in the name of the individual dOing business under the proper firm name. This Request for Proposal
does not commit the Town to pay any costs incurred by any Vendor in preparation and/or submission of a Proposal, or for procuring or contracting for the items to be furnished under the
RFP. All costs directly or indirectly related to responding to this RFP (including all costs incurred in supplementary documentation) will be bome by the Vendor. Each Vendor will be
responsible for all costs incurred in preparing or responding to. this RFP. The Vendor agrees to bear all risks for loss, injury, or destruction of goods and materials (ordered or supplied
as the result of the eventual contract) which might occur prior to delivery to the Town; and such loss, injury, or destruction shall not release the Vendor from any obligations under
this RFP or any resulting contract. The Vendor promises that it's officers, employees or agents will not attempt to lobby or influence a vote or recommendation related to the firm's
proposal response; TMG Page: 34 CONSULTING. INC. 
rA'􀀱􀀻􀁾􀁖􀁦􀁾􀀮􀀠Request for Proposal􀁾;:t' ®. Development of the Town's Technology Infrastructure directly or indirectly, through any contact with Town Council members or other Town
officials between the proposed submission date and award by the Town Council and that there will be non-collusion and non-conflict of interest. All documents submitted in response to
this Request for Proposal shall become the property of the Town of Addison. 􀂧􀀺􀀻􀁾􀁾􀁩􀁬􀁩􀁾􀀱􀁾􀁑􀁬􀁩􀀮􀁾􀀨􀁾􀁩􀁗􀀮􀁜􀀱􀀺􀁑􀁎􀁬􀁰􀁒􀁲􀁂􀀺􀁾􀁩􀁩􀁾􀁲􀁾􀀧􀁑􀂧􀀱􀁥􀁛􀁑􀁬􀁬􀀱􀁩􀁩􀁲􀁉􀁩􀁛􀀻􀁩􀁦􀁾􀁾􀀡􀁛�
�􀁦􀀬􀁾􀁦􀁾􀀱􀀮􀀱􀁗􀁊􀁩􀁴􀀮􀁾􀁬􀁬􀀠Vendors may be disqualified for any of the following reasons: • There is reason to believe that collusion exists among the Vendors; • The Vendor is
in arrears on an existing contract or has defaulted on a previous contract with the Town; • The Vendor lacks financial stability; • The Vendor has failed to perform under previous or
present contracts with the Town; • The Vendor has failed to use the Town's required forms; • The Vendor has failed to adhere to one or more of the proviSions established in this RFP;
• The Vendor has failed to submit its Proposal in the format specified herein; • The Vendor has failed to submit its Proposal on or before the deadline established herein; • The Vendor
has failed to adhere to generally accepted ethical and professional principles during the Proposal process; Proposals may be rejected if they show any alteration of words or figures,
additions not called for, conditional or uncalled-for alternate proposals, incomplete proposals, erasures, or irregularities of any kind, or contain any unbalanced values. Proposals
shall be considered as being "irregula," if they show any omissions, alterations of form, additions, or conditions not called for, unauthorized alternate proposals, or irregularities
of any kind. The Town reserves the right to waive minor irregularities and mandatory requirements provided that all responsive proposals failed to meet the same mandatory requirements
and the failure to do so does not othelWise materially affect the procurement. This right is at the sole discretion of the Town of Addison. TMG Page: 35 CONSULTING. INC. 
Proposals may be withdrawn by written or telegraphic notice received by the Purchasing Office prior to the exact hour and date specified for receipt of bids. A bid may also be withdrawn
in person by a bidder or his authorized representative, provided his identity is made known and he signs a receipt for the bid, but only if the withdrawal is made prior to the exact
hour and date set for the receipt of bids. 􀂧􀀮􀁾􀁾􀀺􀁧􀁝􀁾􀁍􀂧􀀧􀁾􀀡􀁩􀁴􀁾􀁾􀁾􀀡􀁦􀁴􀁾􀁾􀁾􀁑􀂧􀁁􀁾􀁛􀁾􀁾􀁩􀁩􀁬􀁬􀁩􀁬􀁩􀁬􀁬􀁾􀁾􀁩􀁾􀁛􀁾􀁭􀁭􀁾􀁾􀁦􀀺􀁾􀀡􀀡􀁬􀁭􀁬􀀺􀁩􀁦􀁬􀁩􀁬􀀺􀀺􀁩􀁩􀀻􀁲􀂷􀀺􀀻􀀡􀁭􀁭􀁾􀁩
􀁦􀁲􀁾􀁾􀁾􀁪􀁬􀁬􀁩􀁾􀁾􀁾􀁾􀁲􀀮􀁩􀁾􀁾􀁬􀁾􀀡􀀡􀀠An Vendor must submit an amended proposal before the deadline for receipt of proposals.Such amended proposals must be complete replacements of a previously submitted proposal and must be clearly identified as such in the transmittal letter. The Town will not merge, collate,
or assemble proposal materials. Responses to this RFP, including cost, will be considered firm for one-hundred and eighty (180) days after the due date for receipt of proposals or receipt
of the last best and final offer submitted. All Proposals must include a statement to that effect. 􀁾􀀺􀀻􀀧􀁾􀀡􀀱􀀡􀁾􀂣􀁾􀁾􀁂􀁲􀀬􀁩􀁑􀁩􀁾􀀡􀀡􀁭􀀡􀁂􀀺􀁴􀁪􀁾􀀡􀀱􀁴􀀻􀁴􀁾􀁾􀂧􀁾􀀡􀁅􀀴􀁾􀁩􀁲􀁩􀁑􀁾􀁩􀁾􀁭􀁭
􀁭􀀡􀁭􀁜􀁝􀁩􀁬􀀡􀁭􀁭􀀧􀁬􀀺􀀺􀁫􀀻􀀺􀁾􀁭􀁩􀀡􀁾􀀡􀀡􀁬􀁬􀁭􀁾􀁬􀁪􀁭􀁾􀁲􀁊􀁾􀁾􀀧􀁾􀁭􀀡􀁾􀁾􀁬􀁬􀀡􀁬􀀠Although the specifications stated in the RFP represent the Town's anticipated needs, there
may be instances in which it is in the Town's interest to permit exceptions to specifications and accept alternatives. It is extremely important that the Vendor make very clear where
exceptions are taken to the specifications and how the Vendor will provide alternatives. Therefore, exceptions, conditions, or qualifications to the provisions of the Town's specifications
must be clearly identified as such together with reasons for taking exception, and inserted into the Proposal. If the Vendor does not make clear that an exception is being taken, the
Town will assume the Proposal is responding to and will meet the specification as written. Where the Vendor does not agree with the Town's terms and conditions, we require the proposal
to enumerate the specific clauses which the Vendor wishes to amend or delete and suggest aHemative wording. Any minimum terms to which the Town will have to agree to in order to enter
into a contract with the Vendor and which the Vendor considers to be a "deal breaker" MUSTBE SUBMITIED WITH THE PROPOSAL. Discussions may be conducted with responsible Vendors capable
of being selected for award for the purpose of clarification to assure full understanding of, and TMG Page: 36 CONSULTING. INC. 
V' '" Request for Proposal ~~. twtf,®'. _____Development of the Town's Technology Infrastructure responsiveness to, the solicitation requirements. In conducting discussions, there shall
be no disclosure of any information derived from proposals submitted by competing Vendors. Until award of the contract is made by the Town, the right will be reseNed to reject any or
all proposals and waive technicalities, to re-advertise for new proposals, or to proceed with the work in any manner as may be considered in the best interest of the Town. The Town's
City Manager reseNesthe right, at his sole and unqualified discretion, to cancal this RFP at any time. The Town reserves the right to reject any or all proposals submitted in response
to this RFP. The Contract will be govemed by the laws of the State of Texas. All duties of both parties shall be performed in Dallas County, Texas. The applicable law for any legal dispute
ariSing out of the Contract shall be the law of the State of Texas. This procurement in no manner manner obligates the Town or any of its agencies to the eventual rental, lease, or purchase
of any software or services offered until confirmed by an executed written contract. The Town reserves the right to withhold final action on Proposal for a reasonable time, not to exceed
ninety (180) days after the date of opening proposals, and in no event will an award be made until further investigations have been made as to the responsibility of the proposed Vendor.
The award of the contract, if an award is made, will be to the most responsible and responsive Vendor whose Proposal meets the requirements and criteria set forth in the Request for
Proposal. The Town reseNes the right to abandon, without obligation to the Vendor, any part of the project or the entire project, at any time before the Vendor begins any work authorized
by the issuance of a Notice to Proceed by the Town. The award of the contract shall not become effective until the contract has been executed by the Vendor and the Town. TMG Page; 37
CONSULTING. INC. 
The ToWll Council shall authorize award of a contract to the successful Vendor and shall deSignate the successful Vendor as the Town's Vendor. The ToWll will require the Vendor to Sign
the necessary documents entering into the required Contract with the ToWll and to provide the necessary evidence of insurance as required under the contract documents. No contract for
this project may be signed by the Town without the authorization of the Addison ToWll Council. No Contact shall be binding on the Town until it has been approved as to form by the Town
Attomey, and executed by the Town's City Manager. The Vendor shall not commence work until authorized in writing to do so by the Town. Should the Vendor fail to commence work on the
project within the time stipulated in the written authorization, it is agreed that the Vendor will forfeit $1000 per scheduled vendor full-time-equivalent delayed. 􀁪􀁊􀁩􀁾􀁾􀁾􀁒􀀱􀁊􀁛􀁾􀀦􀁩􀁁􀁎􀁾􀁾�
�􀁦􀁬􀁛􀁩􀀧􀁦􀁾􀁑􀁩􀁍􀁲􀁲􀀻􀁪􀀧􀀡􀁩􀀡􀀱􀀱􀀱􀁑􀁎􀁧􀁳􀀮􀂷􀀻􀀺􀀻􀁭􀁬􀀺􀁾􀀻􀀻􀀺􀀻􀁾􀂷􀂷􀀮􀀺􀁭􀁬􀁩􀀻􀁩􀁾􀁣􀁾􀀮􀀺􀀮􀀻􀁩􀀺􀁩􀀺􀁭􀁭􀁛􀀡􀁾􀁾􀁭􀁲􀀬􀁾􀁮􀁭􀁊􀁋􀁾􀁲􀁾􀁦􀀬􀁪􀀡􀀠As a condition, precedent
to the Town's execution of a final contract, the successful Vendor may be required to provide the Town with both payment and performance bonds whose penal amount equals the total installed
purchase price of the hardware, software and services under contract. Bonding companies must be listed in the latest U.S. Treasury Department, Circular 570, be licensed in the State
of Texas, and have underwriting limitation equal to or greater than a penal sum of each bond. The Vendor shall maintain the following commercial insurance policies for the period of
time and limits specified: o Commercial General Liability Insurance with a combined bodily injury and property damage per occurrence limit of not less than $600,000. The policy shall,
at a minimum, have a $1,000,000 annual aggregate. The policy shall contain blanket contractual liability, products and completed operations coverage, and independent Vendor s coverage.
coverage. Coverage shall be endorsed to provide aggregate limits of insurance per project @Automobile Insurance Policy. The policy shall be maintained for the duration of this Agreement
at the following limits and for the coverage specified: • Liability Bodily Injury -each person $250,000, each accident $500,000; • Property Damage -each accident $100,000 (or equivalent
if written on a combined single limit basiS); TMG Page: 38 CONSULTING. INC. 
Request for Proposal Development of the Town's Technology Infrastructure • Medical Payments-each person $10,000; • Personal Injury Protection -each person $2,500; • UninsuredlUnderinsured
MotOrist -Bodily Injury each person $20,000, each accident $40,000; Property Damage each accident $15,000. ID Statutory Workers' Compensation and Employers' Liability (EL) insurance:
• $500,000 each accident; • $500,000 disease -policy • $500,000 disease -each employee. e Professional Liability coverage of not less than $1,000,000 per claim to cover errors in programs
or in systems design and consulting operations. Coverage shall be continuous for not less than 24 months following completion of services under this Agreement. Prior to commencing any
work under this Agreement, the Vendor shall deliver to the Town of Addison insurance certificate confinning the existence of the insurance required by this Agreement. The insurance required
under the preceding paragraphs shall provide adequate protection for the Vendor and his sub-contractors, respectively, against damage claims that may arise from operations under this
contract, whether such operations be by the insured or by anyone directly or indirectly employed by him. On a contract awarded by the Town of Addison, an organization which qualifies
for exemption to the provisions of Article 20.04(H) of the Texas Limited Sales, ExCise, and Use Tax Act, the Vendor may purchase, rent or lease all materials, supplies, and equipment
used or consumed in the perfonnance of this contract by issuing an exemption certificate to his supplier in lieu of the tax, said exemption certificate to comply with State Comptroller's
Ruling .007. Any such exemption issued by the Vendor in lieu of the tax shall be subject to and shall comply with the provisions of the State Comptroller's Ruling .011, and any other
applicable State Comptroller ruling pertaining to the Texas Limited Sales, Excise, and Use TaxAcl. TMG Page: 39 CONSULnNG.INC. 
.V'" Request for Proposal 􀁾􀁾􀀮􀀠1'INf"®!._____Development of the Town's Technology Infrastructure 6.0 COST SHEETS The Vendor is required to complete and return the cost sheets as part
of their proposal. The attached costs sheets are included as examples, an electronic copy will be made available for those vendors seriously considering submitting a bid, To obtain an
electronic copy contact:Greg Galluzzi of TMG Consulting at 512-2882655 or email atTMGGreg@wor1dnet.att.net. TMG Page: 40 CONSULnNG. INC. 
Cover Solution Cost Worksheet Enter the name of your oaranization and/or the project name. Town -ofAddisQn';ltl'echnology'lnfrastruCturetpro}eritr 􀁾􀀢􀀢􀀢􀀠',t Complete the following
Cost Worksheets Table 1 Detailed Cost SChedule Table 2 Installation Cost by Vendor Table 3 Ongoing Costs for 5 Years Table 4 Payment Schedule Town of Addison Cost Proposal Page: 41 Date:
5/31/97 
1. Detailed Cost Schedule Town of Addison, Technology Infrastructure Project This table is used to reflect total system installation costs. A Number which uniquely identifies the detailed
cost component. B Description of the major cost category or detailed cost component C FYI to the Vendor, the Town's planned quantity and/or specification. This is provided for informational
purposes only. The vendor is expected to utilize professional expertise to provide the Town with an optimum configuration. The vendor is instructed to replace the Town's language with
their proposed specification o Name of the vendor providing the product or service E Number of item units (qty, hrs, etc) being provided F Unit cost of the item G Number of items times
the unit cost per item H Yearly maintenance amount Use the following cost sheet as a template and tailor to your response. B c UPS 1000 VA Rouleror HP D Town of Addison Cost Proposal
Page: 42. Date: 5/31/97 
1. DetaHed Cost Schedule A B c o E F G H Cost Category or Computers 7 Pentium 150 MHz, 32MB, 12.1 IActiVe, 2.1GB. Win 95197. CO·ROM Drive. Fthernet Docking stations, 3 year warranty.
to setup and connect 18 existing desktops with Ethernet card and patch cable. Town of Addison Cost Proposal Page: 43 Date: 5131/97 
1. DetaiLed Cost Schedule ABC 0 E F G H litem #1 􀁓􀁮􀁥􀁾􀁩􀁦􀁩􀁣􀁡􀁴􀁩􀁯􀁮􀀠Vendor I Units I Unit Cost I Tolal Yearlv for Cost Category or Ih>m new computers Emulation Software 2 May
require additional 53 emulation software licenses for UNIXIWindows NT access. Desktop Office Suite 2 Town of Addison Cost Proposal Page: 44 Date: 5/31197 
1. Detailed Cost Schedule A B c o E F G H or Item Town of Addison Cost Proposal Page: 45 Date: 5131/97 
1. Detailed Cost Schedule A B c o E F G H Town of Addison Cost Proposal Page: 46 Date; 5131197 
1. Detailed Cost Schedule A B c Planned with custom cabinet, 20 in touch screen. Pentium, 33.6 modem. Windows 95/97, Impact D E F G H Remote Access Software copies of /Access Page: 47
Date: 5/31/97Town of Addison Cost Proposal, 
1, Detailed CO$! Schedule 􀁾􀀠BCD E F G H litem iii Cost Category or Item Town of Addison Cost Proposal Page: 48 Date: 5/31/97 Specification Vendor IUnits IUnit Cost I Total V"".lv 
1. Detailed Cost Schedule Town of Addison Cost Proposal Page: 49 Date: 5131/97 
C 2. Installation Cost By Vendor Town of Addison, Technology Infrastructure Project· This table is used to reflect the total installation costs by vendor A Number uniquely identifying
the major cost category B Description of the major cost category Total installation costs summarized from Table 1 D·H Installation Costs by Vendor The Vendor will segment cost items
into major categories as identified in the table. ABC 0 E F G H ITEM # COST CATEGORY OR ITEM INSTALL VENDOR1 (insert VENDOR2 (insert VENDOR3 (insert VENDOR4 VENDORS (insert COST name)
name) name! (insert name) name) 1 Wide Area Network $0 2 Infrastructure Support $0 3 Disaster Recovery $0 4 Desktop /Notebooks $0 5 Office Suite $0 6 Office E·Mail $0 7 Office GroupWare
$0 8 Mopier/Laser Printer $0 9 Laser Color Printer $0 . 10 CD-ROM $0 11 Volume Storage $0 12 Communication Laver $0 13 Remote Computing $0 14 Fax Managemem $0 15 Public Kiosks $0 16
Council Electronic Access $0 17 Internet Access $0 18 Remote Presemation $0 19 Automated Voice Response $$0 20 Customer ReQuest/Complaint $0 21 Intranet $0 22 First Year Support .' $0
23 Project Management $0 24 Reserves & Contingencies $0 25 Other ...,. $0 ITotal $01 I Town of Addison Cost Proposal Page: 50 Date: 5/31/97 
C 3. Ongoing Costs for 5 Years Town of Addison. Technology Infrastructure Project This table is used to reflect the total annual costs for a 5 year timeframe. A Number uniquely identifying
the major cost category B Description of the major cost category Total annual costs summarized from Table 1 O·H Ongoing annual operating costs. The Vendor will segment cost items into
major categories as identified in the table. A B C o E F G H ITEM # ". 1 Wide Area 2 In :3 D_.... _.... _..4 5' l-SUpport 9 10 11 12 . Printer Laser Color 1: 1· IFilX Layer l-C Kiosks
Year 1 Year 2 Year 3 Cost $01 Year 4 YearS Total Per' Cost $a $0 $0 $0 $0 $0 $0 $ii $0 $ii $0 $C $C $0 $0 $0 $0 $0 $ii 20 Customer Request/Complaint $0 -r------$0 B ...lliI Voice 21
Intranet $0 $0 22 First Year Support $0 $0 23 Proiect Management $0 $0 24 JReserves & Contingencies J $0 -----T---r---,I $01 i 25 10ther I $0 I I I $01 \ ITotal I $0 $01 $0 $01 $0 $01
$01 Town of Addison Cost Proposal Page: 51 Date: 5/31/97 
C 4. Payment Schedule Town of Addison, Technology Infrastructure Project This table is used to reflect the expected payment schedule A Line item number B Vendor name and major cost catelJorv.
Installation cost from table 1 o Total amount due upon award of the contract E Total amount due as services are incurred or products provided F Total amount due at specific project milestones
(identify the milestone) G Total amount due upon fomnal acceptance Vendor will provide a breakdown of total cost into a payment schedule within the following table A SeD E F G ITEM #
Solution Components Install Cost Due At Contract Execution Due As Incurred Due At Milestone Due At Fomnal Acceptance 1 Wide Area Network $0 2 Infrastructure Support $0 3 Disaster Recovery
$0 4 Desktop /Notebooks $0 5 Office Suite $0 6 Office E·Mail $0 7 Office Groupware $0 8 Mopier/Laser Printer $0 9 Laser Color Printer $0 10 CD·ROM $0 11 Volume Storage $0 12 Communication
Layer $0 13 Remote Compu1lnQ $0 14 Fax Man'!gement $0 15 PubliC Kiosks $0 16 Council Electronic Access $0 17 intemet Access $0 . 18 Remote Presentation $0 19 Automated Voice Response
$0 20 Customer RequesUComplaint $0 21 Intranet $0 22 First Year Support $0 23 Project Man'!gement $0 24 Reserves & Contingencies $0 25 Other $0 ITotal I $01 $0 $01 $01 $0 Town of Addison
Cost Proposal Page: 52 Date: 5/31/97 
,, ) , ; 1.' 1 ). 1 i J 1 J 1 i ] OIRROILTON 1 j STORMWATER AND ·FLOOD PROTECTION ORDINANCE MAY, 1987 ! \ 
I ORDINANCE NO. 1375 INDEX ARTICLE 1 • TITLE, FINDINGS OF FACT, STATEMENT OF PURPOSE, SCOPE OF AUTHORITY, AND PENALTY FOR NON·COMPLIANCE Section A. Title....................•..........•..............
..............1 Section B. Findings of Fact.................................................1 Section C. Statement of Purpose.............................................l Section D.
Scope of Authority.......•.......................................2 Section E. Organization of This Ordinance...................................2 Section F. Related Ordinances.........................
......................3 ARTICLE 2 . DEFINITIONS ......................................................5 ARTICLE 3 . GENERAL PROVISIONS Section A. Lands to Which This Ordinance Applies
...........................13 Section B. Basis for Establishing the Areas of Special Flood Hazard........13 Section C. Penalty Clause..................................................13
Section D. Repealing Clause................................................13 Section E. Abrogation and Greater Restrictions.............................13 Section F. Interpretation..................
................................14 Section G. Warning and Disclaimer of Liability.............................14 Section H. Severability....................................................14
ARTICLE 4 -ADMINISTRATION Section A. Duties of City Officials........................................15 Section B. Responsibilities of Owners ......................................16
Section C. Permits.........................................................16 Section D. Plan Requirements ...............................................18 Section E. Maintenance Bonds..............
.....•...........................22 Section F. Appeals and Variance Procedure..................................23 ARTICLE 5 -RUNOFF CALCULATIONS Section A. Procedure for Drainage Areas
Less Than 160 Acres................25 Section B. Procedure for Drainage Areas Greater Than 160 Acres .............27 ARTICLE 6 • DESIGN OF LOCAL DRAINAGE SYSTEMS Section A. Design Storm
Frequencies ......................•.................28 Section B. Street and Alley Capacities.....................................28 Section C. Placement of Inlets....................................
.........29 Section D. Inlet Capacities and Sizes......................................29 Section E. Pipe Design Standards...........................................30 Section F. Culvert
Design Standards..•.....................................34 i 
ARTICLE 7 Section A. Section B. Section C. Section D. Section E. Section F. ARTICLE 8 Section A. Section B. Section C. Section D. SPECIAL DRAINAGE FACILITIES Channels ................................
........................35 Lakes and Dams ..................................................36 Levees.....................................•....................39 Detention and Retention
Facilities•.•...........................40 Flumes............................•..•..........................41 Connections from Buildings to Storm Sewers ......................41 FLOODPLAIN
GUIDELINES Lands to Which This Article Applies .............................42 General Floodplain Regulations ..................................42 Floodplain Alterations ..............•..............
.............46 Verification of Floodplain Alterations..........................47 it 
! TABLES TABLE 1 -VALUES OF "C" FOR USE IN RATIONAL METHOD FORMULA Q -CIA.........49 TABLE 2 -AVERAGE VELOCITY FOR USE IN DETERMINING TIME OF CONCENTRATION .... 50 TABLE 3 MINIMUM SLOPES
FOR CONCRETE PIPES ................................ 50 TABLE 4 MAXIMUM VELOCITIES IN CONDUITS FLOWING FULL AND CHANNELS ......... 51 TABLE 5 -ROUGHNESS COEFFICIENTS FOR CLOSED CONDUITS
.......................51 TABLE 6 -ENTRANCE LOSS COEFFICIENTS ....................................... 52 TABLE 7 -VELOCITY HEAD LOSS GOEFFICIENTS FOR CLOSED CONDUITS .............. 53
TABLE 8 ROUGHNESS COEFFICIENTS FOR OPEN CHANNEL FLOW AREAS ...............55 TABLE 9 SUITABLE VEGETATION FOR CHANNELS TEMPORARY VEGETATION .............................................
57 PERMANENT VEGETATION LOW AREAS ................................. S8 PERMANENT VEGETATION -SIDE SLOPES ............................... 59 PERMANENT VEGETATION -BERMS, SPOIL BANKS,
AND SIMILAR AREAS .....60 TABLE 10 -SYNOPSIS OF REQUIREMENTS TO PROTECT STRUCTURES FROM FLOODING ..... 62 TABLE 11 -PERMISSIBLE VELOCITIES FOR CHANNELS LINED WITH GRASS .............
65 ., I I iii 
FIGURES FIGURE 1 FIGURE 2 '1 FIGURE 3 I FIGURE 4 FIGURE 5 FIGURE 6 FIGURE 7 FIGURE 8 FIGURE 9 FIGURE 10 FIGURE 11 FIGURE 12 I FIGURE 13 FIGURE 14 ; I .! CITY OF CARROLLTON RAINFALL INTENSITY
VALUES ....................66 -CAPACITY OF TRIANGULAR GUTTERS ..................................67 CAPACITY OF PARABOLIC GUTTERS (26' & 36' STREET WIDTHS) .........68 • CAPACITY OF PARABOLIC
GUTTERS (40' AND 44' STREET WIDTHS) ....... 69 • CAPACITY OF ALLEY SECTIONS ...................................... 70 -STORM DRAIN INLETS ..•......•....................................
71 -RECESSED AND STANDARD CURB OPENING INLET CAPACITY CURVES ON GRADE (26' F·F STREET WIDTH, 4" PARABOLIC CROWN) .......... 73 • RECESSED AND STANDARD CURB OPENING INLET CAPACITY CURVES
ON GRADE (ALL STREET WIDTHS, 1/2 INCH/FOOT CROSS SLOPE CROWN; 36" F·F STREET WIDTH, 6" PARABOLIC CROWN) .............74 RECESSED AND STANDARD CURB OPENING INLET CAPACITY CURVES ON GRADE
(ALL STREET WIDTHS, 1/4 INCH/FOOT CROSS SLOPE CROWN) .......................................................75 • RECESSED AND STANDARD CURB OPENING INLET CAPACITY CURVES ON GRADE (ALL
STREET WIDTHS, 3/8 INCH/FOOT CROSS SLOPE CROWN; 40" F·F STREET WIDTH, 6" PARABOLIC CROWN; 44' F·F STREET WIDTH, 6" PARABOLIC CROWN) ............................76 • RECESSED AND STANDARD
CURB OPENING INLET CAPACITY CURVES ON GRADE (ALL STREET WIDTHS, 6" INVERTED CROWN) .............. 77 • RECESSED AND STANDARD CURB OPENING INLET CAPACITY CURVES AT LOW POINT (ALL STREET
WIDTHS, STRAIGHT AND PARABOLIC CROWN) ....................................................... 78 TWO GRATE COMBINATION INLET CAPACITY CURVES ON GRADE ............ 79 • THREE GRATE COMBINATION
INLET CAPACITY CURVES ON GRADE ..........80 iv 
I, FIGURE 15 • FOUR GRATE COMBINATION INLET CAPACITY CURVES ON GRADE ........... 81 FIGURE 16 . COMBINATION INLET CAPACITY CURVES AT LOW POINT .................. 82 FIGURE 17 TWO GRATE
INLET CAPACITY CURVES ON GRADE ........................83 FIGURE 18 • FOUR GRATE INLET CAPACITY CURVES ON GRADE .......................84 FIGURE 19 . SIX GRATE INLET CAPACITY CURVES
ON GRADE ........................85 FIGURE 20 . GRATE INLET CAPACITY CURVES AT LOW POINT ........................86 FIGURE 21· DROP INLET CAPACITY CURVES AT LOW POINT .........................
87 FIGURE 22 CAPACITY OF CIRCULAR PIPES FLOWING FULL .........................88 FIGURE 23 . OUTFALL OF A STORM SEWER INTO A CHANNEL .........................89 FIGURE 24· APPROXIMATE
ROUTING METHOD FOR WATERSHEDS < 160 ACRES ...........90 FIGURE 25 . NATURAL FLOODi-:AY EJoWIPLE ........................................92 v 
· i I i ORDINANCE NO. 1375 AN ORDINANCE OF THE CITY OF CARROLLTON. TEXAS. PROVIDING FOR COMPREHENSIVE DRAINAGE AND FLOOD PROTECTION IN THE CITY OF CARROLLTON; PROVIDING A TITLE; LISTING
FINDINGS OF FACT; DECLARING PURPOSES; STATING SCOPE OF AUTHORITY; DESCRIBING THE ORGANIZATION OF THIS ORDINANCE; DEFINING TERMS; DESCRIBING GENERAL PROVISIONS; EXPLAINING RUNOFF CALCULATIONS;
SETTING STANDARDS FOR THE . DESIGN OF LOCAL DRAINAGE SYSTEMS; ESTABLISHING STANDARDS FOR SPECIALTY DRAINAGE FACILITIES; PROVIDING FLOODPLAIN GUIDELINES; REPEALING ORDINANCE 905 AND 1051;
PROVIDING A PENALTY; AND PROVIDING AN EFFECTIVE DATE. BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF CARROLLTON. TEXAS; ARTICLE 1 SECTION 1 TITLE, FINDINGS OF FACT. STATEMENT OF PURPOSE.
AND SCOPE OF AUTHORITY ORGANIZATION OF THIS ORDINANCE SECTION A. Title This Ordinance shall be known as the "Official Stormwater and Flood Protection Ordinance" of the City of Carrollton.
and shall consist of a ninety-two (92) page document attached hereto and made a a part of this Ordinance. SECTION B. Findings of Fact 1. The drainage ways and flood hazard areas of the
City of Carrollton, Texas. are subject to periodic inundation which may result in loss of life and property. health and safety hazards. disruption of commerce and governmental services.
and extraordinary public expenditures for flood protection and relief, all of which adversely affect the public health. safety. and general welfare. 2. These flood losses are created
by the cumulative effect of obstructions in floodplains that increase flood heights and velocities and by the occupancy of flood hazard areas by uses vulnerable to floods and hazardous
to other lands because they are inadequately elevated. floodproofed, or otherwise protected from flood damage. SECTION C. Statement of Purpose This ordinance sets forth the minimum requirements
necessary to provide and maintain a safe. efficient. and effective drainage system within the City of Carrollton and to establish the various public and private responsibilities for
the provision thereof. Further, it is the purpose of this ordinance to: 1 
(1) Protect human life, health, and property; (2) Minimize expenditure of public money for drainage related projects; OJ Minimize damage due to drainage to public and private facilities
and utilities such as water and gas mains, electric service, telephone and sewer lines, streets and bridges; (4) Help maintain a stable tax base and preserve land values; (5) Insure
that potential buyers are notified that property is in an area of special flood hazard; (6) Insure that those who occupy the areas of special flood hazard assume responsibility for their
actions. (7) Preserve the natural beauty and aesthetics of the community. (8) Control and manage all stormwater runoff and drainage from points and surfaces within subdivisions. (9)
Establish a reasonable standard of design for development which prevents potential flood and stormwater damage. SECTION D. Scope of Authority Except as exempted by Article 9, Section
A, any person, firm, corporation, or business proposing to develop land or improve property within the the City of Carrollton is subject to the provisions of this ordinance. This ordinance
also applies to individual building structures, subdivisions, excavations and fill operations, and similar activities. SECTION E. Organization of This Ordinance This ordinance combines
the provisions of the former "Official Drainage and Stormwater Control Ordinance" (Ordinance No. 1051) with the "Flood Hazard Prevention Ordinance" (Ordinance No. 905). Further, it expands
and clarifies various aspects of these ordinances. The following list is a synopsis of the contents of each article. Article 1 -discusses the purposes, scope, and authority of this ordinance,
and provides a penalty for noncompliance with this ordinance. Article 2 -lists and defines various terms used in this ordinance. Article 3 -states general provisions related to implementation
and enforcement of this ordinance. Article 4 -overviews the administrative procedures to be followed for obtaining the necessary City drainage approvals related to building on or or
improving property. Article 5 -explains the methodologies to calculate runoff quantities. t J 2 
Article 6 -gives the design standards for building local drainage systems (Le., enclosed storm sewers). Article 7 -states additional design standards for specialty drainage system items.
Article 8 -presents the floodplain regulations, including the requirements to be met when reclaiming floodplain land. SECTION F. Related Ordinances In addition to this ordinance, the
City of Carrollton has other ordinances, regulations, and speCifications pertaining to drainage and storm sewer facilities. These other documents include the zoning and subdivision ordinances,
the Standard Specifications for Public Works Construction by the North Central Texas Council of Governments as amended by the City of Carrollton, and the General Design Standards for
the City of Carrollton, and shall remain in full force and effect. If there is any conflict between such prior ordinance and this ordinance, this ordinance shall prevail. SECTION 2 That
Ordinance 1051 and Ordinance 905 are hereby repealed. SECTION 3 Penalty for Violation. That any person, firm, or corporation violating 'my of the terms and provisions of this ordinance
shall be deemed guilty of a misdemeanor and, upon conviction thereof, shall be fined in the amount not to exceed $1,000.00. Each such violation shall be deemed a separate offense and
shall be punishable as such hereunder. 3 
SECTION 4 That this ordinance shall become effective from and after its passage. PASSED AND APPROVED MAY 􀀡􀁾􀀬􀀠1987. City of Carrollton, Texas Approved as to form: 􀁾􀁾􀁲􀁮􀁾4tf?;(
4 
ARTICLE 2 DEFINITIONS Unless specifically defined below, words or phrases used in this ordinance shall be interpreted to give them the meaning they have in common usage and to give this
ordinance its , i most reasonable application: Flare Angle between direction of a wingwall and centerline of culvert or storm drainage outlet or inlet. 2. Appeal A request for review
orinterpretation of any provisions of this ordinance or a request for a variance. 3. of Shallow Flooding A designated AO or AH Zone on the Flood Insurance Rate Map (FIRM). The base flood
depths range from one to three feet; a clearly defined channel does not exist; and the path of flooding is unpredictable and indeterminate. 4. Area of Special Flood Hazard The land in
the floodplain within a community subject to a one percent or greater chance of flooding in any given year. The flood having a one percent chance of being equalled or exceeded in any
given year, determined based upon FEMA guidelines and as shown in the current effective Flood Insurance Study. 6. Base Flood Elevation The water surface elevation resulting from the
base flood. 7. Conduit Any closed device for conveying flowing water. 5 
a. Critical Feature An integral and readily identifiable part of a flood protection system, without which the flood protection provided by the entire system would be compromised. 9.
Design Flood The flood having a one percent chance of being equalled or exceeded in any given year based upon fully developed watershed conditions. 10. Detention Basin A dry basin or
depression constructed for the purpose of temporarily storing stormwater runoff and discharging all of that water over time at a reduced rate than would have otherwise occurred. 11.
Developer/Builder A person, partnership, or corporation engaged in the development of land and/or building of structures and not excluded by exemption sections of this ordinance. 12.
Development Any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures, mining, dredging, filling. gradingt paving, excavation,
drilling operations, grading. or clz-aring. 13. Elevated Building In the case of Zones Al-30, AE, A, A99. A99. AO. AH, B, C. X, and D. an "elevated building" includes a building elevated
by means of fill so that the finished floor of the building is at least two feet above the water surface elevation of the design flood. j 14. Entrance Head The head required to cause
flow into a conduit or other structure; it includes both entrance loss and velOCity head. 15. Entrance Loss Head lost in eddies or friction at the inlet to a conduit, headwall, or structure.
! ) 6 
16. Equal Conveyance Principle of reducing stream conveyance for a proposed alteration with a corresponding reduction in conveyance to the opposite bank of the stream. The right of equal
conveyance applies to all owners and uses and may be relinquished only by written agreements. 17. Existing Construction For the purposes of determining rates, structures for which the
"start of construction" commenced before the effective date of Ordinance 90S. "Existing construction" may also be referred to as "existing structures." 18. Federal Emergency Management
Agency (FEMA) Federal agency which administers National Flood Insurance Program. 19. Flood £! Flooding A general and temporary condition of partial or complete inundation of normally
dry land areas from: (1) The overflow of inland waters and/or (2) The unusual and rapid accumulation or runoff of surface waters from any source. 20. Flood Insurance Rate Map (FIRM)
The official map on which the Federal Emergency Management Agency has delineated both the areas of special flood hazards and the risk premium zones applicable to the community. 21. Flood
Insurance Study The official report in which the Federal Emergency Management Agency has provided flood profiles, the water surface elevation of the base flood, as well as the Flood
Boundary-Floodway Map. 22. Floodplain £! Flood-prone Area Any land area susceptible to being inundated by water from any source (see definition of flooding). 23. Flood Protection System
Those physical structural works for which funds have been authorized, appropriated, and expended and which have been constructed specifically 7 
to modify flooding in order to reduce the extent of the areas wi thin a community subject to a "special flood hazard" and the extent of the depths of associated flooding. Such a system
typically includes hurri· cane tidal barriers, dams, reservoirs, levees or dikes. These special· ized flood modifying works are those constructed in conformance wi th sound engineering
standards. 24. Flume Any open conduit on a prepared grade, trestle, or bridge. 25. Freeboard The distance between the design flood elevation and the top of an open channelt dam, levee,
or detention basin to allow for wave action. floating debris, or any other condition or emergency without overflowing the structure. 26. Functionally Dependent Use A use which cannot
perform its intended purpose unless it is located or carried out in close proximity to water. The term includes only docking facilities. 27. Highest Adjacent Grade The highest natural
elevation of the ground surface prior to construction next to the proposed walls of a structure. 28. 28. Hydraulic Gradient A line representing the pressure head available at any given
point within the drainage system. 29. Levee A man-made structure, usually an earthen embankment, designed and con· structed in accordance with sound engineering practices to contain,
control, or divert the flow of water so as to provide protection from temporary flooding. 30. Levee System A flood protection system which consists of a levee, or levees, and associated
structures, such as closure and drainage devices, which are constructed and operated in accordance with sound engineering practices. 8 
31. Lowest Floor The lowest floor of the lowest enclosed area (including basement). An unfinished or flood resistant enclosure, usable solely for parking of vehicles, building access,
or storage in an area other than a basement area is not considered a building's lowest floor, provided that such enclosure is not built so as to render the structure in violoation of
the applicable non-elevation design requirements of FEMA 60.3. 32. Manning Equation The uniform flow equation used to relate veloCity, hydraulic radius, and energy gradient slope. 33.
Manufactured Home A structure transportable in one or more sections, which is built on a permanent chassis and is designed for use with or without a permanent foundation when connected
to the required utilities. For floodplain management purposes, the term "manufactured home" also includes park trailers, travel trailers, and other similar vehicles placed on a site
for greater than 180 consecutive days. For insurance purposes, the term "manufactured home" does not include park trailers, travel trailers, and other similar vehicles. For purposes
of the National Flood Insurance Program, the National Geodetic Vertical Datum (NGVD) of 1929 or other datum, to which base flood elevations shown on a community's Flood Insurance Rate
Map are referenced. 35. Manufactured Home Park 􀁾􀀠Subdivision A parcel or contiguous parcels of land divided into two or more manufactured home lots for rent or sale. 36. Natural Drainage
The dispersal of surface waters through ground absorption and by drainage channels formed by the existing surface topography which exists at the time of adoption of this ordinance or
formed by any man-made change in the surface topography. 37. Natural Floodway The effective area of a channel of a river or other water course and the adjacent land areas that must be
reserved in order to discharge the 9 
"design flood" without cumulatively increasing the water surface elevation. This floodway differs from the FEMA "regulatory floodway." 38. New Construction Structures for which the "start
of constructionll commenced on or after the effective date of Ordinance 905. 39. Open Channel A channel in which water flows with a free surface. 40. Other Municipal Ordinances Ordinances
such as, but not limited to, zoning, subdivision, and erosion. 41. Probable Maximum Flood Upper limit of a flood likely to occur as determined by Corps of Engineers' criteria. 42. Rational
Formula The means of relating runoff with the area being drained and the intensity of the storm rainfall. 43. Regulatory Floodway The channel of a river or other watercourse and the
adjacent land areas that must be reserved in order to discharge the "base flood," as calculated by the Federal Emergency Management Agency, without cumulatively increasing the water
surface elevation more than a designated height. This floodway is used by FEMA to determine compliance with its regulations . 44. Retention Basins A pond or other water body which has
been designed to have both a conservation pool for holding some water indefinitely and a flood storage pool for storing stormwater runoff on a temporary basis for the purpose of reducing
the peak discharge from the basin. 45. Standard Project Flood Flood that has a magnitude of approximately one half of the probable maximum flood, as determined on a case-by-case basis
using Corps of Engineers' current criteria. 10 
46. Start of Construction For a structure, nstart of construction" includes substantial improvement and means the date the building permit was issued, provided the actual start of construction.
repair, reconstruction) placement. or other improvement was within 180 days of the permit date. The actual start means either the first placement of permanent construction of a structure
on a site, such as the pouring of slab or footings, the installation of piles, the construction of columns, or any work beyond the stage of excavation; or the placement of a manufactured
home on a foundation. Permanent construction of a structure does not include land preparation, such as clearing, grading, and filling, nor does it include the installation of streets
and/or walkways; nor does it include excavation for basement, footings, piers, or foundations or the erection of temporary forms; nor does it include the installation on the property
of accessory buildings, such as garages or sheds not occupied as dwelling units or not part of the main structure, 47. Structure A walled and roofed building, a manufactured home, a
gas or liquid storage tank, or a substation that is principally above ground. 48. Substantial Improvement Any combination of repairs, reconstructions, or improvements of a structure,
the cumulative cost of which equals or exceeds SO percent of the initial market value of the structure either: (1) before the first improvement or repair is started, or (2) if the structure
has been damaged and is being restored, before the damage occurred. For the purpose of this definition, "substantial improvement" is considered to occur when the first alteration of
any wall, ceiling, floor, or other structural part of the building commences, whether or not that alteration affects the external dimensions of the structure, Incremental improvements
over a period of time, the cumulative cost of which equals or exceeds SO percent of the market value at the time of the first improvement, shall be considered as a ·substantial improvement,"
improvement," The term does not, however, include either: (1) any project for improvement of a structure to comply with existing State or local health, sanitary, or safety code specifications
which are solely necessary to assure safe living conditions or, (2) any alteration of a structure listed on the National Register of Historic Places or a State Inventory of Historic
Places. 11 
49. Surety A corporation surety bond, cash, certificate of deposit, or an irrevocable letter of credit. 50. Time of Concentration The estimated time in minutes or hours required for
a drop of water to flow from the most remote point in the drainage area to the point at which the flow 1s to be determined. 51. Use Any purpose for which a building or other structure
or a tract of land may be des igned, arranged, intended, maintained, or occupied; or any activity, occupation, business, or operation carried on, or intended to be carried on, in a building
or other structure or on a tract of land. 52. Use Permit The permit required before any use may be commenced. 53. Variance A grant of relief to a person from the requirements of this
ordinance when specific enforcement would result in unnecessary hardship. A 􀁶􀁡􀁲􀁩􀁡􀁮􀁣􀁥􀁾􀀠therefore. permits construction or development in a manner otherwise prohibited by this
ordinance. 54. Violation The failure of a structure or other development to be fully compliant with with this ordinance. A structure or other development without the elevation certificate,
other certifications, or other evidence as required by the City Manager, 1s presumed to be in violation until such time as that documentation is provided. 55. Watershed The area drained
by a stream or drainage system. 56. Water Surface Elevation The height, in relation to the NGVD or 1929 (or other datum, where specified), of floods of various magnitudes and frequencies
in the floodplains of riverine areas. 12 
ARTICLE 3 GENERAL PROVISIONS SECTION A. Lands!,£ Which This Ordinance Applies This ordinance shall apply to all areas of land within the jurisdiction of the City of Carrollton, Texas.
Certain provisions of this ordinance apply only to special flood hazard areas within the jurisdiction of the City of Carrollton, while other provisions exempt certain other tracts. These
limited areas of application are explained in the applicable provisions (See Article 8, Section A) . SECTION B. Basis for Establishing the Areas of Special Flood Hazard The areas of
special flood hazard identified by the Federal Emergency Management Agency in a scientific and engineering report entitled "The Flood Insurance Study for the City of Carrollton,· dated
July 16, 1980, with accompanying Flood Insurance Rate Maps and Flood Hazard Boundary-Floodway Maps and any revision thereto are hereby adopted by reference and declared to be a part
of this ordinance. The Flood Insurance Study is on file in the office of the City Engineer. SECTION C. C. Penalty Clause Any person, firm or corporation Violating any of the provisions
of this ordinance shall be deemed guilty of a misdemeanor and, upon conviction, shall be punished by a penalty or fine not to exceed the sum of One Thousand Dollars ($1,000.00) for each
offense, and each and every day such offense is continued shall constitute a new and separate offense. In addition, the violator shall pay all costs and expenses involved in the case.
Nothing herein contained shall prevent the City of Carrollton from taking such other lawful action as is necessary to prevent or remedy any violation. Article 4, Section C.3 states an
additional penalty against persons proceeding with construction without obtaining the necessary permits from the City of Carrollton. SECTION D. Repealing Clause The "Official Drainage
and Stormwater Control Ordinance" (Ordinance No. 1051) and the "Flood Hazard Prevention Ordinance" (Ordinance No. 905), heretofore adopted by the City Council of Carrollton, Texas, shall
be and the same same are hereby expressly repealed. All provisions of all ordinances conflicting with the provisions hereof are hereby repealed. All other ordinances and provisions of
such ordinances not expressly in conflict with the provisions hereof shall remain in full force and effect. SECTION E. Abrogation and Greater Restrictions This ordinance is not intended
to repeal, abrogate, or impair any existing easements, covenants, or deed restrictions. However, where this ordinance and 13 
other ordinance, easement. covenant, or deed restriction conflict or overlap. whichever imposes the more stringent restrictions shall prevail. SECTION F. Interpretation In the interpretation
and application of this ordinance, all provisions shall be: (1) (2) (3) Considered as minimum requirements; Liberally construed in favor of the governing body; Deemed neither to limit
nor repeal any other powestatutes. and. rs granted under State SECTION G. Warning and Disclaimer of Liability The degree of flood protection required by this ordinance is considered
reasonable for regulatory purposes and is based on scientific and engineering considerations. Larger floods can and will occur on rare occasions. Flood heights may be increased by man-made
or natural causes. This ordinance does not imply that land outside the area of special flood hazards or uses permitted within such areas will be free from flooding or flood damages.
This· ordinance shall not create liability on the part of the City of Carrollton. any officer or employee thereof or the Federal Emergency Management Agency for any flood damages that
result from reliance on this ordinance or any administrative decision lawfully made thereunder. SECTION H. Severability If any section. paragraph. clause. phrase, or provision of this
ordinAnce shall be adjudged invalid or held unconstitutional, the same shall not affect the validity of this ordinance as a whole or any part or provision thereof, other than the part
so decided to be invalid or unconstitutional; nor shall such unconstitutionality or invalidity have any effect on any other ordinances or provisions of ordinances of the City of Carrollton.
14 
ARTICLE 4 ADMINISTRATION SECTION A. Duties 􀁾Officials 1. Duties of the City Manager The CIty Manager is hereby appointed to administer and implement the floodplain management portions
of this ordinance, including Article 8 and other appropriate sections of 44 CFR (National Flood Insurance Program Regulations) pertaining to floodplain management. The duties of the
City Manager or his designee shall include but not be limited to: Review and approval of all Development Permits to determine that the permit requirements of this ordinance have been
met and that all necessary State and Federal permits have been obtained; Obtain and record the actual elevation in relation to mean sea level of the lowest habitable floor, including
basement of all new or substantially improved structures, and whether or not the structure contains a basement; Maintain for public inspection all records pertaining to the provisions
of this ordinance, including floodproofing certifications; Notify adjacent communities and the Texas Water Commission prior to any alteration or relocation of a watercourse, and submit
evidence of such notification to the Federal Emergency Management Agency; Require that maintenance is provided within the altered or relocated portion of said watercourse so that the
flood-carrying capacity is not diminished; Hake interpretations, where needed, as to the exact location of the boundaries of the areas of special flood hazards (for example, where there
appears to be a conflict between a mapped boundary and actual field conditions); and Obtain, review, and reasonably utilize any base flood elevation data available from a Federal, State
or other source, in order to administer this ordinance when base flood elevation data has not been provided. 2. Duties of the City Engineer The City Engineer is hereby appointed to administer
and implement the storm drainage system portion of this ordinance, and to assist the City Manager with the technical aspects of the floodplain management portions of this ordinance.
15 
SECTION B. Responsibilities of Owners The owner or developer of property to be developed shall be responsible for all storm drainage flowing through or abutting such property. This responsibility
also includes drainage directed to that property by ultimate development as well as the drainage naturally flowing through the property by reason of topography. It is the intent of this
ordinance that provision be made for storm drainage at such time as any property affected is proposed for development, use, or modification. Where the improvement or construction of
a storm drainage facility is required along a property line common to two or more owners, the owner hereafter proposing development of the property shall be responsible for the required
improvements at the time of development, including the dedication of all necessary rights-of-way or easements, to accommodate the improvements. Where a property owner proposes development
or use of only a portion of the property, provision for storm drainage shall only be be required in that portion of the property proposed for immediate development, except as construction
or improvements of a drainage facility outside that designated portion of the property is deemed essential to the development of that designated portion. Owners shall provide for stormwater
runoff and design drainage related facilities in accordance with and/or in a compatible manner with any City of Carrollton master drainage plan in effect at the time when plans for drainage
facilities are submitted to the City for approval. In addition, owners may be required to provide at their expense a preliminary drainage study for the totel area to be ultimately developed.
This study shall be submitted to the City Engineer as a part of the submitted data for consideration of preliminary plat or site plan approval for the portion of the property proposed
for immediate development. SECTION C. Permits The City of Carrollton has several permits related to storm drainage. Some of these permits are listed below and explained in detail in
the following paragraphs. Permits required by other ordinances may also be needed. -Development Permit -Floodplain Alteration Permit, formerly called the Fill Permit 1. Development Permit
All developers, owners, or builders shall obtain and submit for approval a Development Permit application for new construction, placement of fill, new manufactured home sites, alteration
of a waterway, substantial improvements to eXisting structures or manufactured homes, or improvements to existing structures, or manufactured homes in the floodplain of the design flood
that will result in increasing the overall outside dimensions of the structure or manufactured home. The application form can be obtained from the City Engineer's office. The City Engineer
uses this form, along with duplicate copies of the accompanying engineering or 16 
architectural plans, to identify those construction or renovation projects that would occur in a flood hazard area. As a minimum, the engineering or architectural plans shall show, to
scale: a. The nature, location, dimensions, and elevations in relation to mean sea level of the area in question. b. The elevation in relation to mean sea level and the location of existing
or proposed structures, fill, storage of materials, and/or drainage facilities. c. The elevation in relation to mean sea level to which an existing non-residential structure shall be
floodproofed, the location of the foregoing. d. Any off-site facilities or conditions that may either affect on-site conditions or be affected by on-site conditions. If an existing non-residential
structure is proposed for floodproofing, then a certificate sealed by a registered professional engineer in the State of Texas shall be submitted stating that all of the floodproofing
criteria listed in Article 8, Section B will be met. Construction or renovation projects cannot begin until the City issues the Development Permit. 2. Floodplain Alteration Permit Developers,
owners, or builders shall obtain a Floodplain Alteration Permit prior to filling in a floodplain; channeliZing, impounding, realigning, deepening, or otherwise modifying a natural drainage
way; making improvements, substantial or otherWise, to existing structures or manufactured homes in a floodplain if the improvements result in the increase of the overall outside dimensions
of the structures or manufactured homes; or otherwise reclaiming floodplain land. A Floodplain Alteration Permit application form can be obtained from the City Engineer's office. This
form along with duplicate copies of the engineering plans, reports, etc., shall be used by the City Engineer in reviewing the permit application. Article 4, Section D.2 identifies the
information that must be submitted to the City Engineer. No floodplain alterations shall begin until a permit is issued by the City Engineer. 3. Proceeding Without the Applicable Permits
Any developer, owner, or builder who fails to obtain the applicable Development, and/or Floodplain Alteration permit before beginning the subject project is in violation of this ordinance.
In addition to the penalties outlined in Article 3, Section C, no Building Permi t, plat, site plan, or Certificate of Occupancy shall be issued for any construction, reconstruction,
or development upon any land where such construction, reconstruction, or development is not in conformity with the requirements and intent of this ordinance. Anyone who violates any
of the terms and provisions of this ordinance shall be denied a Building Permit, etc., until the violation is corrected. 17 
4. Deviations Permit Terms Permits may be revoked by the City Engineer if, upon periodic inspection, he determines that the work is not progressing in accordance with specifications
of the approved plan and permit. Field changes to storm sewer plans can be made only upon approval by the City Engineer. Record drawings shall be submitted to the City Engineer at the
completion of the project. SECTION D. Plan Requirements Plan requirements for stormwater drainage systems and floodplain alterations are listed below. All engineering plans shall be
sealed by a professional engineer who is registered in the State of Texas and experienced in civil engineering work. The total cost for such engineering plans and specifications shall
be borne by the owner or the developer and shall be furnished to the City Engineer for review and approval. 1. Drainage Plans As part of the platting process, drainage plans shall be
prepared. These plans shall include drainage facilities for both off-site and on-site drainage so that the proper transition between the two can be maintained. Criteria for on-site development
shall also apply to off-site improvements. The construction of all improvements shall be in accordance with the current Standard Specifications for Public Works Construction by the North
Central Texas Council of Governments as amended by the City cf Carrollton, and Design Standards of the City of Carrollton. The drainage plans shall include: a. Drainage Area Map 1. Use
1"·200' scale for the development and up to 1"·2000' for creeks and off-site areas, provided that the scale is adequate for review, and show match lines between any two or more maps.
2. Show existing and proposed storm sewers and inlets. 3. Indicate sub-areas for each alley, street, off-site, etc. 4. Indicate contours on map for on-and off-site. 5. Indicate zoning
on drainage area. 6. Show points of concentration. 7. Indicate runoff at all inlets, dead-end streets and alleys, or to adjacent additions or acreage. B. Provide runoff calculations
for all areas showing acreage, runoff coefficient, inlet time., and storm frequency. 9. Indicate all crests, sags, and street and alley intersections with flow arrows. 10. Show limits
of each plan profile sheet. . 1 18 
b. Plan Profile Sheets 1. Show plan and profile of all storm sewers on separate sheets from paving plans. 2. Indicate concrete cushions where applicable. 3. Specify reinforced concrete
Class III pipe unless otherwise noted. Use heavier pipe where crossing railroads, deep fill or heavy loads. 4. Indicate property lines along storm sewer and show easements with dimensions.
5. Show all existing utilities in plan and profile of storm sewers. 6. Indicate existing and proposed ground line and improvements on all street, alley, and storm sewer profiles. 7.
Show hydraulic gradient with computations. 8. Show laterals on trunk profile with stations. 9. Number inlets according to the number designation given for the area or sub-area contributing
runoff to the inlet. 10. Indicate size and type of inlet on plan view, lateral size and flow line, paving station and top of curb elevation. 11. Indicate quantity and direction of flows
at all inle ts, stubouts, pipes and intakes. 12. Show future streets and grades where applicable. 13. Show water surface at outfall of storm sewer, velocity, and typical section of receiving
water body. 14. Where fill Is proposed or trench cut in creeks or outfall ditches, specify compacted fill and compaction criteria. 15. Show size of pipe, length of each pipe size, stationing
at one hundred foot intervals in the plan view. 16. Begin and end each sheet with even or fifty foot stationing. 17. Show diameter of pipes, physical grade, discharge, capacity of pipe,
slope of hydraulic gradient, and velocity in the pipe in the profile view. 18. Show elevations of flow lines at 100-foot intervals on the profile. 19. Give bench mark information. 20.
Show capacities, flows, velocities, etc.,of the existing system into which the proposed system is being connected. 21. Show details of all connection boxes, headwalls on storm sewer, flumes or any other item not a standard
detail. 22. Provide lateral profiles where utilities are crossed and show all utilities in profile. 23. Show headwalls and specify type for all storm sewers at outfall. 24. Show if curbing
in alleys is needed to add extra capacity. 25. Provide flat grade alleys and streets to discharge into streets. 26. Show curve data for all storm sewers. 27. Tie storm sewer stationing
with paving stations. 28. On all dead-end streets and alleys, show grades for drainage overflow path on the plan and profile sheets, and show erosion controls. 29. Specify concrete strength
for all structures. 19 
30. Provide sections for road, railroad and other ditches with profiles and hydraulic computations. Show design water surface on profile. c. Bridge Plans 1. Show the elevation of the
lowest member of the bridge and 100year water surface elevation. 2. Indicate borings on plans. 3. Provide soils report. 4. Show bridge sections upstream and downstream. 5. Provide hydraulic
calculations on all sections. 6. Provide structural details and calculations with dead load deflection diagram. 7. Provide vertical and horizontal alignment. d. Creek Alteration and
Channel Plans 1. Show stationing in plan and profile. 2. Indicate flow line, banks, design water surface, and freeboard. Show hydraulic computations. 3. Indicate nature of banks such
as rock, earth, etc. 4; Provide cross-sections with ties to property lines and easements. 5. Show side slopes of creek, channels, etc. 6. Specify compacted fill where fill is proposed.
7. Indicate any adjacent alley or street elevations on creek profile. 8. Show any temporary or permanent erosion controls. 9. Indicate existing and proposed velocities. 10. Show access
and/or maintenance easements. 11. As necessary, show ground elevations parallel to the top of bank to show how runoff is prevented from overland flow into the creek or channel. e. Detention
and Retention Facilities 1. Show plan view of detention/retention area and outlet structure. 2. Delineate limits of conservation pool, sediment storage area, flood storage pool, and/or
freeboard. 3. Indicate size, dimension, total capacity, design discharge and velocity of the outlet structure. 4. Show any erosion control features at the discharge point of the outlet
structure. 5. Specify side slopes of basin and outlet structure. 6. Show existing or proposed structures or other facilities downstream of the outlet structure and emergency spillway,
and provide information sufficient to show that the downstream facilities will not be inundated or otherwise affected by the discharge from the basin. 7. Indicate locations and quantities
of all inflows to the basin. S. State the design time to empty the basin. 20 
f. Levees 1. Show location, extent, nature, dimensions, etc., of levee embankments and associated interior and exterior drainage facilities. 2. Provide engineering analysis addressing
potential erosion of the levee embankments during flood events. 3. Provide engineering analysis of levee embankment stability and seepage through the levee during flood events. 4. Demonstrate
that future settlement of the levee embankments will not result in freeboard dropping below the minimum requirements. 5. Analyze interior drainage concerns. Identify sources of interior
flooding, and extent and depth of such flooding, assuming a joint probability of interior and exterior flooding. Consider capacity of pumps and other drainage devices for evacuating
interior waters. 6. Write an operations manual which discusses the flood warning system to trigger closures; closure operations, procedures, and personnel; operation plans for interior
drainage facilities; at least an annual inspection program; and maintenance plans, procedures, and frequency. 7. Provide all other information required in Article 7, Section C, and any
other information requested or required by the City Engineer and/or the Federal Emergency Management Agency. 2. Floodplain Alteration Plans The materials listed below shall be submitted
as part of the application for a Floodplain Alteration Permit. It is recommended that applicants coordinate the application materials listed below with those needed for other City of
Carrollton permits and with the data requirements of the Federal Emergency Management Agency. Such coordination will facilitate staff review and drawings could be combined so as to save
the applicant from mUltiple drawings. a. An engineering report consisting of at least: 1. Project description. 2. Description of the hydrologic and/or hydraulic analyses used, including
method used to determine historic rainfall and stream data, soils reports used to determine erosive velocity values, and discharges and water surface elevations for both the design and
base floods. 3. Vicinity map. 4. Evaluation of the "natural floodway" and floodplain limits for the design flood. The "natural floodway" differs from the FEMA "regulatory floodway."
The "natural floodway" is established to allow the City of Carrollton to effectively manage floodplain areas. FEMA requirements for the "regulatory floodway" must also be met by applicants.
21 I 
5. If hydraulic analyses are being submitted, then a table of values for existing and proposed water surface elevations and velocities must be included. 6. Documentation that the principle
of equal conveyance has been achieved. 7. Copies of computer input and output data for existing and proposed conditions for both the base flood and design flood discharges. b. Engineering
drawings consisting of at least: 1. Water surface profile, including channel flow line, existing and proposed water surface elevations, recorded high water marks, and location and number
designation of cross-sections. 2. Plan view on 24" x 36" paper, including a. Scale and north arrow. b. Title block. c. Boundary lines and nearest street intersections. d. Existing and
proposed contours. e. Existing and proposed floodplain limits, and limits of the "natural floodway" and the "regulatory floodway." f. Area to be removed from the floodplain or area to
be altered. g. Top and toe of fill and/or side slopes and the numerical slope of the fill and/or side slopes labeled. h. Location of all other associated improvements or a1terations
to the creek and/or floodplain, such as check dams, swales, channel modifications, etc. i. Location of cross-sections. j. Location of all existing and proposed easements and dedications.
k. Site vicinity map. 3. Plots of cross-sections, including: a. Scale. b. Title block. c. Existing and proposed ground elevations. d. Cut and/or fill areas labeled. e. Limits of and
numerical values for existing and proposed tlntf va.lues. f. Equal conveyance removed from both sides. SECTION E. Maintenance Bonds The Contractor shall guarantee the work which he does
against defective work· manship and materials for a period of two (2) calendar years from the date of final acceptance by the City. Where defective workmanship and/or materials are discovered
requiring repairs .J 22 i 
to be made under this guarantee, all such repair work shall be done by the Contractor at his own expense within ten (10) calendar days after written notice of such defect has been given
to him by the City. Should the Contractor fail to make repair or correct such defective workmanship and/or materials within ten (10) calendar days after being notified, the City may
make the necessary repairs and charge the Contractor with the actual cost of all labor and materials required. The Contractor shall provide a maintenance bond in the amount of 10% of
the contract price, for a period of two (2) years after the date of acceptance of the work to cover his guarantee as set forth above. SECTION F. Appeals and Variance Procedure 1. Appeal
Any person aggrieved by a decision of the City Engineer or City Manager may appeal from any order, requirement, decision or determination of the City Engineer to the Planning and Zoning
Commission. An appeal from a determination of the Planning and Zoning Commission may be made directly to the Court of Appeal. 2. Variances The Planning and Zoning Commission as established
by the City of Carrollton shall hear and decide requests for variances from the requirements of this ordinance. Variances concerning Development Permits may be issued for the reconstruction.
rehabilitation or restoration of structures listed on the National Register of Historic Places or the State Inventory of Historic Places, without regard to the procedures set forth in
the remainder of this section. Variances shall not be issued within any designated natural or regulatory floodway if any increase in flood elevations during the design flood discharge
would result. Variances shall be issued only upon a determination that the variance is the minimum necessary to afford relief considering the flood hazard, drainage problems, and soil
loss. Variance shall be issued only upon meeting all three of the following criteria: 1. A showing of good and sufficient cause. 2. A determination that failure to grant the variance
would result in exceptional hardship to the applicant; and, 3. A determination that the granting of a variance will not result in increased flood heights, additional threats to public
safety, extraordinary public expense, create nuisances, caUSe fraud on Or victimization of the public, or conflict with existing local laws Or ordinances. 23 
Any applicant to whom a variance for building or renovating in a floodplain is granted shall be given written notice that the structure will be permitted to be built with a lowest floor
elevation below the design flood elevation and that the cost of flood insurance will be commensurate with the increased risk resulting from the reduced lowest floor elevation. In considering
variance requests, the Planning and Zoning Commission shall consider all technical evaluations, all relevant factors, standards specified in other sections of this ordinance, and the:
Danger that materials may be swept onto other lands to the injury of others; -Danger to life and property due to drainage, flooding, or erosion damage; Susceptibility of the proposed
facility and its contents to flood damage and the effect of such damage on the individual owner; Importance of the services provided by the proposed facility to the community; Necessity
to the facility of a waterfront location, where applicable; -Availability of alternative locations for the proposed use which are not subject to flooding damage. -Compatibility of the
proposed use with existing and anticipated development. Relationship of the proposed use to the comprehensive plan and floodplain management program of that area. Safety of access to
the property in times of flood for ordinary and emergency vehicles; Expected heights, velocity, duration, rate of rise, and the effects of wave 􀁡􀁣􀁴􀁩􀁾􀁮􀀬􀀠if applicable, expected
at the site; and, Costs of providing governmental services during and after storm events, including maintenance and repair of public utilities and facio lities such as sewer, gas, electrical,
and water systems, and streets and bridges. Upon consideration of the factors listed above and the purposes of this ordinance, the Planning and Zoning Commission may attach such conditions
to the granting of variances as it deems necessary to further the purposes of this ordinance. The City Manager shall maintain the records of all appeal actions, including technical information,
and report any variances of the floodplain management portions of this ordinance to the Federal Emergency Management Agency upon request. 24 
ARTICLE 5 RUNOFF CALCULATIONS The selection of which method to use for calculating runoff depends upon the size of drainage area contributing runoff at a most do"nstream point of a project.
The "Rational Method" is acceptable for situations in which the drainage area is less than 160 acres. A unit hydrograph method is required for situations with larger drainage areas.
No matter which method is used to calculate runoff, a developer or builder of property greater than one acre in size shall develop the property so that the rate of runoff created by
the development as it leaves the property does not exceed the rate of runoff that would have been created if the property had developed as single-family residential property, Article
7, Section 0 discusses design criteria for detention facilities. Runoff computations shall be based upon fully developed watershed conditions in accordance ."ith the land use proj ections
in the latest comprehensive land use plan for the City of Carrollton. The design engineer shall size drainage facilities by disregarding the detention effects of upstream property and
calculating the runoff as if the off-site property was developed without any detention. If an approved regional detention/retention facility is in operation, the design engineer may
size do"nstream drainage facilities based on consideration of the detention effects of the regional facility. SECTION A. Procedure for Drainage Areas Less Than 160 Acres. 1. Rational
Method Computation of Storm Water Runoff for drainage areas less than 160 acres shall be by the "Rational Method," "hich is based on the principle that the maximum rate of runoff from
a given drainage area for an assumed rainfall intensity occurs when all parts of the area are contributing to the flow at the point of discharge. The formula for calculation of runoff
by the "Rational Method" is: (Equation 1) Q CIA Where: Q the maximum rate of discharge, expressed in cubic feet per second. C -a runoff coefficient which varies with the topography,
soil, land use and moisture content of the soil at the time the runoff producing rainfall occurs. This runoff coefficient shall be based on the ultimate use of the land as recommended
by the Master Plan for the City of Carrollton and shall be selected from Table 1 herein on the basis of the use shown on land use and zoning map of the Comprehensive Zoning Ordinance
for the City of Carrollton. If an area has had a change of Zoning to give the area land use for which the "C" in Table 1 is higher 25 
than use shown on land use and zoning maps, the higher "C" factor shall be used. A -The drainage area, expressed in acres, contributing to the runoff at the point in question. Calculation
of the drainage area shall be made from an accurate topographic map, a copy of which shall be submitted with the engineering plans for approval. I -Rainfall intensity in inches per hour
for the time period that it takes for flow from the farthest point of the drainage area to reach the point of design. The rainfall intensity is found by referring to the applicable curves
of Figure 1. Time of Concentration or Duration of Rainfall for use in Figure I shall be calculated by velocity data shown in Table 2. Time of concentration is the longest time, without
interruption of flow by detention devices, that a drop of water takes to flow from the farthest point of the drainage area to the point of concentration (i.e., the point of design).
The time of concentration is composed of the "inlet time" and the flow time in a conduit or channel to the point of design. Equation 2 shows how to calculate the time of concentration.
(Equation 2) L Tc -Inlet Time + "V'--x-670;;-s-e-c-/7'm""i=-n Where: Tc -Time of concentration in minutes. Inlet time -10 minutes for property zoned multiple family, loco.. business,
central business, commercial, or industrial or 15 minutes for property zoned for parks, cemeteries, agricultural, schools, and single family residential. L -Length of conduit or channel
in feet. v -Velocity of flow in conduit or channel in feet per second. When designing inlets and laterals, the time of concentration is simply equal to the inlet time. In certain circumstances,
the design engineer may choose not to use the above specified inlet times and to actually calculate the inlet time by computing the flow time overland and along the gutter to the first
inlet. The Manning equation, along with the velocity information in Table 2 (or other acceptable procedures such as the SCS method), shall be used to determine flow time to the inlet.
inlet. If calculating inlet time, in no case shall a longer inlet time be used than 10 minutes for multiple family, commercial, industrial and business areas and 15 minutes for parks,
cemeteries, agricultural, schools, and Singlefamily areas. 26 
When sizing storm sewers and channels, the time of concentration shall be calculated by adding inlet time to flow time in the conduit and/or channel. SECTION B. Procedure for Drainage
Areas For drainage areas in excess of 160 acres where the use of the "Rational Method" does not provide reliable results, the use of a unit hydrograph method shall be made. The use of
a unit hydrograph calculation will be based upon standard and accepted Engineering Principles normally used in the Profession subject to the approval of the City Engineer. Acceptable
methods include the Soil Conservation Service (SCS) Technical Release Number 55 for drainage areas from 160 acres to 2,000 acres, and SCS's TR20 or the Corps of Engineers REC-l models
for drainage areas 160 acres or more. The unit hydrograph method shall be based upon fully developed watershed conditions assuming no effects from the small on-site detention facilities
for maintaining the rate of runoff as if the property was developed as single family residential uses. The detention effects of large regional detention facilities can be taken into
account in unit hydrograph methods. Circumstances that may require the use of a unit hydrograph method include sizing open channels, reclaiming floodplains, creating lakes, or building
other types of drainage-related facilities on major drainage courses. Design engineers of these types of facilities should be aware that the requirement of designing for fully developed
watershed conditions will mean that they will have to calculate these fully developed flows instead of using the flows calculated in the Federal Emergency Management Agency's (FEMA)
flood insurance studies for Carrollton. FEMA's flows cannot be used because the flows are based upon existing watershed conditions (For more information, see Article 7 on the sizing
of channels and other major drainage facilities and Article 8 for floodplain alteration procedures). Use of the rational method is allowed for design of storm sewers within the project
area. 27 
ARTICLE 6 DESIGN LOCAL DRAINAGE SYSTEMS SECTION A. Design Storm Frequencies The calculations of runoff quantities that must be accommodated facilities require the selection of the design
storm frequency. storm frequencies for various drainage structures are given below. in drainage The design DRAINAGE FACILITY Closed Storm Sewer Systems Closed Storm Sewer Systems and
Inlets at Street Low Point or Sag Culverts and Bridges Concrete-lined Channels Earthen Channels Levees Dams Above Natural Ground/Spillways DESIGN RECURRENCE INTERVAL lO-year with laO-year
positive overflow for Inlets on Grade in streets such that the depth of flow in the street does not exceed one inch above the top of curb. lOa-year lOa-year lOa-year laO-year Standard
Project Flood Spillway design flood varies with the class of structure (see Article 7, Section B). The approved drainage system shall provide for positive overflow at all low points.
The term "positive overflow· means that when the inlets do not function properly or when the design capacity of the conduit is exceeded, the excess flow can be conveyed overland along
a paved course. Normally, this would mean along a street or alley, but it can require the dedications of special drainage easements on private property. SECTION B. Street and Alley Capacities
1. Streets Assuming parkway slopes to be 1/4 inch per foot behind the curbs, the depth of flow in the streets shall not exceed one inch above the top of curb. Figure 2 shows the capacity
of streets with a straight cross slope that varies from 1/8 inch per foot to 1/2 inch per foot, which are the minimum and maximum allowable street cross slopes. Figures 3 and 4 show
the capacity of streets with parabolic crowns. These curves do not 28 
include the additional street or parkway capacity in the area one inch above the top of curb. 2. Alleys The flows created by the 100-year storm shall be contained within the capacity
of all paved alleys. Figure 5 shows the capacity of various alley sections. I Alley capacities shall be checked at all alley turns and "T" intersections to determine if curbing is needed
or grades should be flattened. Curbing shall be required for at least 10 feet on either side of an inlet in an alley and on the other side of the alley so that the top of the inlet is
even with the high edge of the alley pavement. 3. Finished Floor Elevations in Relation £2 Alleys and Streets The first floor elevations of all residential and other structures shall
be set at a minimum elevation of the lower of either l.5 feet above the alley invert or one foot above the top of the street curb elevation, and with positive drainage provided away
from the structure. SECTION C. Placement of Inlets Storm sewer inlets shall be built along paved streets at such intervals that the depth of flow, based upon the 100 -year storm, does
not exceed one inch above the top of curb. Inlets shall be located as necessary to remove the flow based on a 10 -year storm. If in the opinion of the design engineer the flow in the
gutters would be excessive using the above design criteria, the storm sewers or inlet locations could be al tered to relieve adverse conditions. Inlets shall be placed upstream from
an intersection whenever possible. At any intersection, only one street shall be crossed with surface drainage and this street shall be the lower classified street. When an alley intersects
a street, inlets shall be placed in the alley whenever flow down that alley would cause the capacity of the intersecting street to be exceeded. SECTION D. Inlet Capacities and Sizes
Figure 6 shows the various types of inlets allowed for use along various kinds of streets. Other types of inlets may be used upon the approval of those inlets by the City Engineer. The
minimum inlet size shall be eight feet. Figures 7 through 21 show how to determine the capacity of inlets. No more than 20 feet of inlets shall be placed along one gutter. Minimum sizes
of laterals shall be IS-inches for use with S-foot inlets, and 21-inch laterals with 10-foot, 14-foot, and drop inlets. Where laterals tie into trunk lines, place the laterals on a 60·
angle with the trunk line and connect them so that the longitudinal centers intersect. i i 29 
SECTION E. Pipe Design Standards 1. The Manning Equation Storm sewer conduit shall be sized to flow full. Manning's Equation shall be used to determine the conduit size. Manning's equation
is expressed as: (Equation 3) 1.486 (A) (R)2/3 (8)1/2 or V _ 1.486 (R)2/3 (S)1/2Q n n Where: Q -Flow in cubic feet per second. V -Velocity of flow in conduit in feet per second. A -Cross-sectional
area of the conduit in square feet. R -Hydraulic radius of the conduit, which is the area of flow divided by the wetted perimeter (R -A/P). S Slope of the hydraulic gradient. n -Roughness
coefficient of the conduit. P -Wetted perimeter. Figure 22 is a graphical solution of Manning's Equation, which allows sizing of concrete pipe, assuming an "n" value of 0.013. 2. Minimum
and Maximum Velocities in Pipes The minimum velocities in conduit shall be 2.5 feet per second. The minimum slopes for various pipe sizes that will maintain this minimum velocity are
given in Table 3. The recommended maximum velocities of flow in the conduit and channels are given in Table 4. The maximum discharge velocities in the pipe shall also not exceed the
permitted velocity of the receiving channel or conduit at the outfall to prevent erosive conditions, as shown in Table 4. The maximum outfall velocity of a conduit in partial flow shall
be computed for partial depth and shall not exceed the maximum permissible velocity of the receiving channel unless controlled by an appropriate energy dissipator. 3. Roughness Coefficients
for Conduits In general, storm water shall be carried in concrete pipe conduit, but other types of conduit can be used to carry storm water. However, prior permission to use metal conduit
must be obtained from the City Engineer. Table 5 shows recommended roughness coefficients for various types of conduits. If, in the opinion of the design engineer, other values for 30

the roughness coefficient should be used, the different value can be used with the permission of the City Engineer. Appropriate nates of the approved roughness coefficient shall then
be shown an the engineering plans. 4. Hydraulic Gradient of Conduits Conduits must be sized and slopes must be set such that runoff flows smoothly down the drainage system. To insure
this smooth passage, the hydraulic gradient must be at the proper elevations. The proper starting elevation of the hydraulic gradient shall be set according to the applicable criteria
listed below: 1. When a proposed conduit is to connect to an existing storm sewer, the hydraulic gradient of the proposed storm sewer should start at the elevation of the hydraulic gradient
of the existing storm sewer. This criterion will be used for existing systems whether or nat they are adequately designed. 2. When a proposed conduit enters an open channel, creek, or
flood control sumps, the hydraulic gradient of the proposed conduit should start at the lO-year water surface elevation of the channel or creek when the ratio of the drainage area of
the receiving creek (at the development) to the development area is 15 or greater. For ratios of less than 15, the lOO-year water surface will be used on the receiving creek. Not only
is it important to use the proper starting elevation for the hydraulic gradient, but proper hydraulic gradient elevations must be maintained for the length of the conduit. The inside
top of the conduit should be at or below the hydraulic gradient. However, effort should be made to keep the top of the pipe as close to the hydraulic gradient as possible so that deep
excavations to lay pipe are not required. When the conduit is flowing partially full, the hydraulic gradient shall be shown at the inside crown of the conduit. The hydraulic gradient
shall be kept two feet below the top of curb. If 􀁴􀁨􀁾􀁳􀀠cannot be obtained, the hydraulic gradient shall be at least 1.5 VI /2g feet below the gutter line, where VI is the veLocity
in the lateral. 5. 􀁾􀁾Head Losses When establishing the hydraulic gradient of a storm sewer, minor head losses at points of turbulence shall be calculated and included in the computation
of the hydraulic gradient. Entrance Losses Entrance losses to a closed storm sewer system from an open channel or lake shall be calculated using Equation 4. 31 
(Equation 4) Where: HL -Head loss in feet. VI -Velocity in the downstream pipe in feet per second. Ke -Head loss coefficient (see Table 6). The resulting hydraulic gradeline shall be
compared to inlet control conditions for the storm sewer as described in Section F. The higher of the two values will be used as the controlling upstream hydraulic grade line. Expansion
􀀱􀀲􀁾􀁾􀀠For pipe size expansions, head loss shall be calculated using the following equations: (Equation 5) 2V1( 1 2g ..'here: HL -Head loss in feet . VI Upstream velocity in feet
per second. Dl Upstream pipe diameter. D2 -Downstream pipe diameter. Manhole and Bend Losses Head losses associated with manholes for pipe direction changes and bends in pipes of equal
diameter shall be calculated using: (Equation 6) V 2 2 Kb2g Where; HL -Head loss in feet. -Velocity in the downstream pipe in feet per second.V2 Kb -Head loss coefficient from Table
7. 32 
Junction Losses Head losses associated with wye connections or manholes with branch laterals entering the main line can be calculated by using Equation 7. (Equation 7) v 2 V 2 HL -2
Kj-1 2g 2g Where: HL -Head loss in feet. VI -Velocity in the upstream pipe in feet per second. Velocity in the downstream pipe in feet per second.V2 Head loss coefficient from Table
7.Kj 6. Outfall. to Open Channels and Lakes The flow lines of storm seWer conduits that discharge into open channels shall match the flow line of the channel. One exception to this requirement
of matching the flow line is when a storm sewer discharges into a concrete-lined channel, or when the outfall is submerged below the normal water surfaceof a lake. In the case of a pipe discharging to a lined channel, the outlet must be below the top of the channel lining. The second exception pertains to storm sewer discharge that must
cross wide floodplain areas. Under this condition, the storm sewer could discharge into a lined ditch which would convey runoff to the flow line of the channel without creating an erosive
condition. Permissible velocities within the ditch will be based on the type of lining used and the velocities provided in Table 4. Flumes to bring the discharge down to the flow line
of earthen creeks shall not be permitted. Drop structures shall be allowed upon written approval of the City Engineer. The velocity at the discharge end of the conduit shall be computed
based on partial flow depth and shall be sufficiently low so as to not cause downstream erosion problems. Table 4 shows the maximum velocities allowed in various types of channels, which
are then the maximum discharge velocities at storm sewer outfall•. In some circumstances, the configuration of the storm sewer in relation to the flow line of the creek may cause excessive
velocities to be reached unless provisions are made to slow the velocity. One recommended method of slowing the velocity is to have the last length of pipe (a length of at least ten
times the diameter) be on a slope that will reduce the partial flow outlet velocity to the values shown in Table 4 for the receiving stream. Stilling basins shall also be allowed to
reduce discharge velocities. The discharge pipe shall also intersect minor creeks at an angle not to exceed 60 degrees. Minor creeks are defined as those creeks, channels, or drainageways
where the distance from the pipe outlet to the opposite 33 
creek bank at the bottom of the channel is twenty (20) feet or less. Pipes may intersect maj or creeks (greater than 20 feet to opposite bank) at a 90-degree angle. The City Engineer
may require that pipes intersect major creeks at an angle not to exceed 60 degrees, when a 90-degree angle would result in an erosive condition. Figure 23 shows how a storm sewer should
be configured to discharge into a creek. 7. Easements for Enclosed Storm Sewers All storm sewer conduits to be dedicated to the City of Carrollton shall be located in an easement dedicated
to the City of Carrollton at the time of final platting of the property. The easement shall be at leas t 15 feet wide or wider if the City Engineer requires it for maintenance or other
purposes. SECTION F. Culvert Design Standarda Culverts shall be designed in accordance with the Texas Highway Department HydrauliC Manual, Chapter 4 -Culverts. The calculation of hydraulic
gradelines will consider both inlet and outlet control for the culvert. Starting water surface elevations for gradeline calculation will be the same as required for storm sewers; see
Section E. 34 
ARTICLE 7 SPECIAL DRAINACE FACILITIES SECTION A. Channels 1. Channel Design Open channels may be used instead of enclosed systems when the drainage area of contributing flow to the channel
is greater than 160 acres. Open channels shall not be permitted when the drainage area is less than 160 acres unless approved by the City Engineer. Table 4 shows the maximum velocities
allowed for certain types of channels. Roughness coefficients for the design of open channels are provided in Table 8. The following criteria shall be used in determining the nature
of the open channel. For channels with 􀁾􀀠contributing drainage area of 160 to 320 􀁾􀀺􀀠a. If the natural channel is to be replaced by an improved channel, the flow from the lOO-year
design flood must be contained within the improved channel while allowing for one foot of freeboard. b. Improved channels shall be concrete-lined if the design velocity is greater than
eight feet per second. Other types of linings, like gabions, may be used upon approval of the City Engineer. Improved channels with design velocities of less than the permissible velocities
shown in Table 11 may be earthen if the channels are revegetated properly. c. For lined channels, all of the channel bottom and at least the first three feet (vertical height) of the
side slopes up from the channel bottom shall be lined. d. Earthen sides above the concrete lining or totally earthen channels shall be on at least a four horizontal to one vertical slopes
and shall have approved ground cover to prevent erosion. e. The developer or owner shall use low maintenance vegetation for vegetative cover, as approved by the City Engineer prior to
planting. The selection of materials shall comply with either the current ground cover listing for North Central Texas furnished through the Texas AgrIcultural Extension Service or Table
9 in this ordinance. For 􀁾􀀠contributing drainage 􀁾of greater than 320 􀁾􀀺􀀠a. The channel shall be left in its natural, unimproved state and all land within the lOO-year floodplain
of of the design flood, and any required maintenance easement (see paragraph 3 below) shall be dedicated to the City of Carrollton as a permanent drainage rightof-way and open space
corridor. b. Alternatively, if the property owner so desires, the City of Carrollton may allow an improved channel capable of carrying the 100-year design flood while maintaining a freeboard
of one foot. An 35 
improved channel shall only be allowed if it meets the floodplain alteration regulations presented in Article 8. c. Unless shown to be feasible in a soils report sealed by a registered
professional engineer in the State of Texas, and approved by the City Engineer, improved channels shall have minimum side slopes of: 4 feet horizontal to 1 foot vertical for earthen
grassed side slopes. 1.5 feet horizontal to 1 foot vertical for side slopes in rock. 2. Starting Water Surface Condition When performing hydraulic analyses for channel or drainageway
design, the starting water surface shall be based on the following criteria. a. When the ratio of the drainage area of the receiving creek (at the confluence location) to the drainage
area of the channel or drainageway being designed is 15 or greater, the 10-year water surface of the receiving creek shall be used as the starting water surface for hydraulic design
calculations. For creeks where the 10-year water surface is not available, the slope-area method will be used for starting design calculations. b. When the ratio of the drainage area
is less than 15, the 100-year elevation on the receiving creek shall be used as the starting water surface for design calculations. 3. Easements Required for Open Channels Drainage and/or
floodway easements for all open channels, creeks and flumes shall be dedicated to the City of Carrollton. Easements shall encompass all areas having a ground elevation below the higher
of one foot above the water surface elevation associated with the design flood or the top of the high bank or channel edge. In all cases, the easement shall also include at least a ls-foot
wide maintenance strip along both sides of the channel or, if the City Engineer so allows, at least a 20foot wide maintenance strip along one side of the channel. Streets, alleys, bike
paths, etc., alongside the channel can serve as all or part of the maintenance easement. Drainage easements for flumes shall be located with sufficient width to permit future maintenance
accessibility, and in no case shall be less than 15 feet wide. SECTION B. Lakes and Dams In the event that a property owner or developer desires to modify an existing pond or lake or
desires to impound storm water by filling or constructing an above-ground dam, thereby creating a lake, pond, lagoon or basin as part of the planned development of that property, the
criteria listed below shall be met before City approval of the impoundment can be given. Ponds or lakes created by excavation of a channel area without erecting a dam above natural 36

ground elevation or instream, low water checkdams are also subject to the criteria listed below, with the exception of spillway capacity requirements. The City Engineer has the final
authority to determine the design criteria for a proposed dam, checkdam or excavated lake. The requirements of the State of Texas must also be met for the construction of dams, lakes,
and other 􀁩􀁭􀁰􀁯􀁵􀁮􀁤􀁾􀀠ments. The design criteria for a dam is dependent on the size and hazard classification of the dam. The size and hazard classification will be based on the
Recommended Guidelines for Safety Inspection of Dams (ER 1110-2-106, September 26, 1979) prepared by the U.S. Army Corps of Engineers, and will be determined by the City Engineer based
on information furnished by the owner. The following criteria will be used to classify a dam: 1. Size The classification for size is based on the height of the dam and storage capacity,
whichever gives the larger size category.. Height is defined as the distance between the top of the dam (minus the freeboard) and the existing streambed at the downstream toe. Storage
is defined as the maximum water volume impounded at the top of the dam (minus the freeboard). Size Classification Impoundment Category Storage (acre-feet) Height (feet) Minor <100 <10
Small > 100 and < 1,000 > 10 and < 40 Intermediate > 1,000 and < 50,000 > 40 and < 100 Large > 50,000 > 100 2. Hazard Potential The hazard potential for a dam is based on the potential
for loss of human life and property damage downstream from a dam in the event of failure. The following categories will be used: Hazard Potential Classification Loss of Life Economic
Loss Category (Extent of Development) (Extent of Development) Low None expected (No perMinimal (Undeveloped to manent structures for occasional structures human habitation) or agriculture)
Significant Few (No urban developAppreciable (Notable ments and no more than agricultural, industry, a small number of inhaor structures) bitable structures) High More than few Excessive
(Extensive community, industry, or agriculture) 37 
3. Spillway Design Flood The classification of a dam based on the above criteria will be used to determine the Spillway Design Flood (SDF). The total capacity of a dam structure, including
principal and emergency spillways, shall be adequate to pass the SDF wi thout exceeding the top dam elevation. The SDFs for various dam classifications are as follows: Spillway Design
Flood Hazard SDF Low Minor lOO-year Small lOO-year Intermediate SOO-year Large SPF Significant Minor 10O-year Small SOO-year Intermediate SPF Large PMF High Minor SOO-year Small SPF
Intermediate PMF Large PMF In all cases, the 􀁭􀁾􀁮􀁾􀁭􀁵􀁭􀀠principal spillway design capacity is the 100year design flood. In certain cases, a dam breach analysis may be required to
determine the proper classification of the structure. For all structures requiring a spillway design flood equal to the PMF, a dam breach analysis is required to determine the downstream
consequences of a failure. All dams shall be constructed with a freeboard of two feet above the SDF elevation. 4. Additional Design Requirements a. An engineering plan for such construction,
accompanied by complete drainage design information and sealed by a registered professional engineer, shall have been approved by the City of Carrollton; b. The spillway and any emergency
overflow areas shall be located so that flood waters will not inundate any buildings, roadways, or other structures. c. All Federal, State and County laws pertaining to impoundment of
surface water shall have been complied with, including the design construction and safety of the impounding structure. Copies of any Federal, State, and County permits issued for the
proposed impoundments shall be submitted to the City Engineer. d. Any existing structure, which is included in the project area shall be improved to comply with the applicable Federal,
State, County and City safety requirements for structures. 38 
e. Before removing. enlarging. or altering any existing lake. the Owner will furnish a study of the effects of the alteration upon flooding conditions both upstream and downstream. The
study shall be prepared by a professional Engineer and submitted to the City for approval prior to making the proposed alteration. Compensatory storage shall be provided in some manner
such that equal or comparable flood retention capacity is maintained. f. Any improvements to existing dams or lakes or construction of new impoundments shall be made at the expense of
the developer, prior to acceptance of the adjacent street, utilities and drainage improvements as provided for under the Subdivision Ordinance. 5. Maintenance and Liability Criteria
a. The owner or developer shall have agreed to retain private ownership of the lake, pond, or lagoon or basin constructed and to assume full responsibility for the protection of the
general public from any health or safety hazards related to the lake, pond, or lagoon constructed. b. The owner or developer shall have agreed to assume full responsibility for the maintenance
of the lake, pond, or lagoon or basin constructed. The owner or developer shall keep the Director of Public Works advised of the current responsible agent for this maintenance. SECTION
C. Levees In the event that developers or owners wish to build levees to protect an area from flooding, applicable FEMA and State of Texas gUidelines and the following criteria apply:
1. Levees shall be designed to have four feet of freeboard above the Standard Project Flood for the fully developed watershed flows. 2. Levees shall be designed according to the Corps
of Engineers design criteria whether or not they are federally authorized levees. 3. Levee systems shall be designed with interior drainage systems to prevent flooding from local runoff
contained within the system for the lOO·year design flood. 4. Levee systems shall have written operation procedures that address gate closure conditions and emergency warning plan. A
copy of these procedures shall be furnished to the City Engineer and the Director of Public Works. S. Automated gate closure systems shall have power from two independent sources and
shall be capable of being operated manually. 6. Ring levees protecting individual structures proposed for construction after the enactment date of this ordinance shall not be permitted.
39 
7. All new levee systems shall have permanent positive closures to the required design elevation. Temporary closures involving sandbagging or other procedures requiring manual operations
shall not be permitted. 8. Provisions shall be made for ensuring the permanent maintenance of levees either by a flood control district or similar governmental organization or by the
existing property owner and all future owners, heirs, or assigns. 9. Additional plan requirements include water surface profiles for the design flood and SPF; top of levee profile, definition
of interior drainage facilities, including pump station and ponding areas; location of gravity outlets, gatewells and closure structures; and elevation-duration data on the receiving
system. SECTION D. Detention and Retention Facilities As previously described in Article 5 of this ordinance, runoff rates shall be limited to the rates that would be produced from single
family residential areas. Detention/retention facilities to reduce runoff rates will be provided within approved levee districts as deemed necessary by the City Engineer. Detention/retention
facilities shall be designed for the 100-year design flood according to the follOWing criteria. 1. The minimum amount of storage volume of the detention basin shall be that volume required
to reduce runoff rate to a single-family rate. Dedicated detention/retention basins shall also include an additional one foot of freeboard and two feet of sediment storage. The volume
of runoff storage for drainage areas greater than 160 acres shall be computed using unit hydrograph procedures. Acceptable unit hydrograph procedures include the Soil Conservation Service
Dimensionless Unit Hydrograph and Snyder's Unit Hydrograph. Manual methods or use of the computer programs TR20, HEC-l, and NUDALLAS are allowed for runoff hydrograph computation and
flood routings. For drainage areas less than 160 acres, the above methods are recommended; however, an approximate routing method based on the rational formula is allowable, as outlined
in Figure 24. 2. Detention areas in parking lots shall not be: In required parking spaces but in extra spaces. Behind speed bumps unless the speed bumps are made with reinforced concrete.
Deeper than six inches unless warning signs are posted. 3. Drainage easements shall be provided for all regional detention/retention facilities and for other detention/retention facilities
where two or more owners are involved. 4. Detention/retention facilities shall be designed to empty in less than 24 hours, unless it is also serving as an erosion control facility. 40

5. Detention/retention facilities shall not be counted as an erosion control technique unless (1) the basins are designed to empty a minimum of 24 hours from the storm event and (2)
adequate sediment storage areas in the basin have been set aside and are maintained. Other municipal ordinances give additional details as to how to design mUlti-purpose detention/retention
facilities. 6. Detention/retention facilities shall be maintained by the owner unless the facilities are dedicated to the City of Carrollton. SECTION E, Flumes The use of flumes is not
recommended for widespread use. Flumes shall not be permitted when the purpose of a permanent flume is to carry runoff down the sides of earthen channels. A flume may be used to direct
overflow runoff along property lines until the runoff can be intercepted by streets or conduit flows. Flumes crossing sidewalks shall be covered or bridged such as to minimize danger
to pedestrians, SECTION F. Connections from Buildings to StoDll Sewers Drainage from residential areas, such as roof tops, should be allowed to flow overland before joining the storm
sewer system. Seepage into basements that is pumped to ground level, seepage from springs, and runoff from roof drains on non-residential buildings that would flow onto or across driveways,
sidewalks t or other areas commonly crossed by pedestrians can create hazards or nuisances to pedestrians, Thus, if hazards or nuisances would be created, the basement and rooftop drains
shall be tied directly to the nearest storm sewer, provided that pumped lines from basements have backflow preventers. 41 
ARTICLE 8 FLOODPLAIN GUIDELINES SECTION A. Lands to lIhich This Article Applies A person shall comply with the requirements of this article for floodplain areas before making substantial
improvements to or increasing the outside dimensions of an existing structure or developing land within the design flood line of a creek or stream having a contributing drainage area
of 160 acres or more, whether or not the land has been formally designated as a floodplain. Floodplain areas shall also include all areas inundated by the design flood and shown as Areas
of Special Flood Hazard on the Flood Insurance Study's maps. SECTION B. General Floodplain Regulations 1. Permitted Uses of Floodplain Areas To minimize possible losses of life and property,
the following uses are permitted in a floodplain area provided they are also permitted in the underlying zoning district: Farm or ranch; Local utilities, electrical substation, water
reservoir or pumping station. and water treatment plant; Public park or playground, private private recreation club or area, private community center, and golf course; -Outside commercial
amusement approved by a specific use permit; -Helistop approved by a specific use permit; and -Radio, television. or microwave tower; and amateur communications tower with a special
use permit. Structures customarily associated with the above uses may be constructed within a floodplain area only if the proposed structure meets the same engineering requirements applicable
to filling in a floodplain (See Article S.C). Open private recreation clubs or areas and private community centers, without exterior walls which would incur structural damage during
flood conditions. are permitted in floodplain areas. Private facilities listed above. with enclosed walls that would incur damage, are not permitted in floodplain areas. Uses and structures
other than those mentioned above shall not be permitted in floodplain areas. 42 
2. Residential Construction New construction in reclaimed floodplain areas and "substantial improvements" of any existing residential structure in floodplain areas shall have the lowest
floor, including basements or fully enclosed areas, elevated to at least two feet above the design flood elevation. Fill elevations shall be one foot above the elevation of the design
flood. Incremental improvements, either at one time or over a period of time, the cumulative cost of which equals or exceeds 50 percent of the market value at the time of the first improvement,
shall be considered as a "substantial improvement." New residential structures on stilts or behind ring levees serving individual lots shall not be permitted. Improvements to an existing
structure that increase the outside dimensions, but do not result in a "substantial improvement,tI must meet the requirements of Article S.C. Table 10 presents a synopsis of the requirements
for residential construction in floodplain areas. 3. Non-residential Construction New construction in reclaimed floodplain areas and "substantial improvement" of any existing commercial,
industrial, or other non-residential structure in floodplain areas shall either have the lowest floor, including basements, elevated to at least two feet above the design flood elevation;
or, together with attendant utility and sanitary facilities, shall: Be floodproofed so that below two feet above the design flood elevation the structure is watertight, with walls substantially
impermeable to the passage of water; Have strUctural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and • Be certified by a registered professional
engineer or architect that the standards of this subsection are satisfied. Such certifications shall be provided to the offical set forth in Article 4, Section A.I. Incremental improvements,
either at one time or over a period of time, the cumulative cost of which equals or exceeds 50 percent of the market value at the time of the first improvement, shall be considered as
a "substantial imprOVement." ImprOVements to an existing commercial, industrial or other non-residential structure that increase the outside dimensions, but do not result in a "substantial
improvement," must meet the requirements of Article S.C. Table 10 presents a synopsis of the requirements for nonresidential structures in floodplain areas. 43 
4. Manufactured 􀁾􀀠a. All manufactured homes shall be anchored to resist flotation, collapse, or lateral movement by providing over-the-top and frame ties to ground anchors. Special
requirements shall be that: Over-the-top ties be provided at each of the four corners of the manufactured home, with two additional ties per side at intermediate locations, with manufactured
homes less than 50 feet long requiring one additional tie per side; Frame ties be provided at each corner of the home with five additional ties per side at intermediate points, with
manufactured homes less than 50 feet long requiring four additional ties per side; -All components of the anchoring system be capable of carrying a force of 4,800 pounds; and, Any additions
to the manufactured home be similarly anchored. b. For all new manufactured homes, new manufactured home parks and manufactured home subdivisions; for expansions to existing manufactured
home parks and manufactured home subdivisions; for existing manufactured home parks and manufactured home subdivisions where the repair, reconstruction or improvement of the streets,
utilities and pads is planned; and for manufactured homes not placed in a manufactured home park or manufactured home subdivision; for new manufactured homes moved into an old site in
an existing manufactured home park; and for substantial improvements to a manufactured home, require that: Stands or lots are elevated on compacted fill so that the lowest floor of the
manufactured home will be at least two feet above the design flood elevation; -Adequate surface drainage and access for a hauler are provided; and, . \ I • No new manufactured homes
shall be placed in a floodplain, except on a pad site created by compacted fill in an existing manufactured home park. in which the new pad site is elevated at least two feet above the
design flood elevation. Table 10 overviews the requirements for placing manufactured homes in flood hazard areas. 5. Streets, Parking Lots, and Bridges The top of curb of all neW streets
to be built in reclaimed floodplain areas shall be at least one foot above the design flood elevation. The low beam of all new bridges to be constructed across floodplains shall be a
minimum of one foot above the design flood elevation. All new private bridges to individual homes shall have their low beams at one foot above 44 
the design flood elevation. Parking lots associated with residential, commercial and industrial uses in reclaimed floodplain areas shall be at least at the design flood elevation. Parking
lots for public parks or playgrounds, private recreation club or area, private community center and golf courses may be located below the design flood elevation. 6. Utilities All new
and replacement water supply systems, sanitary sewer facilities, and other public utilities shall be designed to minimize or eliminate flood damage and infiltration of flood waters into
the system. 7. Fences Fences (Private and Public Screening) shall be constructed such that blockage of surface water flow does not occur. Fences shall not be allowed in floodplain area.
This includes the requirement that erosive conditions shall not be created around, under or near a fence structure. 8. Additional Construction Standards for Structures All improvements
and construction permitted in a floodplain area must comply with the following requirements: a. Structures must be securely anchored to the foundation to prevent flotation and collapse
during inundation and designed to prevent damage to nonstructural elements during inundation. b. Thermal insulation used below the first floor elevation must be of a type that does not
absorb water. c. Adhesives must have a bonding strength that is unaffected by inundation. d. Doors and all wood trim must be sealed with a waterproof paint or similar product. e. Mechanical,
electricial, and utility equipment shall be located above the design flood elevation. Water heaters, furnaces, electrical distribution panels, and other critical mechanical or electrical
installations must not be placed in basements. Electrical circuits for basements shall be separate from circuits serving floors above the basement, and circuits for basements shall be
installed lowered from above. f. Basements are permitted for non-residential structures only if they are designed to preclude inundation by the design flood elevation, either by: 1.
The The elimination of exterior openings below the design flood elevation; or 45 
2. The use of waeer-tight closures, such as bulkheads and flood shields. However, no basements are permi tted in so Us whose permeability meets or exceeds the minimum local standards
of permeability established for the installation of individual sewage disposal systems. g. Plywood used at or below the lowest floor elevaeion must be of an "exterior" or "marine" grade
and of a water-resistane or waterproof variety. h. Wood flooring used at or below ehe lowest floor elevation must be insealled to accommodate a lateral expansion of the flooring, perpendicular
to the flooring grain, without incurring structural damage to the building. i. Basement ceilings for non-residential structures must be of sufficient wet strength and be so installed
as to survive inundation. j. Paints or other finishes used at or below the lowest floor elevation must be capable of surviving inundation. k. All air ducts, large pipes and storage tanks
located at or below the lowest floor elevation must be firmlY anchored to prevent flotation. 1. Tanks must be vented at a location above the design flood elevation. SECTION C. Floodplain
Alterations As stated previously in Article 8, Section B, no new construction is allowed in flOOdplain areas, but construction is allowed in those areas that can be reclaimed from the
floodplain. The City of Carrollton has adopted a "naeuralfloodway" that differs from the "regulatory floodway" established by FEMA. The "natural floodway" consists of the natural channel and floodplain that is effective in conveying the design
flood. Areas of ineffective flow around bridges, topographic constrictions, and other constrictions are excluded from the "natural floodway." The effective flow area and limits of the
"natural floodway" are determined using 4:1 flow expansions downstream of constrictions and 1:1 flow expansions upstream of constrictions. Figure 25 displays an example of effective
flow areas at a typical bridge location. A FlOOdplain Alteration Permit for floodplain reclamation or other types of alterations shall be allowed only if all of the following criteria
are met: 1. Alterations of the floodplain and "natural floodway" shall not increase the water surface elevation of the design flood of the creek. 2. Alterations shall be in compliance
with FEMA guidelines. 3. Alterations of the floodplain shall not: create an erosive water velocity on or off-site. 4. Alterations of the floodplain shall not significantly increase downstream
discharges. 46 
5. The effects of existing improvements or public and private improvements for which a future commitment has been made by the City of Carrollton or county, state, or federal agencies.
shall be used in determining water surface elevations and velocities. 6. Any alteration of floodplain areas shall not cause any additional expense in any current Or projected public
improvements. 7. The floodplain shall be altered only to the extent permitted by equal conveyance on both sides of the natural channel. The right of equal conveyance applies to all owners
and uses, including greenbelt, park areas, and recreational usages. Owners may relinquish their right to equal conveyance by providing a written agreement to the City of Carroll􀁴􀁯􀁮􀁾􀀠8.
Maximum slopes of filled areas shall not exceed three to One. Slopes of any excavated areas not in rock shall not exceed four to one. Fill slopes, vertical walls, terracing, and other
slope treatments may be considered provided no unbalancing of stream flow results and only as a part of a grading permit application. 9. A grading permit shall be required so that proper
provisions for protecting against erosion losses will be made. These criteria shall be met before a Floodplain Alteration Permit can be issued for a proposed project. Typical projects
requiring a Floodplain Alteration Permit include placing fill whether or not it actually raises the property out of the floodplain. constructing a dam, straightening channel sections,
making improvements, substantial or otherwise, to existing structures in a floodplain in which the existing outside dimensions of the structure are increased, and temporary storage of
fill materials, supplies, and equipment. The required submittals for a Floodplain Alteration Permit are listed in Article 4, Section D.2. In general, the information needed for the application
can be obtained by running a backwater model, such as HEC-2, and a flood routing model, such as Tll.-20 or HEC-I. Both models shall be run by permit applicants. The backwater information
shall be used to determine that upstream water surface elevations and erosive velocities have not increased. Starting water surface conditions for backwater calculations are outlined
in Article 7, Section A.2. Flood routing information shall be used to insure that the cumulative effects of the reduction in floodplain storage of floodwaters will not cause downstream
increases in water surface elevations and eros i ve velocities. Applicants can obtain copies of the' existing conditions backwater models and flood routing where available from the City
Engineer. The City Engineer shall keep the models current with modifications to the floodplain. SECTION D. Verification of Floodplain Alterations_ Prior to final acceptance by the City
of utilities and street construction for projects involving floodplain alterations or adjacent to defined floodplains, creeks, channels and drainageways, a certified statement shall
be prepared by .",. 47 
a Registered Public Surveyor showing that all lot elevations, as developed within the subject project, meet or exceed the required minimum finished floor elevations shown on the final
plat of the subdivision. This certification shall be filed with the City Engineer. In addition, at any time in the future when a building permit is desired for existing platted property
which is subject to flooding or carries a specified or recorded minimum finished floor elevation, a Registered Public Surveyor shall survey the property prior to obtaining a building
permit. The certified survey data showing the property to be at or above the specified elevation shall be furnished to the City Engineer for approval. Certificate of compliance with
the provisions of this ordinance pertaining to specified finished floor elevations shall be required. The owner/developer shall furnish, at his expense, to the City Engineer sufficient
engineering information to confirm that the minimum floor elevations proposed are as required by this paragraph. Construction permits will not be issued until (1) a conditional letter
of map revision or amendment has been issued by FEMA, and (2) lots and/or sites are certified by a Registered Public Surveyor and are elevated from the floodplain according to the FEMA-approved
revisions to the floodplain and the requirements of this ordinance. 48 
TABLE 1 VALUES OF "C" FOR USE IN "RATIONAL METHOD" FORMULA 9.:: CIA Value of ne u (Runoff Land Use from Master Plan Coefficient) Flat 0% to 1% Park areas -No developable land 0.20 Park
and School land Tract 0.30 Single Family Residential 0.45 Duplex 0.50 Multiple Family 0.55 Local Business 0.65 Central Business 0.80 Commercial 0.80 Industrial 0.75 Moderate 1% to 3.5%
Park areas -No developable land 0.30 Park and School land Tract 0.40 Single Family Residential 0.55 Duplex 0.60 Multiple Family 0.70 Local Business 0.70 Central Business 0.85 Commercial
0.85 Industrial 0.80 Steep 3.5% and over Park areas -No developable land 0.35 Park and School land Tract 0.45 Single Family Residential 0.65 Duplex 0.70 Multiple Family 0.80 Local Business
0.90 Central Business 0.90 Commercial 0.90 Industrial 0.90 49 
TABLE 2 AVERAGE VELOCITY FOR USE IN DETERMINING TIME OF CONCENTRATION 0% to 3% 4% to 7% 8% to 11% Over 12% Description of V. in V. in V. in V. in Water Course f.p.s. f.p.s. f.p.s. f.p.s.
Surface Drainage 5 9 13 15 Channels Determine V. by Manning's Equation Storm Sewers Determine V. by Manning's Equation TABLE 3 MINIMUM SLOPES FOR CONCRETE PIPES (n -.013) Pipe Diameter
Slope Pipe Diameter Slope (inches) (Feet/lOO Feet) (inches) (Feet/lOO Feet) 51 .045 18 .180 54 .041 21 .150 60 .036 24 .120 66 .032 27 .110 72 .028 30 .090 78 .025 33 .080 84 .023 36
.070 90 .021 39 .062 96 .019 42 .056 102 .018 45 .052 108 .016 48 .048 50 
TABLE 4 MAXIMUM VELOCITIES IN CONDUITS FLOWING FULL AND CHANNELS Flow Through: Maximum Velocity {fEs) Culverts 12.5 Inlet Laterals 10 Storm Sewers 12.5 Earthen Channels See Table 11
Concrete Channels 12 Shale 6 Rock 6 10* * Depends upon exact type of vegetative cover, soil, or rock for the location in question. TABLE 5 ROUGHNESS COEFFICIENTS FOR CLOSED CONDUITS
Recommended Roughness Coefficient Materials of Construction Ifn" Concrete Pipe Storm Sewer Good Alignment, Smooth Joints .013 Fair Alignment, Ordinary Joints .015 Poor Alignment, Poor
Joints .017 Concrete Pipe Culverts .012 Monolithic Concrete Culverts & Conduit .(llZ Corrugated Metal Pipe .024 Corrugated Metal Pipe (Smooth Lined) .013 51 
TABLE 6 ENTRANCE LOSS COEFFICIENTS 2v1Entrance head loss HL -Ke 2g Type of Structure and Design of Entrance Coefficient Ke Pipe, Concrete Projecting from fill, socket end (groove-end)
0.2 Projecting from fill, square cut end 0.5 Headwall or headwall and wingwalls Socket end of pipe (groove-end) 0.2 Square-edge 0.5 Rounded (radius -1/12D) 0.2 Mitered to conform to
fill slope 0.7 End-section conforming to fill slope 0.5 Beveled edges, 33.7' or 45" bevels 0.2 Side-or slope-tapered inlet 0.2 Pipe, 2f Pipe-Arch, Corrugated Metal Projecting from fill
(no headwall) 0.9 Headwall or headwall and wingwa11s square-edge 0.5 Mitered to conform to fill slope, paved or unpaved slope 0.7 End-section conforming to fill slope 0.5 Beveled edges,
33.7' or 45" bevels 0.2 Side-or slope-tapered inlet 0.2 Box, Reinforced Concrete Headwall parallel to embankment (no wingwalls) Square-edged on 3 edges 0.5 Rounded on 3 edges to radius
of 1/12 barrel dimension or beveled edges on 3 sides 0.2 Wingwalls at 30' to 75' to barrel Square-edged at crown 0.4 Crown edge rounded to radius of 1/12 barrel dimension dimension,
or beveled top edge 0.2 Wingwall at 10" to 25" to barrel Square-edged at crown 0.5 Wingwall parallel (extension of sides) Square-edged at crown 0.7 Side· or slope-tapered inlet 0.2 52

TABLE 7 VELOCITY HEAD LOSS COEFFICIENTS FOR CLOSED CONDUITS MANHOLE AT CHANCE IN PIPE DIRECTION HEAD LOSS DESCRIPTION ANGLE COEFFICIENT Kj 02 01=02 90" 0.55 01 60· 0.48 45" 0.42 30·
0.30 O· 0.05 BENDS IN PIPES HEAD LOSS DESCRI PTION ANGLE COEFFICIENT Kj 90· 0.50 60' 0.43􀁁􀁎􀁃􀁕􀁾􀀠45· 0.37I 30' 0.25 53 
TABLE 7, continued VELOCITY HEAD LOSS COEFFICIENTS FOR CLOSED CONDUITS JUNCTION HEAD LOSS DESCRIPTION ANGLE COEFFICIENT Kj 22 1/2' 0.75 45' 0.50 60' 0.35 V, Vz 90' 0.25 54 
TABLE 8 ROUGHNESS COEFFICIENTS FOR OPEN CHANNELS FLOW AREAS Roughness Coefficient Channel Description Minimum Normal Maximum MINOR NATURAL STREAMS (Top Width at Flood Stage Less Than
100 Feet) Moderately Well-Defined Channel Grass and Weeds, Little Brush 0.025 0.030 0.033 Dense Weeds, Little Brush 0.030 0.035 0.040 Weeds, Light Brush on Banks 0.030 0.035 0.040 Weeds,
Heavy Brush on Banks 0.035 0.050 0.060 Weeds, Dense Willows on Banks 0.040 0.060 0.080 Irregular Channel with Pools and Meanders Grass and Weeds, Little Brush 0.030 0.036 0.042 Dense
Weeds, Little Brush 0.036 0.042 0.048 Weeds, Light Brush on Banks 0.036 0.042 0.048 Weeds, Heavy Brush on Banks 0.042 0.060 0.072 Weeds, Dense Willows on Banks 0.048 0.072 0.096 Floodplain,
Pasture Short Grass, No Brush 0.020 0.030 0.035 Tall Grass, No Brush 0.025 0.035 0.050 Floodplain, Cultivated No Crops 0.025 0.030 0.035 Mature Crops 0.030 0.040 0.050 Floodplain, Uncleared
Heavy Weeds, Light Brush 0.035 0.050 0.070 Medium to Dense Brush 0.070 0.100 0.160 Trees with Flood Stage Below Branches 0.080 0.100 0.120 MAJOR NATURAL STREAMS (Top Width at Flood Stage
Greater Than 100 Feet) The roughness coefficient is less than that for minor streams of similar description because banks offer less effective resistance. MOderately Well Defined Channel
0.025 0.060 Irregular Channel 0.035 0.100 55 
TABLE 8, continued Roughness Coefficient Channel Description IUnimwn Normal Maximum MANMADE VEGETATED CHANNELS Mowed Grass, Clay Soil Mowed Grass, Sandy Soil, or Easily Erodible Soils
MANMADE NON-VEGETATED CHANNELS Clean Gravel Section Shale Smooth Rock LINED CHANNELS Smooth Finished Concrete Riprap (Larger Pieces) 0.025 0.025 0.022 0.025 0.025 0.013 0.030 0.030 0.035
0.030 0.035 0.025 0.030 0.030 0.035 0.030 0.035 0.015 0.020 0.040 0.050 56 
TABLE 9.A TEMPORARY VEGETATION 􀁔􀁥􀁭􀁰􀁯􀁲􀁾􀁲􀁹􀀠Vegetation -The following plants are commonly used for temporary cover in Texas. For optimum planting dates and adaptations for a specific
soil or site, contact your local field office of the USDA, Soil Conservation Service. Planting 􀁐􀁬􀁡􀁮􀁾􀁩􀁮􀁧􀀠Rate/Acrel Date Source3 Cane, Redtop 30#/5 8/15-9/30 C Millet, German
40#/s 4/1-5/15 C Oats 3 bu/5 8/15-9/30 C Panicum, Texas 25#/5 3/15-5/15 C Prosomillet 40#/5 4/1-5/15 C Rye, Elbon 1-1/2 bU/5 8/15-9/30 C Ryegrass, Annual 30#/5 8/15-9/30 C Sprangletop,
Green 3.4#PLS/S 2/1-5/15 C Sudangrass 40#/S 4/1-5/15 C IPlanting Rate/Acre: S -# Commercial Seed/AC, bu -bushels/AC, #PLS -Pure Live Seed/AG 2Planting Date: This represents a statewide
spread in planting dates, Refer to local guides for specific dates. 3Source: C -Commercial 57 
TABLE 9.S PERMANENT VEGETATION Permanent Vegetation -Because of wide variations in growing conditions within a planned area, permanent vegetation has been selected for the following
conditions. For optimum planting dates and adaptations for a specific soil or site, contact your local field office of the USDA, Soil Conservation Service. Note: Low areas are subject
to ephemeral and intermittent flows. Moisture Planting Species Tolerancel Rate/Materials2 Source4 Bermudagrass, Coastal or Selection 3 A/2 50 cu.ft/Ac/Sp 12/1-5/30 C Common A/2 4.6#/Ac/S
3/1-5/30 C Buffa10grass A/3 32#/Ac/S 1/1-4/30 C or PMC Bushy Beard Grass C/3 Spring Cordgrass, Prairie B/2 l/sq.ft/R 1/1-5/30 L Eastern Gammagrass C/3 Spring Knotgrass A/2 l/sq.ft/R&St
2/1-5/30 L Marshmillet B/1 l/sq.ft/R 4/1-5/30 L Reedgrass, Common A/2 l/sq.ft/R 2/1-5/30 L or FMC Vine-mesquite A/2 l/sq.ft/St 2/1-1/30 L 1Moisture Tolerance: Total Submergence Soil
Saturation A 20 days or more 1 Require a saturated soil B lO -20 days 2 Will tolerate prolonged saturation and frequent drought C Less than 10 days 3 Will not tolerate a constantly saturated
soi1. 2Planting; Rate -#PLS/AC, Plant Parts/sq. ft. Materials -S -Seed, R -Rhizomes, Sp -Sprigs, St -Stolons 3Planting Date: This represents a statewide spread in planting dates. Refer
to local guides for specific dates. 4Source: C -Commercial. L -Locally Collected, PMC -Plant Material Center (as available) 58 
TABLE 9.C PERMANENT VEGETATION -SIDE SLOPES Planting 􀁐􀁬􀁡􀁮􀁾􀁩􀁮􀁧􀀠Species RatejMaterials3 Date SourceS Grasses Bermudagrass, Common All 4.6#/Ac/S 3/1-5/30 C Selection 3 or Coastal
All 50 cu.ft/Ac/Sp 12/1-5/30 C Bluestem, K.R.* M-F 4#/Ac/S 12/1-5/30 C Old Ilorld* M-F 2.4#/Ac/S 2/1-5/30 PMC Buffalograss* M-F 32#/Ac/S 1/1-5/15 C or PMC Dallisgrass M-F 7#/Ac/S 2/1-5/30
C Knotgrassl All l/sq.ft/R&St 2/1-5/30 L Vine-mesquite All l/sq.ft/St 2/1-4/30 L Ilildrye All 25#/Ac/S 9/1-10/1 L Forbs: Bushsunflower* All lO#/Ac/S 4/1-5/20 L or 􀁆􀁾􀁉􀁃􀀠Englemandaisy*l
All 30#/Ac/S 9/1-2/30 L or PMC Legumes: Trailing wildbean* CoM 25#/Ac/S 2/15-5/15 L or PMC Vetch* All 20#/Ac/S 9/1-10/1 C *Mixtures only: Reduce rates according to percentage of mixture
desired. 􀁾􀁌􀁯􀁷􀁥􀁲􀀠portion of slope only, frequently inundated. Soils: C -Coarse, M -Medium, F -Fine 3P1anting: Rate -#PLS/AC, Plant Parts/sq. ft. Materials -S -Seed, R -Rhizomes,
Sp -Sprigs, St -Stolons 4Planting Date: This represents a statewide spread in planting dates. Refer to local guides for specific dates. 5Source: C -Commercial, L -Locally Collected,
PMC -plant Material Center (as available) 59 
TABLE 9.D PERMANENT VEGETATION BERMS, SPOIL llANKS, AND SIMILAR AREAS Species Grasses Bermudagra.ss t Common Selection 3 or Coastal Bluestem, Caucasian* K.R.* Little* Buffalograss* Fescue
Hardinggrass "Wintergreen" Indiangrass* Kleingrass, "Selection 75 t1 * liIildrye* Wintergrass, Texas* Forbs: llushsunflower* Englemandaisy* Partridgepea* Sunflower, Maxlmilian* Soilsl
All All M-F M-F All All M-F M-F All M-F All M-F All All C-M All Planting RatejMaterials2 4.6#/Ac/S 50 cu. ft/Sp 4#/Ac/S 4#/Ac/S 6.8#/Ac/S 6#/Ac/S 20#/Ac/S 6#/Ac/S 9#/Ac/S 4#/Ac/S 30#/Ac/S
30#/Ac/S 10#/Ac/S 30#/Ac/S 10#/Ac/S 16#/Ac/S 60 Plan§ing Date 3/1-5/30 12/1-5/30 12/1-5/30 12/1-5/30 2/1-5/15 2/1-5/15 9/1-10/30 9/1-10/30 2/1-5/30 1/1-5/30 9/1-10/1 9/1-10/30 4/1-5/30
9/1-2/30 2/15-5/15 4/1-5/30 Source4 C C C C C C C C C C L C L or PMC L or PMC C or PMC L or PMC 
TABLE 9.D. continued Planting 􀁐􀀱􀁡􀁮􀁴􀁩􀁾􀁧􀀠Species Soilsl Rate(Materials2 Date Source4 Legumes: Clover, Crimson* M 20#/Ac/S 9/1·10/30 C White* M-F 3#/Ac/S C Trailing wildbean* CoM
10#/Ac/S 2/15-5/15 PMC Vetch* All 20#/Ac/S 9/1-10/1 C *Mixtures only: Reduce rates according to percentage of mixture desired. ISoi15: C -Coarse. M -Medium. F -Fine 2Planting: Rate -#PLS/AC,
Plant Parts/sq. ft. Materials -S • Seed, R -Rhizomes, Sp • Sprigs, St . Stolons 3Planting Date: This represents a statewide spread in planting dates. Refer to local guides for specific
dates. 4source: C -Commercial, L -Locally Collected, PMC • Plant Material Center (as available) 61 
TABlE 10 SYNOPSIS OF RlOC)UIIID!ENTS TO PROTECT STRUCTURES FROM FLOODING I I Is a I I Is I.o>Jest I Is Floodproofing I I I Develop-I Is a Floodplain I Floor Req'd I 􀁁􀁬􀁬􀁾􀀠as an I
I I IDmt I Alteration Pemit I To Be 2 Feet I Alternative to I I I Pennit I Required? I />bove Design I I.o>Jest Floor I I I Req'd? I I Flood Elav.? I Requiremmt? I I I I I I I I I I
I I I I RESIDENTIAL I I I I I I I I I I I I New Structure I Yes I Yes, if rew structures I Yes I No I I I I are being placed in a ! I I I I I proposed floodplain I I I I I I reclamation
area. I I I I I I I I I I Substantial improvement (Le., I Yes I Yes, if structure is I Yes I No I I value of rerovation of existing I I subject to flooding. I I I I structure is greater
than 50% I I I I I I of tM structure). I I I I I I I I I I I I Rerovation valued at less than I No I No I No I Floodproofing is I I 50% of the structure's value, I I I I allowed, but
rot I I with no expansion of outside I! I I required. I I <lliIEnsions. I I I I I I I I I I I I Rerovation valued at less than I Yes I Yes, if structure is I No I Floodproofing is I
I 50% of the structure's value, I I subject to flooding. I I allowed, but rot I I but ircltiling expansion of out-I I I I required. I I side <lliIEnsiors. I I I I I I I I I I 62 
􀁾10, continued I I Is a I I Is u-st I Is Floodproofing I I I Develop-I Is a Floodplain I Floor Req' d I All"""-ld as an I I I men!: I Alteration Pennit I To Be 2 Feet I Alternative
to I I I Pennit I Required? I NxJve Design I u-st Floor I I I Req'd? I I Flood Rlev.? I Req.rlIemmt? I I 1___,1 1 1 1 1 1 I 1 1 I I lnI-RESIDI'NI'IAL I I I I I I I I I I I I New Structure
I Yes I Yes, if new structures I Yes 1 Yes I I I I I I are being placed in a I I proposed floodplain I I I I I I I I reclamation area. I I I I I I Substantial improvement (Le., I Yes
I I Yes, I if structure is I Yes I I Yes I I I value of rernvation of existing I I siliject to flooding. I I I I s=ture is greater than 50% I I of the structure). I I I I I I I I I I
I I I I I I Rerovation valued at less than I No I No I No I Floodproofing is I I 50% of the structure's value, I I I I allowed, wt rot I I with no e><pansion of outside I I I I required.
I I d.i.nensions. I I I I I I I I I I I I Rerovation valued at less than I Yes I Yes, if structure is I No I Floodproofing is I I 50% of the structure's value, I I siliject to flooding.
I I allowed, wt rot I I but !nclWing expansion of out-I I I I required. I I side d.i.nensions. I I I I I I I I I I I 63 
IABLE 10, continued I I Is a I Is lDI.>ast I Is Floodproofing I I I Develop-I Is a Floodplain I Floor Req'd I Allowed as an I I I IlElt I Alteration Petmit I To Be 2 Feet I Alternative
to I I I Petmit I Required? I l\l:x:roe Design I lowest Floor I I I Req'd? I I Flood Elev.? I RequirenEnt? I I I I I I I I I I I I I I MANUFACl1B.ID 􀁾􀀠I I I I I I I I I I I I New haDe
placed at 8fl!{ pad site I Yes I Yes, if new romes are I Yes I lb I I I I being located in a I I I I I I proposed floodplain I I I I I I reclamation area. I I I I I I I I I I Expansion
of an existing home I Yes I Yes, if the park is in I Yes I lb I I park I I a floodplain area. I I I I I I I I I I New haDe park I Yes I Yes. if the new park I Yes I lb I I I I is being
located in a I I I I I I proposed floodplain I I I I I I area. I I I I I I I I I I SUbstantial impr""""""",ts to an I Yes I Yes, if the pad site I Yes I lb I I 􀁾􀀮􀁸􀁩􀁳􀁴􀁩􀁮􀁧􀀠marufac=ed
haDe I I for the home is in a I I I I I I flood Mzard area and I I I I I I the pad is being I I I I I I raised or exparDed I I I I I I I' , I Remvation valued at less than I lb I lb
I lb I lb , I 50% of the maruf.actured home's I I I I I I val.... , with ro ""I"""'ion of the I I I I I I home's or pad's rutsids dimen-I I I I I I SiOllS. I I I I I I I I I I I I Remvation
valued at less than I Yes I Yes, if structure is I lb I lb I I 50% of the marufac=ed rome's I I S<bject to flooding. I I I I value, b.Il: irelu::ling ""I"""'ion I I I I I I of its o..Itsids
dimensiOllS. I I I I I I I I I I 64 
__________________ _____ _ TAlILK 11 PERMISSIBLE VELOCITIES FOR CHANNELS LINED WITH GRASS 1 1 Permissible Velocity, fps1 t__________􀁾__--1 COVER Slope Range, t Erosion1 Easily 1 % 1
resistant 1 Eroded I1 11 Soils 11 Soils 1 1 1 1 Bermuda Grass 0-5 1 8 1 6 1 5-10 1 7 1 5 1 >10 I 6 1 4 1 1 1_____ 1 1 1 I Buffalo grass, Kentucky bluegrass, 0-5 I 7 1 5 1 smooth brome,
blue grama 5-10 1 6 1 4 I >10 I 5 1 3 1 1 1___ 1 I 1 1 Grass mixture O-S 1 5 I 4 1 5-10 1 4 1 3 , Do not use on slopes steeper than 10, , 1 , ,-----------!, 1 Lespedeza sericea, weeping
love 0-5 1 3.5 1 2.5 , grass, ischaemum (yellow blue-Do not use on slopes steeper than 5%, 1 stem), kudzu, alfalfa, crabgrass except for side slopes in a combination , channel. 1--_____--------------
---,__----__1--_--1 1 I 1 Annuals -used on mild slopes or 0-5 1 3.5 I 2.5 1 as temporary protection until per-Use on slopes steeper than 5% is not 1 manent covers are established, recommended.
1 common lespedeza, Sudan grass 1______--------____________________ Remarks: Remarks: The values apply to average, uniform stands of each type of cOVer. Use velocities exceeding 5 fps
only where good covers and proper maintenance can be obtained. 65 
fiGURE 1 CITY Of CARROLLTON RAINfALL INTENSI1'Y VALUES 1Q 9 7 6 5 􀁾􀁈􀁴􀁾􀁾􀁒􀁭􀁍􀁲􀁰􀁲􀁾􀁾􀁾􀁾􀁾􀁩􀁦􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁏􀁾􀁾􀁬􀁬11 DEVELOPED FROM 10 NAT10HAL WEATHER
SEJIVICE RAINfALL FREQUENCY DATA IN 'reCHNlCAL PAPERS: NWS HYDRo-n• .lUNE 1977 (5 TO 60 MINUT! 9 DURATlOHS) AND TECHHICAL PAPER NO. 40. MAY lMI 7 6 4 3 II: ::> 0 % = 11.1 ... '" 11.1:c
<.J :z:-e; >...-'" :z: .... fa z .... .... ..: .... :z: ..:.. RAINFALL INTENSITY UN./HR.l STORM DURATION (MINUTES) 5 10 11 30 120 110 360 5.94 4.92 4.16 2.92 1.88 1.11 0.14 0.50 6.96
5.76 4.92 3.56 2.35 1.52 1.11 0.66 7.68 6.42 5.44 4.02 2.61 1.79 1..111 0.79 8.76 7.32 6.21 4.70 3.16 2.10 1.U 0 9.72 8.10 6.88 5.:12 S.SS 2.SS 1.1' 1.05 0.50 8.82 7.52 5.74 S.90 2.61
1.91 1.17 10 15 20 30 40 50 200 RAINFALL DURATION IN MINUTES "'''' 4 STORM 1 EQUENCY (YEARSI.9 2 .8 5 10 .1 25 .6 50 100 .$ 5 
CAPACITY OF TRIANGULAR GUTTERS FIGURE 2 EXAMPLE KNOWN: SOLUTION: MAJOR THOROUGHFARE, TYPE M6D ENTER GRAPH AT .5' PAVEMENT WIDTH: U' INTERSECT CROSS SLOPE: 3/8"/1' GUTTER SLOPE : 2.0llO
INTERSECT GUTTER SLOPE: 2.0llO PAVEMENT CROSS SLOPE: 3""/1' READ GUTTER CAPACITY: 23.5 c.f••• DEPTH Of GUTT ER FLOW: .,' FIND: GUTTER CAPACITY GUTTER CAPACITY IN C.F.S. .5 1 2 a 4 5
10 20 30 40 IO( ---,-.,-" Ilil 􀁾􀁈􀁦􀀠I , I I I , i . /i , I ii ' " I , 􀁾􀀠I ! i I 􀁉􀁁􀁾􀀠I • I 1/, : ' /I ' ! ' ' , ;.." oj:1 i I 􀁢􀁾􀀠,I; ) /: , I . , l I ! I i ! : I ' • 1-1 J.
" 􀁾􀀠. , i it"" , I-. i I 􀀺􀀡􀁾􀀠:; IRIII :/􀁬􀁾􀀺􀀠(, VI ! 􀀺􀁉􀁾􀀠I , I i.i I ' ,.;..r , ; tv, , V ./1/' '1+' ,: : , i I,'::/,J; ; /' , . 􀁬􀁾􀁩􀁽􀀠v 1. illi ! 1/./i i, r[: ' I I
Ii, i j. ./I :j 􀀮􀁾􀀮􀁾􀀠􀁾':I' , ! , V //.. Ii, , IIJ', I /.t II I I ! .jVI /cjlY t ! I , i : ill 1 v >" i'l I.... -; I iii Vv ' .i' I )ll/V v ' , j'.􀀧􀁾􀁴􀀬􀀠',I ·e If" .if 􀁾􀀠I
v 1/rri! :i I . I /1/1/I .2 .3 .4 .5 􀁉􀁾􀀠1, i, 1J)'f 􀁾􀁔n; , I' -, 􀀮􀁾I, , , I I ::j I !' ;j " 􀁾􀀠i i , , ! : i! i j"'!";r.... '.I . ,, -+1], I ,. 7t1 DEPTH OF GUTTER FLOW IN FEET
Note: Does not include additional capacity for area 1 inch above top of curb. 􀀺􀁾􀀧􀀺􀀬􀀺􀀬􀀠':;':':::.' ..,.. ','," .'_ "" :: +..r DEPTH OF CROS'S· S'.. , , 􀀬􀀺􀀻􀀺􀀺􀀬􀀺􀁾􀀺􀀺􀀺􀀺􀁜􀁾􀀮􀀢􀀢􀀮􀀺􀀠
1 GUTTER FLOWLOPE_.. •··· (ROUGHNESS COEFFICIENT. : .0171<\ 67 .1 
LO. " I-LO.4" HO.2'.r-LO.6' 􀀧􀀭􀀭􀁯􀀮􀁾􀀭􀀭􀀭􀀭􀀭􀀭􀀧􀀠I-LO.4-!-JoO.6' 􀁾􀁕􀀠HO,2" HO.4" HO.6' HO." 􀁴􀁉􀁾􀀱􀀠------------STREET WIDTH 26' 36' 0.0 . 50 40 􀁾􀀢􀀧......... SO ... ......
Z .... .. 20 ::; ' ....,""",... 0.. 10 ... -lI. I 6 5 HO.4' 4 S '" 2'" 1 0.1 0.6 0.5 0.4 0.3 0.2 --_........ ,HO.60 􀁾..-....---0.1MAX ,Illa:'":::>'"IJ:::>IJ ffi :J -0=...! ..1-􀁾􀀭􀁦􀁾"
...... :.:.':,. 􀀺􀁾􀀮􀀻......;j.:..": 􀀺􀀮􀀺􀁾􀀮􀀺􀁟􀁾􀀺􀁾􀀻􀁾􀀮􀀠􀁾􀀢􀀮􀀧􀀠.'" ................... .. • -:'1 EXAMPLE: KNOWN: RESIDENTIAL STREET, PAVEMENT WIDTH: 26'iCI Z GUTTER SLOPE:
1,0$0 ... 1:l ............ GUTTER DIFFERENCE: 0.6' '" ...Fit'D: ::i GbTTER CAPACITY OF HIGH CUR8 ... ... .... ... GUTTER C"'lACITY OF LOW CUR8 .... !OJ ... ... !OJ SOLUTION: .........
.... gII. FROM 0.6' ON THE ffiGIi"CUR8 PROJECT 􀁾...􀁾􀀠HORIZONALLY TO THE PIV'bT.J,.!.NE. FROM THE a: ::l .......\,I PIVOT LINE DRAW A STRAIGHT 12'NE.lO ... ....!i GUTTER SLOPE; 1.0"
......... ......... 􀁾􀀠>READ Q:0.16 c,I••• FOR HIGH CUR8lo-U .;: FROM 0.6'ON THE LOW CUR8 􀁐􀁒􀁏􀁾􀁅􀁃􀁔􀀠... .........."""" .;: HORIZON ALLY TO THE PIVOT L!!,-'_ FROM-THE \,I --'PIVOT
LINE DRAW A STRAIGR'r'L1NE TO 􀁇􀁾􀀱􀁊􀀮􀀡􀁬􀀱􀁌􀀠􀁓􀁌􀁏􀁾􀀧􀀻􀀢1.0" . __......-I'EAD Q: 11.0 c.I.•• fOR LOW CURB ...-Note: Does not include additional capacity for area 1 inch above
top of curb. ...... z ......_---•-3 '" 10.0 11.0 '.0 7.0 6.0 5.0 ".0 S.O 2.0 1.0 0.9 0.' 0.7 0.6 0.5 0.4 MIN. CAPACITY OF PARABOLIC GUTTERS (26'& 36' STREET WIDTHS) FIGURE 3 
--STREET WIDTH 40' 44' 0.0, HO.2 . ,HO.4 '" HO.6 '."" HO.8􀀺􀁾􀀠H1.0 MAX" -!-lO.:I' I--f-lO•4• 9.0' I-LO•2'-􀁾􀀸􀀺􀁦􀀠Hl--HO.2' HO.4' HQ.6· HO.8ALa· MAX._ 50 40 EXAMPLE:30 KNOWN: z '"
:10:; COLLECTOR STREET. !PAVEMENT WIDTH, 40' !...0-............................... _ > " z GUTTER SLOPE, 2.0'1; ...o ...ii: v-...._ GUTTER DIFFERENCE: 0.0' coUJ -_.....8 co II) FIND:_......
o f:i GUTTER C'XPACITY OF HIGH CUIIB 􀁾􀀠4 5 ... GUTTER CAPACITY OF LOW CURl!... 􀁾􀀠!-. --3 1􀁾􀀠SOLUTION:--................... 􀁾 -.....-------------tt..-------'-FROM 0.'" ON THE HIGH
CURB PROJECT z􀀺􀁉􀁾􀀠􀁾􀀠HORlZONALLY TO THE PIVOT LINE. FROM THE ... B PIVOT LINE DRAW A STRAIGHT LII'IE TO ... I :!: GUTTER SLOPE: :1.0'1; 0... I/) 0.8 ,.. READ Q: 2.56 c.,,,, FOR
HIGH CURB ::::;1􀁾􀀠FRO/llO.o'ON THE LOW CURB PROoiECT 0.4-j 􀁾􀀠HORlZONALLY TO THE PIVOT LII'IE. FROM THE O.3j V PIVOT LII'IE DRAW A STRAIGHT LII'IE TO GUTI'ER SI..()ft£, 2.0'1; 0.2
. READ Q: 9.41 ".I... FOR LOW CURB -\ Note: Does not include additional 0.1 --.I capacity for area 1 inch above top of 􀁣􀁵􀁲􀁢􀁾􀀠CAPACITY OF PARABOLIC GUTTERS (40'& 44' STREET WIDTHS)
.'; :.:':.:' ::. 􀀺􀀺􀀺􀁾..􀁾􀀢􀀧􀀠.... FIGURE 4 10.0 9.0 8.0 7.0 6.0 S.O 4.0 3.0 2.0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 MIN. l)IFl'l:lIJ;NCt 
10'j' 20' ALLEY 'I 16'ALLEY /' 6' ,. 6' "\ 􀀮􀀧􀀢􀀬􀁾􀀬􀀠􀁾􀀶􀁾._." 12' LLEY 10'ALLEYI' 1M' 'I' 12.5' " 6' .. " ,-' . 􀁾􀀬􀀧􀀠" . 2S'ALLEY I" W .• 􀀶􀁾􀁾􀀧􀀠"\ 􀁾􀀠􀀭􀁾􀀠20'ALLEY CAPACITY
OF ALLEY SECTIONS n:0.0175 FIGURE 5 12.5 f U,s' "\ 25'ALLEY Q Z o U '" '" 0: ...... ... .... .. .... !: IQ ::J U 15 aJ t:! 0: <:x: 􀀭􀀭􀀭􀀭􀀭􀁾􀀠•C1• NOTE: EXAMPLE KNOWN: ALLEY WIDTH:
12' ALLEY DEPRESSION: 6" GUTTER SLOPE: 􀀴􀀮􀀰􀁾􀀠FIND: GUTTER FLOW (Ql SOLUTION: CONNECT THE 12' ALLEY SECTION WITH SLOPE: 􀀴􀀮􀀰􀁾􀀠READ Q: 20.5 c.I••. 1000 900 800 700 600 500 400
300 200 20.0 10.0100 90 9.0 I-8.080 .... 7.070 ...... 6.060 <> 5.050 <>-4,040 0: 30 􀁾􀀭􀀭􀀭􀀭􀀭􀁾􀀠3.0 20 15 2,0 UI.. 0... 10 '" 1.0 0.99 0.88 0.77 6 0.6 5 0.5 0.4 MIN.4 THE CAPACITIES
08TAINED FROM THIS NOMOGRAPH ARE BASED ON A STRAIGHT HORIZONAL ALIGNMENT. CURVED ALIGNMENTS MAY RESULT IN REDUCED CAPACITY, 70 
FIGURE 6 􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀁾􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭, , AVAIt. I I I ' INLET DESCRIPTION " INLET " WHERE USED ,DESIGN
, I SIZES , ,CURVES , ,_ 1 __________________􀁾􀀬' _____I , I , " , I 8' , , Figures , , 􀁾􀀠" Residential Street, Collector, 1 , , 10' , , 7 I ,-􀁾:::;;:1--, ,Street -Types 1 C2UA and
C2UB;, , STANDARD CURB OPENING I 12' , , Through I , , , Alley " I INLET ON GRADE ,14', I 11 I , '___I " , , , rcn II s' , " " . . I Residential Street, Collector I I ,--1::;::""':"
:::;;:1-I ,10' , ,Figure 'I STANDARD CURB OPENING I, I Street -Types C2UA and C2UB; I I 12 t I , 12 I I INLET AT LOW POINT' I Alley " 1 '14' , " I I 1 I' I I I I I 'I _ }02_ _ II 8'
1 I Figures , 􀁾􀁾􀀠􀁾􀀠_ I collector Street, Type C4U I , 􀁉􀁟􀁾􀀠:-<1_' 10' 1 , 7 , 1 RECESSED CURB OPENING I I Major Streets -Types M4U, ;,;40, , ! I I 12' I I Through I I INLET ON
GRADE 1 I M6D, Principal Streets (P6D) I I I I 14' I 1 11 I I 1 I 1___1 I I I I' 8 􀀬􀁉􀁾􀀠11 ' I I' 􀁾􀁟􀁟􀁟􀀠I Collector Street, Type C4U I I I__ 􀁾􀀠:::>;:1_ I 10' I I Figure 1 I
RECESSED CURB OPENING I I Major Streets -Types M4U, M4D, I I I I 12' I 1 12 I I INLET AT LOW POINT I , M6D, Principal Streets (P6D) I I 1 I 14' , I I I 1 1 I 1 : : 71 
PIGURE 6, continued 1 1 I AVAIL. 1 DESIGN 1 INLET DESCRIPTION INLET WHERE USED 1 CURVES SIZES 1 _1________________________ __ 1 1 1 Combination Inlets to be Used I Figures 1 ,-----,
I 1:-k?lii!iiJ ::::;:1-: 8' Where Space Behind Curb : 13 I COMBINATION INLIT I Prohibits Other Inlet TypesI Through 1 1 1I -ON CRAOE 1 1 15 1 _I 1___ I 1 1 1 1 Combination Inlets to be Used 1 !---L.--::::: -:-==;J-I 1Figure 1 . COMBINATION INLfT 1 8' Where Space Behind Curb 1 1 1 I 16 I
AT LOW POINT I prohibits Other Inlet Types 1 i I 1____ 1 1 I I I 2 GRATE Grate Inlets to be Used Where I Figures I I 1 1 􀁾􀀠1 3 GRATE Space Restrictions Prohibit 1 17 1 eRATf INLETS
1 1 I 1 4 GRATE Other Inlet Types or At I Through 1 I I , I 5 GRATE Locations with No Curb. I 20 1_-_______ 1____1 I I I 1 I I 1 I Figure I 1 I I I 1 21 1 1 1 I I I I 72 
HECESbED AND STANDARD CURB OPENING INLET FiGURE 7CAPACITY CURVES 40 30 20 15 10 9 • 6 S 4 3 2 III I nv' " n, .0175 t ISTREET CROWN T YPEIWIDTH ;:: 􀁾􀀠26' F'F •• PARASOLIC l"v : . t..-:
􀁾r;...c;... L-o-v k:: V00 􀁾􀀠􀁾􀀠􀁾􀀠􀁾􀀠􀁾􀀠􀁾􀀠be 'l //"V V ""/1/1/V "!/V V I , lim 1 2 3 4 5 6 7 • 9 10 15 20 2S 30 QUANTITY OF FLOW IN C.F's. DECISION: 1. USE 10' INLET NO FLOW
REMAINS IN GUTTER 2. USE ,'INLET INTERCEPT ONLY PART OF FLOW USE S' INLET ENTER GRAPH AT LI: " INTERSECT SLOPE: 1.0 " READ Q: 4.6 c.l.... REMAINING GOTTER FLOW, 5.2 c.I ........ 6 c.f.•.
'.6 c.I.•. 7 II '} 10 15 20 2S 30 SO 40 30 20 I 5 10 '} 8 7 6 5 4 .J 2 •.1' ON EXAMPLE GRADE KNOWN: PAVEMENT WIDTH: 26' GUTTER SLOPE: 2.0" •• PARABOLIC CROWN GUTTER fLOW: 5.2 c.I .•.
FIND: LENGTH OF INLET REQUIRED SOLUTION, ENTER GRAPH AT 5,2 d .•. INTERSECT SLOPE: 2.0" READ L 1: ••7' 2 3 5 6• 
RECESSED AND STANDARD CURB OPENING INLET FIGURE 8CAPACITY CURVES EXAMPLE KNOWN: PAVEMENT WIDTH: 36' GUTTER SLOPE: 3.0lll 6' PARABOLIC CROWN GUTTER FLOW: 5.2 <.I ••• FIND: LENGTH OF INLET
REQUIRED SOLUTION: ENTER GRAPH AT 5.1 c.I .•• INTERSECT SLOPE: 3.0lll READ LI :&.8' I 2 ON GRADE II 6 DECISION: I. USE 10'INLET NO FLOW REMAINS IN GUTTER 2. USE 8' INLET INTERCEPT ONLY
PART OF FLOW USE 8' INLET ENTER GRAPH AT LI:8' INTERSECT SLOPE: 3.0 III READ Q: 4.6 c.I... REMAINING GUTTER FLOW, 5.2 ".1.•. • '.6",.1 ••. :0.6 oj. 7 8 9 10 15 20 25 30 -= -= Ff:: I􀁾􀀠t::
1 ROil STREET WIDTIi ALL 3'· F·F 􀁾􀀠" n: .0175 CROWN TYPE 1/2 Inch CROS loot S SLOPE " A:A "" V " L6-/....:; ,/' /l/;"-V 􀁾i/􀁾􀀬􀀮􀀮􀀠1I ;;:i' 2 3 5 6 7 8 9 10 OlTANTrT"<-()F FI ()W
IN ('I'"" 4o 30 􀁾􀀠:Io ,/' ,/' ,/' /1 5 /.V;' ..r V 10 9 8 7 6 5 4 3 2 IS 20 25 30 III.. :-'" !5 ;. III .. .... z 0 l: ;. III Z III .... .... 50 40 30 20 IS 10 9 a Ii 5 4 2 
1 50 4 30 20 1 5 . ...5 4 3 2 RECESSED AND STANDARD CURB OPENING INLET CAPACITY CURVES FIGURE 9 ON EXAMPLE GRADE KNOWN: DECISION, PAVEMENT WIDTH: 28' GUTTER SLOPE: 3.0" PAVEMENT CROSS
SLOPE: 1/4"/1' GUTTER FLOW: 4.8 c.I... FIND: LENGTH OF INLET REQUIRED SOLUTION: ENTER GRAPH AT 4.8 <.1... INTERSECT SLOPE: 3.0" READ L I : 9.5' 2 4 5 6 '􀀢􀀢􀀬􀀬􀁾􀁵􀀾􀀻􀁅􀁓􀁓􀀠.. n:
.0175 0,STREET'f-􀁾􀀠IWIDTH CROW ALL lIt 􀁾C ; , 􀁾􀀠􀁾􀀠􀁾􀀠N TYPE ROSS SLOPE '/'/'/12 yl/L7 12 r/IljV' Vy '.nov r.,.. r", r;, 􀁾􀀠􀁾􀁾􀀠F';/'I 􀁾􀀠I:'oC r.w !t# 􀁾􀀠17 1/V /V V I;
Ii I 1. USE 10' INLET NO FLOW REMAINS IN GUTTER 2. USE 8' INLET INTERCEPT ONLY PART OF FLOW USE S' INLET ENTER GRAPH AT LI: S' INTERSECT SLOPE: 3.0" READ Q: 3.9 cJ.a. REMAINING GUTTER
FLOW: 4.8 c.I•••-3.9 .0.1•••:0.9 c.L· 7 8 ') 10 15 20 25 30 50 40 30 20 15 10 9 8 7 6 5 3 2 2 3 4 5 6 7 8 9 10 15 25 30 OUANTITY OF FLOW IN c'F,S. I 
RECESSED AND STANDARD CURB OPENING INLET fIGUR!! 10CAPACITY CURVES ON EXAMPLE GRADE KNOWN: DECISION: PAVEMENT WIDTH: 40' 1. USE 10'INLET GUTTER SLOPE: 1.0" NO FLOW REMAINS IN GUTTER
'" PARABOLIC CROWN 2. USE S' INLET GUTTER FLOW: 6.5 c'/... INTERCEPT ONLY PART OF FLOW FIND: USE "INLET LENGTH OF INLET REQUIRED ENTI!R GRAPH AT LI : 8' SOLUTION: INTERSECT SLOPE: 1.0S
ENTER GRAPH AT 6.1 c."', READ Q: 5.0 c.J... INTERSECT SLOPE: 1.0 " RBMAJNIOIO GUTTER FLOW: '.5 oJ...• 5.0 d. :1.5, 1 READ LI: 10' 2 .I " II 6 1 , 9 10 15 ,20 2Ii 3o 2{ • ;:; 1 z .I "
5 6 1 8 9 10 15 20 2. 30 ron 'I tro.ITl"T'''\f ", ................... I"" ... ... SI50 I-􀀭􀀻􀀮􀁾􀀠""n. '-VElr ...0: .0115 _ I-STREET>-CROWN TYPEI-􀁗􀁬􀁬􀁊􀁾􀀡􀀡􀀠-3/8 -30 􀁾􀀠ALL Inch
CROSS SLOPE footE 40' F·F 6" PARABOLIe􀁾􀀠1:::1 44' F-F 0" PARABOLIC>--; 20 v ,'"[/v V15 V V !/VI/V-I.' i'/[,-I"'V:'" lu 17,: I 51 !'".? 9 , 8 1 6 􀁾􀀠6 5 􀁾􀀠5 " 4 "' r:2 􀁾􀀠3 2 2

RECESSED AND STANDARD CURB OPENING INLET FIGURE 11 CAPACITY CURVES ONEXAMPLE GRADE KNOWN, DECISION: PAVEMENT WIDTH: 12' 1. USE 14' INLET ALLEY SLOPE: 0.4" NO FLOW REMAINS IN GUTTER Z.
USE10'INLET QUANTITY Of fLOIII: IO.Se.!.•. INTERCEPT ONLY PART OF FLOW FIND: USE 10'INLET LENGTH Of INLET REQUIRED ENTER GRAPH AT L I : 10' SOLUTION: INTERSECT SLOPE: O.n;, ENTER GRAPH
AT IO.Sc.f... READ Q: 7.3c.l.a. INTERSECT SLOPE: O.CI REMAINING PLOWINAUEY: 10.lc.f...-7.3e.f...:3.2c.l. READ L I : U.O It. I :It 3 C 5 6 7 8 9 10 15 as 30 ," CO40 30 30 zo 20 I 5 15
10 10 , 9 • 8 7 6 6 ... 5 5 4 4 :3 2 1 z 3 4 5 6 1 8 9 10 15 25 •• Z .20 f-..". 􀁉􀀧􀀧􀀧􀀧􀁾􀀧􀀠,.. r n: .ell 75 b STREET CROWN T YPEi-WIDTH ;:= ALL ,. INYEIITED :.jqi 􀁾􀀠"f/--! '-'"
V 1/---17 V V V D [7v 􀁾􀀠V I:::: 􀁾􀀠􀁾l.-V r;. 􀁾􀀠V 14 􀁾􀀠II31-I;:::l= nnANT'TV OF F'f OW tN 􀀨􀀢􀀮􀁆􀀮􀁾􀀠
RECESSED AND STANDARD FIGURE 12CURB OPENING INLET CAPACITY CURVES AT LOW POINT EXAMPLE SOLUTION:KNOWN: QUANrry OF FLOW: 19.0 c.I.•. ENTER GRAPH AT 19 c.I.•. MAXIMUM DEPTH OF FLOW DESIRED
INTERSECT yo: 0.1' IN GUTTER AT LOW POINT (yo):O.S' READ LI : 9.0' FIND: USE to' INLET LENGTH OF INLET REQUIRED (LII 2 􀁾􀀠11/11/"" Z .. 11/!i 9 "" o :t 􀁾.., Z 􀁾􀀠11 1I .. 5 /I 7 8
9 10 25rTfTTTTlT ROUGHNESS COEFFICIENT N:.0175 -, STREET 0 WIDTH CROWN TYPE ALL 􀁓􀁔􀁒􀁾􀁉􀁇􀁈􀁔􀀠AND PARABOLIC J 15 ;: 10 8 7 6 5 1/Ij I I I , 􀁉􀀼􀁾􀀠1/V I I II II II j V 1/V 15 20
30 40 50 ,0 I II I II I II J 1 7 /I I /il I':'1 er 􀁾􀁾􀀠70 8 20 15 10 9 8 7 6 5 4.. 2 5 /I 7 8 9 10 15 20 30 40 50 60 70 80 QUANTITY 􀁏􀁆􀀬􀁾􀁌􀁏􀀢􀀬􀀠.N C.F.S. 
TWO GRATE COMBINATION INLET FIGURE 13CAPACITY CURVES ON GRADE EXAMPLE KNOWN, SOLUTION: ENTER GRAPH AT 9.0 c.I.•. QUANITY OF FLOW, 9 c.I.L INTERSECT SLOPE: 3.0 II GUTTER SLOPE: 3.011
READ PERCENT Of fLOW INTERCEPTED: 61" fiND, 61" Of 9.0 c.I••• : 5.5 c.I••• AS CAPACITY OF TWO GRATE CAPACITY OF TWO GRATE COMBINATION INLET COMBINATION INLET REMAINING GUTTER FLOW: 9.0
d ••. -5.2 e.I.•• , 3.8 c.I.•. II III II 􀁾􀀠􀁾􀀬􀀮"I 􀁾􀀠I--"􀁾􀀠􀁾􀀠, V 􀁾V'4􀁾􀁾􀀠'1>'V 􀁾􀁾􀀼􀀢􀀠V 􀁾􀀠􀁲􀁾􀀠/,-􀁾􀀠􀁾􀀠....... 1--' ..........􀁾􀀠'c to I--'I-" ( 􀁾􀁾􀀠:..--1-'
􀁾􀀠'!Io1-'1--' I-' I--' 1--'1--' 1-'1-' 􀁾Ii-, I-' I-'I--' ., I--' I--' ~ 1-'''I'" ,""K "r-I-' I)"....:.......:,....-1-') .... :..--􀁾􀀠'l"'iUV :........... Kf/"" .... \ "" V .....
'" I--' ... f-V "" .... I--' I--' V V "" '"""r--i-' " V t5V j./􀁾􀀠V • 􀁾􀀠􀀮􀁾􀀠r\ 􀁾􀁾􀀠I-' 􀁾􀁊􀀮􀀭􀀧􀀠506o4 5 6 7 a 91r 15 20 30 401 2 QUANTITY OF FLOW IN C.F.S. 
THREE GRATE COMBINATION INLET FIGURE 14CAPACITY CURVES ON GRADE EXAMPLE KNOWN: SOLUTION, QUANTITY Of fLOW, 15 ••1••• ENTER GRAPH AT U c.I.•. GUTTER SLOPE: 1.0 " INTIlRSECT SLOPE, 1.0
• FIND: READ PERCENT Of FLOW CAPACITY Of THREE GRATE INLET INTERCEPTED: 61.• 61. OF 15 10.1...: '.S c.I••• AS CAPACITY OF THREE GRATE INLET REMAINING GUTTER FLOW, 15 c.I•••-9.S c.I•••
: 5.7 c.I••• . 􀁾􀀠;;. ,..... V if. 􀁲􀁾􀀮􀀠􀁾O!, Pk .... 1..... '-' .... .... i-' .... 􀁾􀁾􀀠􀁾􀀠􀁾􀀠􀁩􀀢􀀢􀀱􀀭􀀭􀀢􀀧􀁾􀀠>, f.., "" "",....i--....... >"" ,.... ........",.. .... V ><
... ".,. ,.... ""> ............ ".,. i-'" .... ...,'􀁾t"" ".,. t> (:: ,.... .... ..... bLe""i--I--»I<j...", p c;. .....>< :\,0"", ..... 􀀦􀁾.,.,.. V>.: ", 􀁾􀀬􀀠􀀧􀁾􀀠>-V .,.,.. 􀁾􀀠'/0
...... .,.,.. ", 􀁾􀁾I-􀁉􀀩􀁾􀁾􀀺1--....... '" 􀁾􀀮􀀢􀀠􀁾􀁏􀀠.......... 􀁾......i-' .-> ......... ,.... ... ,;;.1< ....... i-' "" .... 4 5 6 7 8 9 10 20 30 40 50 60 QUANTITY OP FLOW
IN C.P.S. 80 1 2 3 
FOUR GRATE COMBINATION INLET FIGURE 15 CAPACITY CURVES ON GRADE EXAMPLE KNOWN' QUANTITY OF FLOW: 11 ...f ••• GUTTER SLOPE: 1.0 " FIND: CAPACITY OF FOUR GRATE COMBINATION INLET SOLUTION:
ENTER GRAPH AT 11 ...1••• INTERSECT SLOPE: ••0 !II READ PERCENT OF FLOW INTERCEPTED: 61 II 61 IIOF 11 ".1•••: I .• c.I••• AS CAPACITY OF • GRATE COMBINATION INLET REMAINING GUTTER FLOW:
11 ...f••••......1••• : S.' c.I••. 􀁾􀀠􀁾􀁾􀀠􀁾"". 􀁾􀁾􀁾􀁰􀀬􀀠􀁾􀀠􀁾􀀧􀁩􀀧􀀭􀀮􀁃􀁩􀀭􀀧􀀠...􀁾􀀠􀁾􀁐􀀢􀀾􀀠',<...... ..... .....1--... >::::.............. 􀁾,.-.....K ...... .........
􀁾􀀠........ ..... Ifl.I. .....>< 􀁾I.-' 1,..01,..0,.V ..... ...1-' 1--1,..0>< -"" I • '> ..... ..... -/􀁾􀀠....../C;; ...1-..... ...1-..... .t...􀁾􀀠k 􀁾􀀠􀁾􀀠V V 1'-' flo i.--' V V
􀁾􀁾􀀠􀁪􀁴􀁾􀀠V V V V 􀁾􀀠... 􀁾􀁾􀀠-"" 􀁾.. 􀁾􀀠1--..... V 􀁾..... '" 􀁾􀁾􀁴􀀠£-,,:r'" ..... ...r" I 2 3 4 5 6 7 8 9 10 IS. 20 30 40 50 60 QUANTITY OF FLOW IN C.F.S. 
COMBINATION INLET CAPACITY CURVES AT LOW POINT fiGURE 16 EXAMPLE SOLUTION,KNOWN: ENTER GRAPH AT 20.0 c.!••.QUANTITY OF FLOW, 20.0 c.!.•. MAXIMUM DEPTH OF PLOW DESIRED INTERSECT yo :
0.5' AT. LOW POINT (yo) : 0.5' READ LI : 8." FIND, USE I O'INLET LENGTH OF INLET REQUIRED (UI o 40 !O10 20 l.... W... :5 t... 􀁾􀀠􀁾􀀠: 􀁾􀀠Z 􀁾􀀠􀁾􀀠4 40 50 60 70 807 8 9 10 15 20 30
Q-QIJANTITY OF FLOW IN C.F.S... 2 3 4 5 6 15 .. 5 6 7 • 9 10 HI T IIi I .1... 1 I I I IJ. I I 􀁉􀁾I tH++-H1f++fHII-H+-lY'-'I'--t-rf+++I ROUGHNESS COEFFICIENT II! .0171 STREET WIDTH CROWN
TYPE I I If ALL STRAIGHT AND PARABOLIC 􀁬􀀫􀀭􀀡􀀫􀁦􀀫􀁬􀁍􀀫􀁈􀁾􀀫􀁉􀀭􀀭􀀱􀀢􀁾􀁉􀀭􀁁􀀬􀀭􀀭􀀧􀁦􀀱'4--HH-+i -......,.. ""'I'"'T"'-" I"" ............... ... /1/1 ./J II 􀁾􀀠􀀱􀀰􀁈􀀫􀁽􀁈􀁈􀀫􀁾􀁾􀁾􀁾􀀴􀀭􀁾
􀀴􀀭􀁾􀁾􀁈􀀴􀀭􀁖􀁉􀀯􀁾􀀴􀀴􀁾􀁈􀁈􀁾􀀠ICUI I 􀀹􀁈􀀴􀀫􀁈􀀫􀁈􀁾􀀭􀀫􀀭􀀫􀀭􀁦􀀭􀀫􀁾􀁾􀁾􀀫􀀫􀀫􀀫􀁾􀁾􀁾􀁾􀀬􀀬􀁾􀀫􀁊􀁾􀂥􀁈􀁦􀁬􀀫􀀭􀀭􀁾􀁴􀀭􀁴􀀭􀁲􀁩􀀭􀁴􀁾􀀭􀁈􀀹􀀠􀀸􀁈􀁈􀀴􀀫􀁾􀁾􀀭􀀫􀀭􀁦􀀭􀀴􀀭􀁦􀁾􀁾􀁾􀀫􀀫􀀫􀁦􀀫􀀫
􀁾􀁾􀁉􀀯􀁴􀀴􀁾􀁈􀁈􀁾􀀫􀂥􀁈􀀫􀁈􀀫􀁈􀀭􀀭􀁴􀀭􀀫􀀭􀀫􀀭􀁴􀁾􀁴􀀻􀁾􀁴􀁩􀀸􀀠􀀶􀁈􀁈􀁦􀁾􀁾􀁾􀀫􀀭􀀫􀀭􀀫􀀭􀁾􀁾􀁾􀀫􀀫􀁾􀁾􀁖􀁾􀁾􀀴􀀴􀁾􀁈􀁋􀀫􀁈􀁾􀁾􀀭􀀱􀀭􀀱􀀭􀀫􀀭􀁴􀀫􀀴􀀭􀁴􀁴􀀻􀁈􀀶􀀠I I I 1/
TWO GRATE INLET CAPACITY FIGURE 17CURVES ON GRADE EXAMPLE KNOWN: QUANTITY OF FLOW: t.O c.I••• GUTTER SLOPE: 0.6 II FIND: CAPACITY OF TWO GRATE INLET SOLUTION: ENTER GRAPH AT c.l•••I.'
INTERSECT SLOPE: 0.6 • READ PERCENT OF PLOW INTERCEPTED: 61' 61 II OF 1.0 c.I••• : I.J c.I•••. AS CAPACITY OF TWO GII.ATE INLET . RENAINING GUTTER FLOW: 5.0 •.1... ".J c.I••• : 1.1 c.I•••
􀁾􀀠'%. 􀀨􀁜􀁾􀀠􀁾􀀺􀁾􀀠'fie: -.; ".,. /V .../􀁾􀀠.../􀁾􀀠l,..V t...V 􀁾VV 􀁉􀁊􀁾􀀠I.... '" .. I--' '\ I "C 􀁾􀁾􀀱􀁆􀀧􀀠􀁾􀁉􀀭􀀭.. \ ... ....􀁾􀁲􀀭....K ..􀁾􀁲􀀭... 1( ..1,.-'"... .....,...
....k ... ... I,..; I,.V 􀁩􀀬􀀮􀀮􀁯􀁯􀁾􀁬􀀬􀀮􀀭􀁪􀀮􀀮􀀮􀀠i--' 􀁾􀀠􀁾􀀠􀁾􀁉􀁉􀁾􀁾􀀠) ".,. /'" ".,. 06' • Y ) 􀀬􀁾􀁾􀀠􀁾t:::r::; [\ 􀀬􀀬􀁾􀀠􀁾􀀺VI--'.. 􀁾􀀠􀁾􀀠1--'1--' ..... I'>..1\ ....I-􀁾􀁉􀁜....I-
􀀬􀀮􀀮􀀮􀀮􀀮􀀮􀀮􀀮􀀬􀁾􀀠,..... .. -5 6 1 8 9 10 15 20 30 40 50 60 QUANTITY (''' FLOW IN C.F.S. 3 41 2 
------------FOUR GRATE INLET CAPACITY CURVES ON GRADE FIGURE 18 EXAMPLE KNOWN' QUANTITY OF FLOW, 20 c.f••• GUTTER SLOPE: 1.0 " FIND: CAPACITY OF FOUR GRATE INLET SOLUTION, ENTER GRAPH
AT 20 c.f .•. INTERSECT SLOPE: 1.0 " READ PERCENT OF FLOW INTERCEPTED; 63 " 63 "OF 20 c.f••• : 12.6 c.f••• AS CAPACITY OF FOUR GRATE INLET REMAINING GUTTER FLOW: 20.0 c.f ••. -12.6 c.f.....
7.4 c.f." II .. :;,..􀀮􀁾􀀠􀁾􀀠10 􀁾...'" ,.-....􀁾􀀠.. 6"'III J,,U ,.-'"2; '"' -V 􀀳􀁾... . /.U 􀁾􀁾􀀠,.Ill! V 2'􀁾􀀧􀀢􀀠,.􀁾􀀠./'"..--t-1" .... ,....-1..: ...."' __ I-" , G..T 􀁅􀁾.....
t-------", 5 LO E, , ......􀀭􀀭􀀢􀀧􀁾..􀁾􀀠,...,-:,....----..... i ; ....-....V ' ",.,...--1 -----1--'",.t..----/:":::: ", --r,.. ......,.,.... "-1....,./: ......,.-'1./'" J..I'T ..-􀀭􀀭􀁾􀀠􀁾􀀠1
2 3 4 5 6 7 8 9 10 15 20 30 40 50 60 QUANTITY OF FlOW IN C.F.S. 84 
SIX GRATE INLET CAPACITY FIGURE 19CURVES ON GRADE EXAMPLE KNOWN' QUANTrfY OF FLOW, 4.0 c.f••• GUTTER SLOPE: S.O S FIND: CAPACITY OF SIX GRATE INLET 1 '\ 􀁾􀀠􀁾􀀠􀁾􀀠􀁾􀁾􀁾􀁾􀀠􀁾􀁊􀀺r,􀁾􀀮􀁾􀀠􀁾􀀠....
.......K l--􀁾........... I.I.... 􀁾􀀠.... i--i-.....or"'f. 􀁾........i--i-..... 􀁾........ v K:v ..... ..... .... ......1All 􀁾􀀠..................... ....... ............. .....r:::
)..... 1).;1-l--'l-l--'es 􀁾􀀠V 􀁉􀁾􀀠i,.-V ......... ""1.-1..... SOLUTION: ENTER GRAPH AT 4.0 c.f... INTERSECT &LOPE. 3.0" READ PERCENT OF FLOW INTERCEPTED. liS U"OF 4.0 c.I...: S.4
••1 ••• AS CAPACrfY OF SIX GRATE INLET REMAINING GUTTER FLOW: 4.0 c.I...• 1.4 c.I••• : 0.6c.f••• '" " 􀁾􀀨􀀠" V V i-' ft.1 v-i-' y 􀁾􀀬􀀠:,/ij,')' ... 1.V y "" 􀁾􀁉􀀭􀀧􀀠I.􀀬􀀬􀁾􀀱􀁉􀁲􀀻􀀻􀁾􀁾"I.􀁾􀀮
"",i-",l.􀁾􀁾􀀠1--.... I--􀁾􀀠"" 􀁾􀁩􀀭,.... 40 50 601 2 s 4 5 6 1 8 9 10 15 20 30 QUANTrfY OF FLOW IN C.F.S. 
GRATE INLET CAPACITY CURVES AT LOW POINT EXAMPLE KNOWN: SOLUTION: QUANTITY OF FLOW: 4.8 ••1.•• ENTER GRAPH AT 4.8 MAXIMUM DEPTH OF FLOW DESIRED INTERSECT 3 • GRATE AT AT LOW POINT: 0.4'
INTERSECT 2 • GRATE AT FIND: USE 3 • GRATE INLET REQUIRED 2 3 4 5 8 9 10 FIGURE 20 ••1••• 0..28' 0.63' 150.7 v *1/W , , , --..-I--1--7 7 II II fI II 3 4 5 7 II II 6 7 I ----7 II /III
I /. 7 ,] .'l . FI I J II I 7 7 , ..J , , , i 0.7 0.6 0.6 0.50.5 0.4 0 ..4 '" .. " ... :II: 0..10.3-3 0 ,.j... ... 0 :: l-I>. OJ Q 0.2 0.2 6 7 8 9 10 QUANTITY OF FLOW IN C.F .S. RI}

DROP INLET CAPACITY CURVES AT LOW POINT EXAMPLE KNOWN: SOLUTION: QUANTITY OF FLOW: 12 c.L•• ENTER GRAPH AT 12 MAXIMUM DEPTH OF FLOW INTERSECT yo: 0.5' DESIRED (yo): 0.5' READ L I , 12.3
FIND: USE 12.1 Of INLET 4x4 LENGTH OF INLET OPENING REQUIRED (L I) 1 .. 5 6 1 8 10 15 20 302 25 T I 20 Im tmt I :v '. . /f-J '. IJ4WI 11/1511/II V' ·V 1/... I ,VZ /I /-j,-i-. .1-'.-f-Z.
'" -Z I 􀁾􀁉􀀠􀁾1/11/I\, I; 􀁾0 '/II f-lO 11/...l IZ 9 JI-... I/0 8 V:I: I f,1/if'" 1z 11//I/J II...l I /I 6 II II II I I II IIJ II5 4 1 2 3 .. 5 6 1 8 910 IS 20 30 QUANTITY OF fLOW
IN C.f.S. STANDARD DROP INLET SIZES: 2'x 2', LI:S' 3'" 3', LI:12' 4'" 4', LI:16' 87 FIGURE 21 c.I.•. I I /4 20 4x4 15 I ,L 10 9 8 2x2 7 6 5 4 40 
'r. 1:'> _ , 'I •,j 'j 􀁾􀀠􀁾􀀠., 􀁦􀁾􀀠'r 􀁾􀀬􀀠+, 􀁾􀀲Ii. i 􀁾􀀠; i. r , , --, 􀁾􀀠\ ----· --· · -, I · >;; lX ./􀁾􀀠" >c \ 􀁾􀀠\, \. \ '\ V 1\ \. "\ ..... I, \. I\' \. 􀁾􀀠1 ::. '-'(
J' .... 1),-􀁾􀀠J' 􀁾􀀠6 ;"( x \. I\. -'" t"" '\ \ 1\ '\ \, " \. I'ff 􀁾􀀠, 1\ i .,.".. 1000 900 CAPACITY OF CIR4 800 700 PIPES FLOWING F FIGURE 22 600 500 400 300A GRAPHICAL SOLUTI
Of MANNING'S EQUATIO 200 V,, 1.486 Ri 51 n I! n:O,O)3 .J .J ;;J100 90 '" SO z '" 70 3 0...60 .... Q : C.I.A. (C.f.5.) 50 Q ZC : COEffiCIENT C40 uI : INTENSITY ;.;..: <J; A : AREA 30
'" Q. '" I:;.: "" 20 V ;;J '" v Z iii:10 09 ... 8 '" 7 6 S 4 32 .. .., 1 88 
OUTFALL OF A STORM SEWER INTO A CHANNEL fiGURE 23 DESIGN TAILWATER NORMAL TAILWATER (NOT ALLOWED) DESIGN TAILWATER 20' OR GREATER FOR 90· INTERSECTION ANGLE NORMAL TAILWATER ... MIN.:I0·x
DIA. (ALLOWED) , OUTfALL SLOPE SUCH THAT NON EROSIVE EXIT VELOCITIES WILL OCCUR. 89 
FIGURE 24 Approximate Routing Method for Watersheds < 160 Acres STORAGE VOLUME tv) 􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀀭􀀭􀀭􀀭􀁑􀁄􀀧􀁑􀁅􀀠"""" """" """L-__+-______-+____􀁾􀀭􀀭􀀭􀀭􀀭􀀭􀁾􀀠I I TD TD+TCp
TIME (MINUTES) -TCp) + (Tn + Tcp)J/2 ) -(QE [TCp + Tnl/2) J in acre-feet. Where: Peak discharge in cfs for developed watershed using 􀁳􀁾􀁣􀁲􀁑􀀠duration equal to TCp. Peak discharge
in cfs for existing watershed, assuming full residential development and corresponding TC' Peak discharge in cfs for developed watershed based on a storm duration that yields the existing
discharge for Cp and A: TCp -Time of concentration in minutes for proposed development. Storm duration in minutes corresponding to In. -Rainfall intensity (inches/hour) for a storm duration
that produces Qand is calculated using the following formula:n Where: Cp Rational "C· for developed condition. A nrainage area in acres. 90 
"i FIGURE 24, continued Detention Basin Example: Development Data: Drainage Area -160 acres Residential C -0.55 Residential TCR -15 minutes Developed Cp -0.70! Developed Tep -10 minutes
For the lOa-year storm: , I IRES -7,52 in/hour (from Figure 1) Ip -8,82 in/hour, QE -Q0.55 (7.52) (160) -662 cfsn -Qp -0.70 (8.82) (160) -988 cfs 662 10 -􀁾􀀻􀀻􀀭􀀭􀀻􀀭􀀺􀀭􀀻􀁾􀀠-5.91
1n/hour(Cp A) (.7) (160) From Figure 1, for In -5.91 in/hour, Tn -28 minutes 60 v -(43 560) [ ( 662 [ (28 -10) + (28 + 10) ] 12 )• v -􀀨􀀴􀀳􀁾􀁾􀀶􀀰􀀩􀀠[ ( 662 [56] 12) -662 [38J 12)
J v -8.21 acre· feet . , I • (662 [28 + 10] 12 ) ] . I 91