:) ~ ~ ~ ~ ~ '" ) -J n v .L ;s It') a :t ", ~ ::t:: , ; !~ ,lC: '< ,"I ~~ " ,,. ~ -1 '"':l"J:) "~ ~ :t, I • Formerly Comprehensive Drainage Cri.~eria and'Design (CDCD) , -,,~. ..,~ North Central Texas Council of Governments {NCTCOG)needs your Input In developing regional drainage criteria and design guidance. To address the storm water issues facing the region and in response to certain state and federal regulations. NCTCOG and more than 55 local governments are taking a proactive role in the development of a comprehensive drainage criteria and design manual for North Central Texas. This integrated storm water management (iSWM) manual will be the first of its kind in the region to combine comprehensive storm water management practices for both quantity and quality storm water issues. It will be flexible. yet uniform and will provide guidance applicable to projects of all sizes and locations within the region. --'7 The iSWM manual will outline the most current and applicable storm water management techniques. and provide criteria and rationales for the selection of structural and nonstructural water quality and quantity best management practices. The manual will also include detailed design specifications for these controls. and techniques for integrating storm water quality and quantity considerations. Additionally. an updated NCTCOG manual for BMPs during construction will be coordinated with this manual. To make this project successful. NCTCOG needs your input regarding what your local government is currently doing and what key issues need to be addressed. Please plan on attending one of the meetings, and bring your existing drainage manuals, ordinances, and criteria to assist with the development of the regional manual criteria. With the region's combined efforts. the iSWM manual will provide the most up-to-date criteria and options unique to the storm water issues facing the North Central Texas Region. For more information. contact Kenneth Calhoun. 817/695-9224. email kcalhoun@dfwinfo.com or log on to iSWM.dfwinfo.com. NATURALLyl DEVELOP NATURALLyl What is Land Development? According to Webster's Dictionary, it is to make the land (the surface of the earth and all its natural resources) suitable for residential or commercial purposes. North Central Texas has been blessed with an abundance of land to develop and a current economy that is second to none. Development is necessar.,y. for the economic viability of this region but, as we are learning, how this "development" occurs has a profound impact on the natural environment. We are seeing the consequences of our thriving economy and our development practices on the environment we live in. Some of our most precious natural resources -including the Trinity River, our area lakes, and the Ancient Cross Timbers Forest -are being degraded, resulting in impaired water quality and loss of habitat. North Central Texas has a great natural heritage that can be preserved by the use of environmentally sensitive development practices. Many of the practices for minimizing the impact of development can have benefits for the developer in terms of reduced cost and in attracting potential buyers by incorporating features that buyers reportedly consider important when shopping for a home. These practices benefit the eventual residents of the development and the larger community as well. A natural buffer of trees and vegetation along streams filters storm water before it reaches the waterway and also provides excellent habitat for birds and wildlife. Stream buffers provide natural open space and areas for locating walking/biking paths, both of which are rated as "extremely important" by approximately 75')'0 of recent homebuyers in a national survey. Gardens with native plants, clustered retail stores, wilderness areas, and "interesting little parks" were rated as extremely important by 50% or more of recent homebuyers in the same survey. Take a look, do some more research, and See how the Ten Keys to Developing Naturally can help you meet your objectives and improve our environment. Naturally North Central Texas is going to develop --so let's do it naturally.. Ten Keys to Developing Noturo.lly 1. Maintain existinq terrain Incorporating the development into the existing terrain rather than regrading the site helps preserve tree canopy and other vegetative cover. Maintaining the terrain and natural drainageways helps to reduce pollution and storm flows from developments and provides protection for environmentally sensitive features on the site. 2. Minimize impervious surfaces Impervious surfaces include roads, parking lots, driveways, and rooftops, that don't allow infiltration of storm water into the ground. The increase in storm water runoff, along with the pollutants the runoff picks up from impervious surfaces, cause major problems for our waterways. Narrower streets and smaller parking lots benefit the environment and can make a development more attractive as well. 3. Build in the least sensitive areas By building in the least sensitive areas, negative impacts on ecologically valuable features are avoided. Areas that should be preserved include wetlands, floodplains, buffer areas adjacent to streams and lakes, prairies. and stands of mature trees. By increaSing the density on the remaining portion of the property, approximately the same or can created compared to "conventional" designs. 4. Provide open space/parks Natural open space is extremely valuable as wildlife habitat, storm water infiltration areas, and as protective buffers for ecologically sensitive areas. Just as important, open space serves as an extension of the individual residential lot. Quality open space that provides opportunities for walking, biking, bird watching, and play is extremely popular with homebuyers. 5. Preserve streams and floodplains Natural streams, floodplains, and riparian buffers are vital to the success of natural systems. Buffered with trees and vegetation, natural streams also provide extremely important aesthetic value to neighborhoods and communities. Natural, undeveloped floodplains provide storage for storm flows, minimizing downstream flooding. 6. Direct runoff over veqetated areas Discharging runoff from roofs, roads, and parking lots into vegetated areas, rather than directly into storm drains offers an opportunity for infiltration of storm water runoff into the ground. Infiltration of storm water runoff reduces both the quantity of water and the amount of pollutants that would otherwise reach a stream or lake. Landscaped and vegetated areas, particularly in commercial and multi-family residential settings, also provide aesthetic value. 7. Use Texas SmartScape plants Landscaped areas, with all of their benefits, can also contribute to the pollution of streams and lakes if they are not managed properly. Using native plants, and those that have been adapted to the local climate and conditions, decreases the potential for water pollution by reducing the amount of water, pesticides, and fertilizer that must be applied to keep the plants healthy -and saves money. Texas SmartScape is an interactive multimedia tool on compact disk that can be used to select native and adapted plants for North Texas (see reference information). 8. Consider ways to reduce car travel Automobiles impact the environment in several ways. Pollutants in car exhaust account for almost one-half of the ozone air pollution in the region. Oil, grease, and metals from cars are washed into streams and lakes when storm water runs off of roads and parking lots. As the number of cars on the road and congestion increases, more air and water pollution will result. Locating developments near transit facilities, incorporating bicycle and pedestrian trails, and/or including a mix of residential and commercial uses can lead to a reduction in automobile travel. 9. Incorporate storm water treatment controls Detention and retention ponds, infiltration basins, and oil /grit separators are devices that "treat" storm water runoff before it is discharged into the nearby stream or lake. Treatment controls (except oil/grit separators) should be considered only after all other Keys to Developing Naturally have been explored and implemented to the greatest extent possible. In many cases, the need for these "treatment" or "structural" controls can be avoided altogether, or they can be reduced in size if the amount of runoff and entrained pollutants are minimizec by the design of the project. Generally, it is cheaper and more effective to implement design elements that prevent or reduce the generation of storm water runoff and/or pollutants at the source. 10. Use site controls to manaqe litter Litter that ends up in streams and lakes is more than an eyesore, it can affect water utilities, residents, and wildlife. In commercial areas, inlet controls and wind breaks can be very effective in preventing litter and debris from being discharged into our waterways. Reference information For more information and references to design manuals, including the Texas SmartScape CD, please refer to the companion Guide to Developing Naturally. The Guide is available at no charge from most North Texas cities and counties or from the North Central Texas Council of Governments. The Guide can be downloaded from the NCTCOG Storm Water web at www.dfwstormwater.com. or you may request a copy by calling 817.695.9210. For specific development requirements, contact the development services department in your city. St'lflJbarated .WaTermanagementi ___1_1 ·Oriiiiirii................_·......_iil'hMiIIdiiIiii .J..' Overview of Meeting000 ' o Overall Project Update .. o Manual Content Details o 8MP Construction Manual Update o Project WebsKes ~IProject Purpose000 " Providing a comprehensive guideline for Integrated Storm Water Management throughoUt the planning, design, construction and maintenance of storm water infrastructure 1 ------------------900 Project Team I ,iCfCOG~I !0;-0 Tn........ • I r= , ~-"'I I -. -t _~,~I'e' i __ ----,Ii.PI!..te" I IIoIIC-PCi--"' . I -_PI!Io.iotl'lli::f,F'Il_Ie!-..cpr;p _illfmw'M!t!n Iwe,::;'"'--"' --"', ----CoIIoft._,,.--"' I .:...._.t.--~---lrI_."--"'___ft! F!WIIWlend~~---,1lJIIn1"llrnmer &~---""'".""""-.¢IProject Overview 000 o Develop a step-by-step detailed instructional document • Control and management of storm water quality and qu.anlity for new and ",dev..lopment • Guide for developers and gm water controls and BMPs o Guidelines for inspec:tio~ and ~intenance 2 ~IFive-Yea~Plan 000 I;r...~tmol I I. fYlOM ....."""'" I """" I u~--'.W.......""-IkrrIn omtflftlallSWM:Do"...."~... Sb:I~. W~ ~ PJog,.rnlW ~:'""j-I'~ -.-.....,MMuaI"j'=,-....I ~ I I l:~ooi:.!IThe Benefits o Address storm water issues o A "How-To· guldo in•Ihmugh crosscity limits slonn waler management . 0 Improve Overall stonn for all phases !Ifa pl'Qj'ect water qU1!tity throughout o Up-to-date regIDatiOl'IS the Region and polK:ies Q Level the playing field o St8ndatdizatioo of across the Region ,..,.,...es o A regionally-based o lJser~friendly in!&ractive ~ comprehensive drainage on-line manual "',,,,,,,"" , Edut.ation anrl T~ I , Critical Dates e=i~_,---,-. ---,3 ------000 I 000 ~ICritical Dates HCTCOG ISWM 1 "1"1' :... :::r=l :...d~,F . 1-:==:... I I fl~ ,..,....--.......,~~~...--I I....,.,w~o.-I fie9'iw......,.,~r~3~.,...~ ~iSWM Manual Outline . 0 Volume 1 -Policy Guidelines o Volume 2 -Design Manual 4 ~IVolume 1 -Policy Guide 0'00 o Chapter One -Case for Stormwater Management • Impacts of Development and Stonnwater Runoff • Slormwater Impacts • Addressing Runoff Impacts Through Stormwater Management. ~,I Volume 1 -Policy Guide 000 o Chapter 2 -Regulator-y Requirements for Coo1munitles • Overview • Storrnwater Quantity and FJood • Prevention Regulations ;. Water Quality Regulations :4./Volume 1 -Policy Guide 000 o Chapter 3 -Local Stonmwater Management. Programs • Overview of local StoImwaler Management Programs • DeveJopil19 an Effectlve Local Slorrm.vater Management Program 5 000 Rt IVolume 1 -Policy Guide o Chapter 4 -Implementing StorTDwater Management Requirements for Devefopment " .CNeI'lriew " Minimum Standards fur Oevelopment " Stotrrr.vatet Better Sill! De$lgn Prad.lcoo " Unified stormwaler SiZIng Crilefia " Slolmwater Site Oes.ign Ctedtts " Downstream~~nI$ • Guidance on structural S\ormwaler Controls " Stormwater Mlmagemenl SUe Plans :d./Volume 1 -Policy Guide 000 o Chapter 5...:. Watershed-Based Stonnwaler Planning • slofTlM'ater Master Planning • ComprehefllWe Walef$hed Rannfng fbr Communities • Integratiorl O'f Sile and Watershed-Level Stormwater Planning • Inter-,..nisdicI.k:IrnJIWalel"$hed Planning " JrnpfementaUon ofWatersl\ed ptans " Regional vs. 010-$11$ SllJ'lTlWatef Management Rt /Volume 1 -Policy Guide 000 o Chapter 6 -Flood Plain Management .' local Flood Plain Management and Stonnwater Management • National Flood InSUl'ance PrOgram • StIategies and Tools for Improved Flood ?fain Management 6 000 ~IVolume 1 -Policy Guide' o Chapter 7 -Stormwllter System Operations and Maintenance • Local Stormwater Operations and Maintenance Programs • Implementing An Effective ~MProgram • Stormwater Retrofitting ~·I VOI~me 1 -Policy Guide 000 o Chapter 8 -Stormwater Pollufion prevention Programs • Siormwater ?dilution Prevention ~IVolume 1 -Policy Guide 000 o Chapter.9-lnformalion Tools for Local Stormwater Management • Overview • stormwster Management System Inventories • Geographic Information Systems • Global Positioning Systems • Remote Sensing • Computer Models 7 ~IVolume 1 -Policy Guide 000 . o Appendix' A -Contact Agenices for Stormwater Management Regulations arid Programs o Appendix 8 -Stormwater Site Plan Review Checklist o Appendix C -Example Stormwater Facility Mairrtenance Agreement d./Volume 2 --Design Manual 000.. o Chapter 1 ~Stormweter Management Planning and Design. • Need for Stormwater Management • Stormwater Management Standards • Unified Stormwater $iz.ing Criteria • Storrnwater Better Site Design • Stormwater Site Planning ~IVolume 2 -Design Ma~ual 0.00 . . 0 Chapter 2 -Stormwater Hydrology • Methods for Estimating Stormwaler Runoff • Storage Design • oUtlet Structures /! /8 ~IVolume 2 -Design Manual oo~ o Chapter 3 -Structural Siormwater Controls . • Structural stormwaler Conlrols Overview • General Application Str'I.tCtoral Stormwater Centrols • Umited Application Structural Stom'iW'aler Controls • Delentlon Structural stormwater Controls ~JVolume 2 -Design Manual o Chapter 4 -Stormwater Drainage System Design • Stormwater Drainage Design Overview • Minor Drainage System Design • Culvert Design • Open Channef Design • Energy DIsSipation DesIgn ~IVolume 2 -Design Manual 000 0' Appendix A -Rainfall Tables 0' Appendix B -Soils Information 0' Appendix C -~laneoosSpecifications. 0' Appendix 0 -Structurai StomtYiater Control Design Examples o Appendix E_-Structural Controf Maintenance Checklists . 0' Appendix F -Landscaping and Aesthetics Guidance o Appendix G -Stormwater Computer Models • Appendix H -Safe Dams N:A (Georgia) 9 000 d_ iSWM Manual Update o Regional and National Manual Evaluation Completed o 'First Draft' Red-linelhlue-line Markup Completed o BMP Manual Update Questionnaire in Progress o Project WebsHe 90% Complete o. New Name and Logo Developed o Public Meetings in Progress ~ol B~P Update o 1993 Publication wI One Revision o Includes Individual BMPS • Emsion Contml • .I' hdlment Loss Prevention .. waste Management d.1. BMP Update 000 o Fact ~heets Provided For Individual Measures o Construction SpeCifications Provided For Appropriate Measures' o Examples .. SlIt fences.-.E1mJon~~."""u • Con:strur.:I:\Qn E.rrtranc:as 10 000 BMP Update~ Currerit Activities o Review of the Manual 0' Comparison to Current Practices • Loea!!y • other Ate;';\$ o Interviews with Local Governments. Developers, Contractors and Engineers o BMP Questionnaire ~stt IiSWM Website Components oo~ . o The Manual Review o Comments o Surveys· o Contact Information www.iswm.dfWinfo.com ;"",' StYPAarate .~ WaTermana ement OOQ -11 iNTEGRATED STORM WATER MANAGEMENT (iSWM) Project Review Team Steering Committee (16) Representation Representative Municipality DrainagelFloodplain Administration Gordon Scruggs City of The Colony DrainagelFloodplain Administration Steve Parker City of Dallas DrainageIFloodplain Administration Ed Witkowski City of Denton Environmental Management Katrina Martich City of Arlington Environmental Management Gene Rattan Tarrant County Planning Administration Planning Administration David Gattis City of Benbrook City Engineering Administration Tre Dibrell City of Hurst City Engineering Administration Lee Stimpson City of Plano City Engineering Administration Jim Dulac City of Richardson City Engineering Administration Thorn Guillory City of Garland City Engineering Administration Stan Ballard City ofTerrell City Engineering Administration Curt Caldwell City of Duncanville City Public Works Administration (Chair) Don McChesney City ofFort Worth City Public Works Administration Larry Barkman City of Cleburne ?????? ?????? Associated Advisors Federal/State Agencies US Army Corps of Engineers Texas Commission on Environmental Quality US Environmental Protection Agency Region 6 Texas Department of Transportation US Dept. of Housing and Urban Development Texas Parks and Wildlife Federal Emergency Management Agency Region VI Texas Water Development Board Professional Associations Council ofEngineering Companies Ft Worth Texas Public Works Association Council ofEngineering Companies Dallas American Society of Civil Engineers Home Builders Association Ft Wnrth American Society of Landscape Architects Home Builders Association Dallas Building Officials Association of Texas Associated General Contractors Highway/UtiUty Building Owners & Managers Association Associated General Contractors Quoin National Apartment Association American Institute of Architects Urban Land Institute American Planning Association Water Environment Association ofTexas Advocacy Organizations Private Development Interests Center for Watershed Protection Protection Low Impact Development Center Academia Project Consultants Freese and Nichols, Inc. AMEC Earth and Environmental, Inc. Alan Plummer and Associates Caffey Engineering, Inc. Project Coordinator North Central Texas Council of Governments 01/14/2003 North Central Texas Council of Governments Construction BMP Manual .OUR WATER The North Central Texas Council of Governments has initiated a project to revise and update the Storm Water Quality Best Management Practices for Construction Activities manual. The "Construction BMP Manual", first published in 1993, was developed to be a guide for those preparing or implementing a Storm Water Pollution Prevention Plan for a construction project. The manual is being revised to reflect the requirements of the soon to be released Texas Pollutant Discharge Elimination System (TPDES) General Permit for Discharges Associated with Construction Activities. In addition, the Storm Water Pollution Prevention Plan (SWPPP) design methodology and the BMPs will be updated to the current state of the art in control of pollutants from construction sites. A consultant team of Freese and Nichols, Inc. and Alan Plummer Associates will be assisting NCTCOG's Clean Construction Campaign (C3) Team (see box below) and NCTCOG staff on this project. The release of the 3'd Edition of the Construction BMP Manual is anticipated for April/May 2003. We are looking for input from the users of the Manual to assist in the development of the revised edition. A questionnaire on the Construction BMP Manual can be accessed at www.iswm.dfwinfo.com . Please log on to the site and complete the questionnaire by January 24, 2003 if possible, although we will continue to accept responses after that date. In addition to the survey, we will Norlh Otmral Te.us cond uct public meetings to receive comments on a draft of the manual prior to release. Please contact Jeff Rice, NCTCOG Project Coordinator, at jrice@dfwinfo.com or 817-695-9212 if you would like more information on the project to update the NCTCOG Construction BMP Manual. Storm Water Quality Best Management Practices fur Construction Adivi.ties The Clean Construction Campaign (C3) Team is an advisory group to NCTCOG's Public Works Council. The goal of C3 is to promote clean construction sites through improved communication, cooperation, and commitment, not through more regulations. The C3 Team will address multiple environmental issues related to construction including construction site runoff and waste control, construction and demolition debris recycling; and off-road diesel equipment emissions. <.TER <::.oNTROt~ESIGN EXAMPLES 01 Stormwater Pond 02 Bioretention Area 03 Sand Filter 04 Infiltration Trench 05 Enhanced Swale APPENDIX E -STRUCTURAL CONTROL MAINTENANCE CHECKLISTS APPENDIX F -LANDSCAPING AND AESTHETICS GUIDANCE APPENDIX G -STORMWATER COMPUTER MODELS APPENDIX H -NORTH TEXAS SAFE DAMS ACT ADDITIONAL COMMENTS: Volume 2 (Technical Handbook) North Texas Stormwater Management Manual iii TABLE OF CONTENTS FORWARD Preface......................................................................................................... ix Acknowledgements .................................... , .............................................. ix INTRODUCTION Objective of the Manual ......................... , .................................................... xl Organization of the Manual ............................................................... : ........ xi Regulatory Status of the Manual ........................... : ................................... xlii Users of this Volume .................................................................................. xi How to Use this' Volume .:............................................................. ............... xii How to G~t I'rinted Copi~sof,~~e Manual. ··T;::~:·:~~;:,:...:;:?J?:-;r1::~:·'l';... xiii -::l" '-.-~.:_;,. ~~>; ':;-!:, ,,:"',';. ~:-~ : ':'1[. .: How to Find the Manual oil theJnterneL...·~: ...........;!:, ...... !............ j:'j:'L ........ xiii Contact Infci'rmatio~:!i......';...~:(..; ........... "".:';,j:i,......:.Jr:~·.~'J............ifL....:... xiii . '..'~.(-' '._" -,-.~1". ''i ,.;~COMMENTS-.,,'_:,,:{: -,.,,"/,' __ .J", "'_ .-'i·.,_.~. _..._ ,~_..,~~:"'._ ,~<,>_>h-_ __,,::,~~_ CHAPTER 1.-THE CASE FOR STORMWATER MANAGEMENT 1.1 Impacts of Development and Stormwater Runoff ............................. 1-1 1.1.1 Development Changes Land-and Runoff ....; ............................. 1-1 1.1.2 Changes to Stream Flow ............................................... ........... 1-2 1.1.3 Changes to Stream Geometry· .................. :: .............................. 1-4, 1.1.4 Impacts to Aquatic Habitat. ............................................... : ....... 1-5 1.1.5 Water Quality Impacts .............................................................. 1-6 1.1.6 Stormwater Hotspots ................................................................ 1-8 1.1.7 Effects on Lakes, Reservoirs and Estuaries.... : ...... : .................. 1-9 1.2 Stormwater Impacts on North Texas Communities ......................... 1-9 1.3 Addressing Runoff Impacts Through Stormwater Management ..... 1·12· COMMENTS: Volume 1 (Policy Guidebook) North Texas SIQfT1lWater Management Manual CHAPTER 2 -REGULATORY REQUIREMENTS FOR NORTH TEXAS COMMUNITIES 2.1 Overview ............... : ................................................................................ 2-1 2.2 Stormwater Quantity and Flooding Prevention Regulations ............2-1 2.2.1 Na!ional Flood Insurance Program ................................ ; ........... 2-1 2.2.2 North Texas Safe Dams Act... .................................................. 2-1 2.3 Water Quality Regulations .••..•..••.........•..••..•••...... ; ....•.•..••.........•..•.••.•• 2-3 2.3.1 Municipal NPDES MS4 Stormwater Permit Program ................. 2-3 2.3.2 Industrial NPDES Stormwater Permit Program ........... : .............. 2-4 2.3.3 NPDES Stormwater Permits·for Construction Areas ..................2-4 2.3.4 NPDES Municipal Wastewater Discharge Permit Program .......2-4 2.3.5 Erosion and Sedimentation Control Act ......... : ... , ....................... 2-5 2.3.6 Total Maximum Daily Load Program ................. : ....................... 2-5 2.3.7 North Texas Planning Act -River Corridor Protection ..............2-5 2.3.8 North Texas Planning Act -Water Supply Watersheds ............2-5 2.3.9 North Texas Planning Act -Groundwater Recharge Areas .......2-6 2.3.10 Safe Drinking Water Act -Wellhead Protection Program ........2-6 2.3.11 Source Water Assessment Program .......................................2-6 2.3.f2jMelropl;llitanRiver..Rrotection~c;t .......:::~:{.::.:~:::.~;..:'~:-::::~i~:":~.~:!\..2-7 2.3.1(Wellarid!l-FeCleral~04 Perm!ts'~nd Nort~TeX!ls Plann['llg Act2-7 2.3.14:Coaslal Management Progra:m..'~' .........:{;',""'""~...........:,~..... , ... 2-7 2.3.15 ~CoaslaOl/lars~lands.Proteqlion ·AC!,........;ij; ..................;~..........2-7 2.3.~~..,:~gr!h Texas..C3rl:lensp~c.E3,r!ogra'!.l;:;c;;~:".:::"'" ....... :;;.{;;:. ...... 2·8 COMMENTS:' CHAPTER 3 -lOCAL STORMWATER MANAGEMENT PROGRAMS 3.1' Overview of Local Stormwater Management Programs ...................3-1 3.1.1 Introduction ...............................................................................3-1 3.1.2 Elements of a Comprehensive Locel Stormwater Management Program ..............................................................3-2 3.2' Developing an Effective Local Stormwater Management Program ............................................................ ; ••••...•.: ..................... 3-7 3.2.1 Introduclion ............................................................. ..................3-7 3.2.2 Defining Problems. Program Goals and Requirements .............3-7 3.2.3 Determining Program Components and Priorities ......................3-8 3.2.4 Organizing Program Structure and Staffing ...............................3-8 3.2.5 Funding the Program .................................................................3-11 3.2.6 Implementing the Program ............................................ , ........... 3-15 3.2.7 Conclusion ......................................... : ...................................... 3-15 . COMMENTS: North Texas Stormwater Management Manual Volume 1 (Policy Guidebook) ii CHAPTER 4 -IMPLEMENTING STORMWATER MANAGEMENT REQUIREMENTS fOR DEVELOPMENT 4.1 Overview ........................................................................ ; ...•.•.•......•......• 4-1 . 4.2 Minimum Standards for Development ...........•.................................... 4-2 4.2.1 Introduction...................................•......................................•. ;.: 4-2 4.2.2 Applioability .............................•............................... : ..... : .......... 4-3 4.2.3 Minimum Stormwater Management Standards .... : ... : ................ 4-4 4.3 Stormwater Better Site Design Practices .......................................... 4-5 4.3.1. Introduction.................................................. : ........•................... ·4-5 . 4.3.2 Suite of Stormwater BEitter.Site Design Practices ..................... 4-6 4.3.3 Implementing Stormwater Better Site Design ..•........................ : 4-9 COMMENTS: . 4.4 Unified Stormwater Sizing Criteria ......... : .......................................... 4-12 4.4.1 Introduction......•...............................•.......•................................ 4-12 a a • -' .·.·~"··•• • ••• ••••••••••• ~~···-•• , •• ·······I~.······.~....:~~.~ ....J".;~ ..~.;;. ••.• -+4 4 '2' Water Quality ..•. • -·".··~"N•.·._ r.·¥'''~.''N>~· '13 4.4.3 Channel Protection .............c::~~.; .............!:; ...... , •.••......::~,•.....••.•• 4-14 4.4.4; Overba~k FI'1odProtection .:...•·;;,...........L"..,.;............·;,~: ...."'..... 4-15 4.4.5 Extreme Flood Pf?tection )?:,,:;:;';;;........:~...................~:........... 4-15 4.4.6 Incorporating the Unified .Stormwater SiZ;i!1g Criteria >;~ .~... ' iiih{Oevelopment Requirements·~~::~:.:::::~'::............::::~:.'::..: ...... 4-16 4.5 Stormwater Site Design Credits ......................................................... 4-16 4.5.1 Introduction................ ............................................................... 4-16 4.5.2 Site Design Credit #1: Natural Area Conservation ...................4-4-17 . 4.5.3 Site DeSign Credit #2: Stream Buffers ..................................... 4-18 4.5.4 Site Design Credit #3: Vegetated Channels ............................. 4-18 4.5.5 Site Design Credit #4: Overland Flow Filtrati(;m I Groundwater Recharge Zones ................................................. 4-19 4.5.6 Site DeSign Credit #5: Environmentally Sensitive Large Lot Subdivisions ........ : .......................... .......................... 4-19 4.5.7 Implementing Stormwater Site Design Credits .......................... 4-20 4.6 Downstream ASsessments ........................................................ : ........ 4-20 4.6.1 Introduction.................................. : ............................................. 4-20 4.6.2 Reasons for Downstream Problems ....................................... .. 4-20 4.6.3 Downstream Assessments: The ''Ten-Percent'" Rule ................ 4-21 4.6.4 Adopting a Downstream Assessment Requirement.. ................ 4-22 COMMENTS: Volume 1 (Policy Guidebook) North T exo< Stormwater Management Manual iii" 4.7 Guidance on Structural Stormwater Controls ...•....................•4-22 4.7.1 Introduction....................................................................4-22 4.7.2 Recommended Structural Stonnwater Control Practices for North Texas Communities ....................................4-22 4.7.3 Suitability of Structural Stormwater Controls to Meet Stonnwater Management Requirements ...................................4-24 4.7.4 Implementing Application and Design Criteria for Structural Stonnwater Controls .................................................4-25 4.8 Stormwater Management Site Plans ........................................4-26 4.8.1 Introduction.....................................................................4-26 4.8..2 Contents of a Stonnwater Management Site Plan ........ .4-26 4.8.3 Procedure for RevieWing Stormwater Site Plans ............4-28 COMMENTS: CHAPTER 5 -WATERSHED-BASED STORMWATERPLANNING ""'-, """'c 5.1 St~7:f;tr~~u~~~~~~~~,~::~.:::::::::::::::::~;:::::::::::::::::::~:::::'::::::;f::::::::::~~~ 5.1.2 Types qfStomiwater;Master Planning ......::....................:.'.........5-1 5.2 compre'ii;ns'i~;wate~shed~la·nhing forN6ittl'TeXas Comri~nlties 5-3 5.2.1 Introduction ........ , .......................................... : ........................... 5-3 5.2.2 Scale of Watershed Management .............................................5-3 5.2.3 The Watershed Planning Process ............................................. 5-4 5.3 Integration of Site and Watershed-Level Stormwater Planning ........5-12 5.3.1 Introduction ...............................................................................5-12 5.3.2 Using the Local Review Process to Comply With Watershed Plans ....................... : .............................................. 5-12 5.4 Inter-jurisdictional Watershed Planning ............................... .............5-14 5.5 Implementation of Watershed Plans .............................~...................5-15 5.5.1 Introduction ...................................................................... ..........5-15 5.5.2 Tools of Watershed Management and Protection ......................5-15 5.5.3 Stakeholder Involvement Techniques .............. : ......................... 5-18 5.5.4 Cost (Budget) ....................................................................~ .......5-18 5.5.5 Performance Monitoring and Assessment.. ............................... 5-19 5.6 Regional vs. On-site Stormwater Management .................................5-19 5.6.1 Introduction ..................................................................... : ......... 5-19 5.6.2 Advantages and Disadvantages of Regional Stonnwater Controls .................................................................5-20 5.6.3 Important Considerations for the Use of Regional Stonnwater Controls .... :.:.: ........................................................ 5-21 COMMENis: iv North Texas Sforrnwoter Management Manual Volume 1 (Policy Guidebook) CHAPTER 6 -FLOODPLAIN MANAGEMENT 6.1 Local Floodplain Management and Stormwater Management .....••..• 6-1 6.1.1 Introduclion................... , ..................................................... ... : .. 6-1 6.1..2 Floodplain Management Goals ................................................. 6-1 6:2 National Flood Insurance Program ..................................................... 6-2 6.2.1 BaCKground .............................................................................. 6-2 6.2.2 NFIP Program Requirements ....... : ............................................ 6-2 6.2.3 Shortcomings of the NFIP ... , ............................................. : ....... 6-4 6.3 strategies and Tools for Improved Floodplain Management· ............ 6-4 . 6.3.1 Introduction............... :, .............................................................. 6-4 6.3.2 Developing an Effective Local Floodplain Management Program ................................... ........................... 6-4 6.3.3 Watershed linter-jurisdictional Issues ...................................... 6-7 COMMENTS: CHAPTER 7 -'STORMWATER SYSTEM OPERATIONS "AND MAINTENANCE 'J{\ '::£, .: ":, ,~:S"?:, :i~' ,: f" irf;;i : 7.1 Local §tormwater Operations and Maintenanc~ Programs .';;....•..••,. 7-1 7.1.!( Introdu~iion 7-1.. ;::.,.;: ............. ;."'",.i;;~,........g~~-:' ::·~:1...........:~,........... 7.1.2", Key Maintenance Program COmp8f1ent~1...................f(; ........... 7-1 7.2 Imple~~'ltjn~ An Effective'6perations~1ta lVi~lntenance-":L_ Program ....... ; ...... ; ......................... ; ............ : ......................................... 7-3 7.2.1 Maintenance Responsibility ............. : ................ : ....................... 7-3 7.2.2 Level of Service ........................................................................ 7-4 7.2.3 Establishing Maintenance Responsibility and Level of Service Policies ................... ................................................. 7-5 7.2.4 Maintenance Agreements ......................................................... 7-6 7.2.5 Education ...................................... ........................................... 7-6 7.2.6 Periodic Review of Regulations and Procec;lures ...................... 7-7 7.3 Stormwater Retrofitting .......................................... .............................7-7 7.3.1 ·Introduclion........................................................ : ....................... 7-7 7.3.2 Stormwater Retrofitting Process ...................... ......................... 7-8 7.3.3 Types of Retrofitting Techniques .............................................. 7-10 COMMENTS: Volilme 1 (Policy Guidebook) North Texas Slormwater Management Manual V CHAPTER· 8 -STORMWATER POLLUTION PREVENTION PROGRAMS 8.1 Stormwater Pollution Prevention •...........•.•••...•...•.........•.•••••.••.••.........8-1 8.1.1 Introduction ............................... ................................................8-1 8.1.2 Local StorTnwater Pollution Prevention ActiVities .......................8-1 COMMENTS: CHAPTER 9 -INFORMATION TOOLS FOR LOCAL STORMWATER MANAGEMENT 9.1 Overview ...................................................... ; •.•..••..•••.••••..•.••.....••.••..•••••9-1 9.2 Stormwater Management System Inventories .••....•.......... .•.•••••..•..••...9-1 9.2.1 Introduction ...............................................................................9-1 9.2.29fgalfiiip~ Inti?rmatiqp ............,i\:........·:~;~r::::·::'!!.. W'.':~·:1g:~::"'}.. 9-2 9.2.3 90nducbl)g the Inventory ....... ,·..,',...........,:,...................... ; ......... 9-3)f ,y\~ _~;;,.__ ,"'~.t.\.'.--;'";;' /' ,,:,,-~::~ :K 9.3 Geographic Information Systems .":.·om';!:'••..••••••::' ................... f:: ......... 9-4· d t';" .: .J.". .~. ";.'. ...• ''';'' 9-4 . 9 3 1 I•• "tn fO uc fon .............. , ......... l ...........,·:........ " ....................1.......... -42 "G"'IS"C"" .,.it· ..'':c..._J.J._ ..~.':.,;:... _.• '''''''-_o\;:l._ 99.3. omponen s............................. .................... ............ .......... 9.3.3 GIS Functions ....................... ; ................................................... 9-5 9.3.4 Use of GIS in Stonnwater Management.. ............................. ..... 9-6 9.3.5 Other Related Technologies ... : .................................................. 9-8 9.4 Global Positioning Systems' ............................................................... 9-8 9.4.1 Introduction .: ....................................... : ..................................... 9-8 9.4.2 GPS Applications to Stonnwaler ...............................................9-9 9.5 Remote Sensing ................................................... , .............................. 9-9 9.5.1 Introduction ............................. : ........................................ ......... 9-9 9.5.2 Digital Orthophoto Quarter Quadrangles ...................................9-10 9.5.3 Remote Sensing Applications for Stonnwater ..: ........................ 9-11 9.6 Computer Models ............................................................ : ................... 9·12 9.6.1 Introduction ........................................................................ .......9·12 9.6.2 Types of Models........................................................................9-12 9.6.3 Model Applications .................... , ......................................... ...... 9·13 . 9.6.4 Basic Computer Modeling Principles .................................. , ...... 9-13 9.6.5 Selecting the Appropriate Computer Model ...............................9-14 COMMENTS: vi North Texas stormwoter Manogement Manuol Volume 1 (Policy Guidebook) APPENDIX A -CONTACT AGENCIES FOR STORMWATER MANAGEMENT REGULATIONS AND PROGRAMS APPENDIX 8 -STORMWATER SITE PLAN REVIEW CHECKLISTS APPENDIX C -EXAMPLE STORMWATER FACILITY MAINTENANCE AGREEMENT REFERENCES ADDITIONAL COMMENTS: Volume 1 (Policy Guidebook) North Texa, Slormwaler Management Manual vii List of Tables CHAPTER 1 1.1-1 Summary of Urban Stormwater Pollutants ......................................c. 1-7. CHAPTER 2 2.1-1 Regulatory Framework for local Stormwater Management in North Texas .... 2-2 2.3-1 Minimum Criteria for the Protection of Water Supply Watersheds in North Texas .................................:........................................: ......... .. 2-6 CHAPTER 3 3.1-1 Types of local Ordinances Used to Support Stormwater Management Activities ...... ... ... ... ... ... ... ... ...... ... . .. ... .............. '." ........................ 3-4 3.2-1 Stormwat'?r,Manag~JmJ,Eunctions ~asand e\,?gfllmc~0I'l)PQO~D~"'7'3-9 3.2:2 Example of Stormwater PJ'ogram Elements and Potentially Responsible "",:':;; ,.,!,,~ .:)~ , ".~': ".-, '.', Depai'tments 13nd Staff ...,." ............L .::...........;':..................:co.........3-10 3.2-3 Adv~~tages a~d Disadv~ritages of ptogratn FundirigAifproaches~~.. ..... 3-13 ,~.'.~~.J,..-:...•,_... _.. _._ .........._'"::):~ -j~~' ')':-~:Y", i.~_';hV'"'''C''' {1;~. .;:r: ' ;;~ ..,... ",,::,~ ~.~ ....v:--•. _'"~ :"1;\<_~~~~...", ,,; -*~~;/._CHAPTER 4 4.3-1 Questionnaire for Reviewing Local Development Regulations to Evaluate Compatibility with Stormwater Better SitE! Design Practices .................. 4-9 4.4-1 Summary of the Statewide Stormwater Sizing Criteria for Stormwater Control and Mitigation ..........................:........................................4-12 4.5-1 Summary of Better Site Design Practioes that Provide for Site Design Stormwater Credits ..........................: ...... : .....................................4-17 4.7-1 Suitability of Structural Stormwater Controls to Meet Unified Stormwater . Sizing Criteria ..............................................................................4-25 CHAPTER 5 5.2-1 Description of the Various Watershed Management Units .....................5-4 5.2-2 Example of SUbwatershed Management Alternatives from a Watershed Plan ..........................................................................................5- 11 5.5-1 land Use Planning Techniques ...................................................... 5-16 5.5-3 Potential Watershed Indicators ...................................................... 5-19 CHAPTERS 6.3-1 Approaches to Effective local Floodplain Management ........................6-5 CHAPTER 9 9.2-1 Infrastructure Information and Uses ............................................... .. 9-3 viii North Texas Stormwater Management Monuol Volume 1 (Policy Guidebook) List of Figures CHAPTER 1 1.1-1 Typical Changes in Land Surface for a Commercial Site ..................... 1-1 1.1-2 Changes in Hydrology and Runoff Due· to Development ....................... 1-2 1.1-3 Impervious Cover Increases Stormwater Runoff and Pollutants ............. 1-2 1.1-4 Increased Runoff Peaks and Volumes Increase Stream Flows and Flooding ................................... . ., .........................................., .... 1-3 1.1-5 Hydrograph under Pre-and'Post Development Conditions ..................., 1-3 1.1-6 Example of Stream Channel Bank Erosion .................: ...................... 1-4 1.1-7 Changes to a Stream's Physical Character due to Watershed Development ............................................................................. . 1-4 1.1:.a Impacts to Aquatic Habitat Can Eliminate Sensitive Fish Species and Other Aquatic Organisms .....................................................,........... 1-5 1.1-9 Causes of Water Quality Impairment in Norlh Texas ...................:............. 1-6 1.1-10 Trash and Debris Impact the Visual and Recreational Value of Waterbodies ....................,................. ....'" .................................. 1-8 1.1-11 Gas Stations are an Example of Potential Stonmwater Hotspots ............ 1-9 1.2-1 Flooding Endangers Human Life and Property ................... ................. 1-10 1.2-2 Water Quality Problems Due to Runoff Impact Drinking Water Supplies ·Vhitc. Commissioner Jeffrey A. Saitas, executive Direc/or TEXAS NATURAL RESOURCE CONSERVATION COMMISSION ProtecUIltJ Texas by Reducing and PreventilltJ Pollution July 8,2002 Mr. John Promise, P.E. Director ofEnvironmental Resources North Central Texas Council ofGovernments P.O. aox 5888 Arlington, Texas 76005-5888 Re: Proposed Comprehensive Drainage Criteria and Design Manual Dear Mr. Promise: Thank you for sharing infonnation on the Comprehensive Drainage Criteria and Design Manual, as proposed by the North Central Texas Council of Governments. This will be an effective tool for local governments and the development industry in addressing the impacts of post-construction stonn water runoff. The proposal to manage flood control concurrent with the quality ofrunoff, and to provide a consistent and integrated approach on a regional or watershed basis, is a much desired outcome ofany stonn water management plan. Texas Pollutant Discharge Elimination System (TPDES) stonn water permits for municipal stonn sewer systems will contain the requirement that operators of these systems develop a minimum control measure for areas ofnew development and re-development. The TPDES general permit for Phase nsystems will be issued by December 2002. Development ofthe proposed manual, consistent with the requirements of this pennit, will result in a valuable tool for pennittees. If I can provide you any information or assistance regarding the TPDES stonn water pennitting progrgm, do not hesitgte to contact me directly at (512) 239-4527. Stephen M. Ligon, Team Leader Stonn Water & General Permits Wastewater Permitting Section SMUmam P.O. Box 13087 • Austin, Texas 78711-3087 • 512/239-1000 • Internet address: www.tnrcc.state.tx.us IlrmleJ;m r~0'(lcd paJloT UliIll!: so)'·bJ~d ink • Where are we today? -NCTCOG securing funding and commitment of the Region -Assessing Regional needs and developing the content of the manual -Gathering existing drainage criteria and design guidelines to establish a regional baseline 1 • Fit site plans to the natural drainage system, not the drainage system to the site plan layout • Provide low maintenance, environmentally sensitive management of storm water quantity and quality • Meet EPA/TNRCC Post construction and TPDES General Permit Requirements ... ·J)rc?j·•...••..•.. • Provide development of enhanced community desirability and value • Consistency in design and review of drainage plans • Expedited development process 2 1 Initial,Today -1012002, 1...., ---'Fl'2=0""03'---_ I'.+-_~FY"_!.::20~04!....-_, 1 • FY200S -2007, Development of Draft: Comprehensive , Drainage Crll>!ria lit Design Manual • Project Goals and Objectives -To develop a step-by-step detailed instructional document to guide developers and government agencies on the control and management of storm water quality and quantity on new developments and retrofitting/redevelopment of existing areas 3 • Manual Development • Development of Project Team website • Monthly Commi1tee and Stakeholder Meetings • Quarterly Updates (Meetings & Documents) • On-going website updates Quantity & Quality • Consists of blocks and layers that will grow with each edition • Flexible yet has uniform, consistent provisions for specific levels of service • Applicable to projects of all sizes and locations in the region • Meets MS4 storm water post construction requirements "'~ 4 • CD format with on-line compatibility • Links to web-sites and other technical data will be provided • Developed for tables, spreadsheets, and technical equations to be interactive and programmed for direct access by user • User friendly and specific to North Texas Region General outline of the manual components • Introduction -I mpacts of development on storm water runoff -Permitting processes -Minimum perfonmance standards 5 ----------! ,-~..-.."'-"'-....-: =I;~""";==-.:::.::r' : r;~,',L_ =;;:;:''';.,"=...' __a..._",~ ~$!:ib-?ck1:,~?; • Pre-Platting and Site Design • Minimum design standards and permit requirements • Uniform Storm Water sizina criteria • Hydrologic Analysis -Precipitation -Soil Conditions -Computationol Methods 6 Non-Erosive Design • Hydraulics -Storage Design' -Open Chonnels -Culverts & Bridges -Streets ond Storm Sewers -Overland Flow -• Floodplain and Watershed Analysis -Watershed Modeling -Backwater AnalysiS -Riparian Zones and Encroachments 7 • Bank Stabilization • Strea m Restoration • Erosion and Sediment Control -Construction Phose -Post Construction ,CDCC), ... ,.... • final Manual • Draft Ordinances • Implementation Plan for Manual • Development of Case Studies • Committee and Stakeholder Meetings • Construction Guidelines and Standards to Implement BMP's • On-going Website Updates 8 • Comprehensive Watershed Strategies • GIS based Watershed Parameters • GIS based Regional Floodplain Mapping and Modeling • React to EPA and TNRCC Directives • Cooperative Effort between NCTCOG and FNI Team • Development of Interactive CD for Training and Education • On-site Training Classes for Municipalities with Hands-on Use of Manual • Training Classes for Private Consultants, Developers and Contractors 9 Inilial FY2003 FY2004 1I··.+---'-'-="--_+-_ ••FY2005 -200~ ,----:!~~~ $800,000 Developman! 01 Draft Comprehensive Droinag6 Criteria & Design Manual • MS4 Cities and Cities over 10,000 -Bose Fee [equally allocated 1/2 of FY2003 cost) -Population based Fee (1/4 of FY2003 cost) -Land area based Fee (1/4 of FY2003 cost) • MS4 Counties -Base Fee • All other local governments & private stakeholders -'h of Base Fee 10 • Local Cost-Shares • Competitive Grants • Other Contributors (private sector) • Commonalify of drainage standards • Shorter review times, maximizing staff resources • More confidence in engineering submittals • Proactive approach to meet storm water regulation • Take advantage of NCTCOG's education and training program • Improved qualify of storm water discharge 11 • Updating of criteria and methods • More precise, user friendly, and interactive computational methods • Design with less ambiguity • Integrated quantity and quality planning and system design • Uniformity of criteria in the region should ease design and reduce construction costs • Limit flooding impact upstream and downstream of developments • Provides an up-to-date comprehensive manual at a significantly lower cost than doing it yourself • All the some benefits as those that already have a manual 12 • Level playing field for drainage across the region • No surprises when doing projects in various cities • Reduced time in processing development plans • Developments that enhance natural features and increase property values • Greater ease in meeting regulatory requirements • Standardized design criteria across the region • Less ambiguity in analysis requirements and criteria interpretation • Updated modeling standards and parameter values Ii;• Training opportunities &~, • Standardized design reviews nJ1 J ~ 13 • Uniformity in constructed'facilities • TPDES permit requirements will be better defined and standardized • BMP designs should be site specific and more effective • Construction management effort should be reduced • Site inspections will become consistent across the region • Post Construction pollution problems greatly reduced • New developments will be environmentally friendly • Mitigation of flood damage due to new construction • Open space/Green space enhanced • Opportunity for sustainable growth developments • Enhancement of overall quality of life in the region 14 • Development and re-development planning process must be re-ordered and re-thought to integrate storm water management • Desired end result requires a knowledge and fully committed multi-disciplinary team: -Developer -Planner -Engineer -Ciiy Council Ciiy Management -Planning Engineering Environmental-Inspedians • Using regional storm water approaches across city limits • Continue to work with local governments and other stakeholders for participation • Continue Public Outreach & Education on Storm Water Issues • Research and Compile Existing Drainage Ordinances and Manuals • Obtain Necessary Dollars to Begin Project and Manual Development in FY2003 15 . J""'-il Comprehensive Drainage Criteria and Design What it is and why you should participate ... The P:roja:±.: In response to the The Pu:r:p::>se: Unprecedented regulations and to address the issues new development along with aging and facing the region, the North Central often inadequate infrastructure has Texas Council ofGovernmentsintensified problems with downstream erosion and flooding. Since these (NCTCOG) has taken a leading role in the development ofa comprehensive problems are multi-jurisdictional, the region-wide variation in drainage design criteria hinders effective management. Additionally, concerns about the impact of storm water runoff quality to surface and groundwater supplies, recreational rivers and lakes, aquatic habitats and ecosystems, as well as TPDES storm water permit rules, are making it necessary for local governments to address both storm water quantity and quality for areas ofnew development or redevelopment. Comprehensive guidance in integrated storm water management throughout planning, design, construction, and maintenance ofstorm water infrastructures is currently nonexistent in North Central Texas. ',.::; !I· , :::: . I , <,:",,:_~,,::;:"5=~-:-> .-r/L\; What is Required? The TPDES regulations require the operator of a regulated MS4 to develop, implement, and enforce a program to reduce pollutants in storm water runoff to their MS4 from construction and post construction activities. drainage criteria and design manual for the Region. This manual will detail the most current and applicable storm water management techniques, provide criteria and rationales for the selection ofstructural and non-structural water quantity and quality Best Management Practices (BMPs). The manual will also include detailed design specifications for these controls, and techniques for integrating storm water quality and quantity considerations. Essential aspects ofthe manual include: • Storm water goals, policies and planning • Integration ofstorm water quantity and quality considerations • Storm water design criteria for hydrology and hydraulics • Guidelines and procedures for storm water planning and design at both site and watershed level • Catalog ofstorm water controls and BMPs, and how they can be applied within the Region • Construction specifications for materials and workmanship • Guidelines for inspection and maintenance requirements for each control and BMP 'lhe Benefits: The regional Comprehensive 'lhe Critical I:ates: The first and most Drainage Criteria and Design Manual will provide: critical phase is to prepare the "Draft" manual. The • A comprehensive drainage resource with guidelines to manage and control both storm water quality and quantity that are tailored for our Region • A "How-To" guide to provide assistance in storm water management during the planning, design, construction, inspection and maintenance stages • Updates of the latest regulatory changes • A cost effective and consistent approach to ordinance development • Expedited design, development and construction processes • Standardization ofprocesses across the Region • Easy-to-use training and edncation plan • User friendly, interactive website fur immediate access to manual guidelines and examples • A needed resource developed in a cooperative and cost-effective manner Development of Draft Comprehensive Drainage Criteria &. Design Manual following is a sununary of the critical dates • Gain Gain conunitment offunding from local governments and stakeholders -Sununer 2002 • Continue public outreach and education on storm water issues -Ongoing • Obtain first year funding for projectSeptember 2002 • Research and compile existing drainage ordinances and manuals -September 2002 • MS4 jurisdictions reference NCTCOG CDCD Manual as a post construction measure for Phase npermits March 2003 • Manual development -October 2002 to September 2003 • Final "Draft" Manual to Cities September 2003 • Final CDCD Manual-September 2004 • Implementation and adoption of manual-" Ongoing • Implementation and development of training, educations and regional concepts Ongoing 'lhe Plan: The CDCD Manual has been proposed as a multi-phased plan as shown: Initial I Today -10/2002 ...._--=F'-'Y"'2::cOO=-=3'--__... ..._---:F'-Y=20::.;0;::4'---_... I FY2005 -2007 ... I> Education and Traini Your Stonn water Solution: The CDCD Manual is a comprehensive manual to be developed to meet the specific regional needs of local governments in North Central Texas. We need your input and funding assistance in making this vital project successful. For more information on this project, please contact NCTCOG project manager, Kenneth Calhoun at 817/695-9224 or at kermy@dfwinfo.com. FY2003 FUNDING COMMITMENT RESPONSE FORM Regional Public Works Program Including Comprehensive Drainage Criteria & Design Manual __ I hereby indicate my entity's commitment to participate in the Regional Public Works Program. Please bill me in FY2003 for the amount of$______, __ I hereby indicate my entity will not participate in the Regional Public Works Program. __ I am still considering my entity's participation in the Regional Public Works Program and need additional information as indicated below. Name Municipality or Company Title or Position Signature Comments: Please mail this form to: Kenneth Calhoun Department ofEnvironrnental Resources North Central Texas Council of Goverlnnents P.O. Box 5888 Arlington, TX 76005-5888 or fax to the attention of Kenneth Calhoun at 817/695-9191 Questions? Kenneth Calhoun at 817/695-9224 or Sam Brush at 817/695-9213 Cost Share Allocations Attached is a table of cost share allocations for MS4 jurisdictions. Those not found on the attached table are requested to participate in the amount of $2353.00. Invoices will be sent in October based on commitment forms received. Comprehensive Drainage Criteria and Design Manual Fiscal Year 2003 Program Participation Cost Share MS4 Jurisdictions and Cities over 10,000 Population Jurisdiction ;Addison Allen Arlington Azle Balch Springs Bedfurd Benbrook ;Blue Mound IBurieson 'Carrollton :CedarHill Cleburne Cockrell Hill Colleyville Collin County Coppell :Corinth Corsicana Crowley Dallas Dallas County Population Area FY 2003 2001 2025 (Acres) Cost Share (Current) (Pro!ected) ($) 14,623 22,300 2,833 48,397 89,000 16,853 338127 438,500 63,363 9,660 13,750 5,274 19,444 22650 5,160 47,309 55,400 6405 20,268 25,900 7,713 2,388 2400 344 22510 49050 12610 111,388 128,700 23,447 33,954 69,150 22550 26,604 27,850 19,492 4447 3600 371 19,831 37,550 8,382 36,845 38,650 9,530 13,455 18,000 5057 24,571 24,571 13,891 7,594 14,150 4,256 1,199,809 1,264,750 246,347 I 5,587 8,944 22,009 5,596 5,759 6,657 6,125 4,792' 7.444i 10,082: 9015: 7,290 4806 6632: 4,706 6,519 56721 6633 55411 57,480: 4,706' Dalworthin~ton Gardens 2,218 5,450 I 187 4,993 Denton 82,976 132700 39,879 12347 Denton County 4,706 DeSoto 38,214 61100 13 809 7763 Double Oak 2,229 5,950 1,396 5,032 Duncanville 36206 36,05( 7,224 6,199 Edl!CCliffVil1a~e 2,555 3,150 762 4,859 :Ennis 16,200 21,000 11 771 6,419' Euless 46166 62,550 10407 7346 Everman 5839 5,800 1,269 4957 Farmers Branch 27,527 29,500 7,687 6.141: Flower Mound 52,604 88,650: 27640 9,957: Foresl Hill 12,949 13,550 2,717 5,2781 Fort Worth 542,504 675,600 191,252 40,505 Frisco 42,511 130,450 44,818 13,408; Garland 218,891 242,050 36544 13903: Grand Prairie 131,393 193,400 52175 15,074. Grapevine 42,443 43,650 22,942 7,973 Greenville 24,163 24,163 22,208 7,467 Haltom City 39297 38,250 7941 6304 Hickory Creek 2,269 5,050 2,941 5,155 Population Area FY2003 IJ urisdidion 2001 2025 (Acres) CoslShare (Current) (Projected) ($) , Highland Park 8,794 9,050 1,433 5,04i Highland Village 12391 19,500 4,101 5,647.. Hursl 36452 39,300 6,337 6,226 Hutchins 2805 2,650 5,515 5,318 ilrving 194,407 228,85 43,300 14,487 Keller 28,058 58,750 11 798 763~ Kennedale 5,982 14,000 3865 5521 :Lake Dallas 6,289 7,100 1,677 5039 Lake Worth 4629 5,050 1,614 4,983... Lakeside 1,075 1,075 968 4827 'Laneaster 26,270 29,350 18751 7276 Lawisville 80,609 11005 27,089 1O,249! Mansfield 29,777 73,200 23,365 9,314: McKinnev 58,986 125,600 37,353 1221O! Mesquite 126,570 168,100 27,811 11,744, :Midlothian 8,340 19,100 24,249 7,738 Mincral Wells 16,960 16,960 13,553 6,438 North Richland Hills 57,498 82,750 11 666 8,042 Pantego 2,432 3,75! 636 4,871 Plano 226460 312,750 45,831 17,346: Richardson 92,697 101,000 18,279 8,8291 Richland Hills 8132 1l,650 2,015 5213: ,River Oaks 7,010 6,250 1275 4,955'.. Rockwall 18,934 34,650 14,492 7,158 Rockwall County i 4,706-:Rowlett 45,643 72.350 • 12,954 7,975 Sachse 10,864 28,750 6,330 6,2411 Saginaw 13,290 24,100 4801 5,875' Sansom Park 4,181 3,950 792 4,8661 Seagoville 10,904 21500 10,425 6,386 Southlake 22,806 32,550 14,363 7,005i Stephenville 14956 14,951 6,428 5,674 Tarrant County 4,706 Terrell 13,606 136(jf 1I934 6,203 :TheColony 28841 45,900 10,068 6969, 'University Park 23,218 20000 2385 5320 Watauga 22101 28550 2,667 5,683 Waxahachie 21609 34,900 26,344 8,325, Weatherford 19,381 32,450 14,498 7,070!.---Westworth Village 2,124 2,050 1,266 4,876 White Settlement 14,958 16,250 3,118 5,386! Wihner 3,393 2,800. 4,028 5,1641 Wylie 16,711 29,200 21,308 7,6811 • 2025 Projeeted popUlation estimates unavailable, amount shown same as 2001 populatioo. .. .·Tti4~jlY.A'u9lJst1;.2002 ·,1'O:30"1l:4§a;rrlo ....... NClrCOG Gfflces . 6~6.pi)( Fi~gs;prive ,·AriiiJQ!OiJi;;n(16 11 "", ;;:~" ~ ': North Central Texas Council Of Governments TO: The North Central Texas Region l~~ DATE: July 22, 2002 FROM: Mike Eastland, Executive Directo;" fV SUBJECT: Follow-up on Request for Comprehensive Drainage Criteria & Design Project Participation Support for the Comprehensive Drainage Criteria & Design Project is rolling in! It is early in the process, but firm commitment to participate has been received so far from cities such as Denton. Wylie, Little Elm, Addison, Mansfield. and Stephenville. Indication of participation pending final budget approval has been received from Dallas County and the cities of Plano, Fort Worth, and Grand Prairie. Support is even coming from outside our region, as the City of Sherman is interested in being a player. The regulatory community is also taking notice as indicated in the attached letter from Steve Ligon, Storm Water & General Permits Team Leader for the Texas Natural Resources Conservation Commission (TNRCC). Mr. Ligon states, "This [CDCD Manualj will be an effective tool for local governments and the development industry in addressing the impacts of post-construction storm water runoff." We are fully aware that these are tough budget times but this is a unique and timely opportunity to develop a tool for this region that will be rivaled only by the Standard Specifications for Public Works Construction in its usefulness and universal applicability to the region. There is significant cost savings to be achieved through regional cooperation. Individual jurisdictions would expend many times more to develop such a manual, or even to just upgrade their existing drainage criteria to incorporate runoff quality considerations required by storm water regulations. As an additional benefit, participating jurisdictions will get discounted manuals and training opportunities. Other benefits derived from participating in this cooperative project are: • Long term cost savings to the jurisdiction • State of the art guidance and technologies • Consistent drainage assumptions and criteria throughout the region • Improved drainage designs and management • Reduced flooding risks • Easier compliance with regulatory permits (TPDES and 404) • Enhanced quality of life from "greener" drainage pOiicies • Reduced staff time to review and approve drainage plans • Better management of storm water from neighboring communities • Regional training opportunities for city staff and the development community We are hosting a project briefing on August 1 from 10:30 to 11 :45 am at the NCTCOG offices at 616 Six Flags Drive, Suite 200, in Arlington. There will be an in-depth presentation on the manual by the consultant team and an opportunity to have any questions that you might have answered. In the interim, additional information including a brochure, presentation, and participation/funding commitment response forms are available at www.dfwworks.com. Also, in an effort to establish a regional baseline, please send us your existing drainage criteria and design guidelines as we are compiling them to submit to the consultant team. Thank you for your consideration of this request. Please contact Kenneth Calhoun, Development Engineering Specialist, at 817-695-9224 or kcalhoun@dfwinfo.com for additional information, 616 Six Flags Drive, Centerpoint Two P. O. Box 5888, Arlington, Texas 76005-5888 (817) 640-3300 FAX: 817-640-7806 ® recycled paper http://ww.v.dfwinfo.com Robert J. Huston, Chairman R. B. "Ralph" Marquez, Commissioner Kathleen Hartnett \-\ihite, Commh.sioner Jeffrey A. Sailas, Executive Director TEXAS NATURAL RESOURCE CONSERVATION COMMISSION Protecling Texas by Reducing and Preventing Pollution July 8,2002 Mr, John Promise, P.E. Director ofEnvironmental Resources North Central Texas Council ofGovernments P.O. .eox 5888 Arlington, Texas 76005-5888 Re: Proposed Comprehensive Drainage Criteria and Design Manual Dear Mr. Promise: Thank you for sharing information on the Comprehensive Drainage Criteria and Design Manual, as proposed by the North Central Texas Council of Governments. This will be an effective tool for local governments and the development industry in addressing the impacts of post-construction storm water runoff. The proposal to manage flood control concurrent with the quality ofrunoff, and to provide a consistent and integrated approach on a regional or watershed basis, is a much desired outcome of any storm water management plan. Texas Pollutant Discharge Elimination System (TPDES) storm water permits for municipal storm sewer systems will contain the requirement that operators of these systems develop a minimum control measure for areas ofnew development and re-development. The TPDES general permit for Phase II systems will be issued by December 2002. Development oftheproposed manual, consistent with the requirements ofthis permit, will result in a valuable tool for permittees. If I can provide you any information or assistance regarding the TPDES storm water permitting program, do not hesitate to contact me directly at (512) 239-4527. Sincerely, ~~ Stephen M. Ligon, Team Leader Storm Water & General Permits Wastewater Permitting Section SMUmam P.O. Box 13087 • Austin, Texas 78711-3087 • 5121239·1000 • Internet address: www.tnrcc.state.tx.us prinlN on re(,d~J paper u~jnJ.! :\(l~-h~~d 10k