Runoff rate control Clause Samples

Runoff rate control. All runoff hydrological calculations shall be according to the methodology approved by the City Engineer. All storm water facilities shall be designed, installed and maintained to effectively accomplish the following: (a) Maintain predevelopment peak runoff rates for the 2-year, 24-hour storm event. (b) Maintain predevelopment peak runoff rates for the 10-year, 24-hour storm event. At a minimum the storm sewer conveyance system shall be designed for this storm event. (c) Low areas must have an acceptable overland drainage route with the proper transfer capacity when the storm event is exceeded. (d) Safely pass the 100-year, 24-hour storm event.