Public storm sewer pipes shall be designed to carry peak flows as determined by the methods previously described herein. All storm sewers shall be designed for the ten-year storm event. The 100-year storm shall be used as a check storm to confirm storm water containment at levels below the rim opening to prevent surcharging. Manning’s Equation shall be used to calculate pipe flow and velocity. A listing of the Manning’s Equation roughness coefficients for various pipe materials may be found in the Kentucky Department of Highways Design Manual or the Louisville Metropolitan Sewer District Design Manual.
(Ord. 012-118, passed 10-8-2012)