Here is the TxDOT Standard we were discussing this AM. Couple of items to note:
 
1. no matter what side slope 2:1 or 3:1 we use the footing will be 2' - 6" wide with the heel (back) = 9", the wall 9" which means the toe (front) will be 12"
 
2. if we use a 3:1 slope (from table on left side) the headwall length for one 36" pipe is 27' - 0" and you have to add 5' - 1" for each additional pipe which results in a total headwall
length of 37' - 1"
 
3. if we use 2:1 then the length for one 36" pipe is 19' - 0" plus 5' - 1" for each additional pipe which results in a headwall length of 29' - 1".
 
If we use 2:1 we either have to rip rap for a few out from the headwall or install a turf reinforcement mat installed to allow for vegetation to grow without washing out?
 
Comments? Suggestions? Thanks
 
Bill
 

William A. Parsons, PE
Project Manager
ARS Engineers, Inc.
5910 North Central Expressway, Suite 1000
Dallas, Texas 75206
214-739-3152 Phone
214-739-3169 Fax



This e-mail and any files transmitted with it are confidential and are intended solely for the use of the individual or entity to whom they are addressed. If you are NOT the intended
recipient or the person responsible for delivering the e-mail to the intended recipient, be advised that you have received this e-mail in error and that any use, dissemination, forwarding,
printing or copying this e-mail is strictly prohibited