The capacity of on-street inlets on storm sewer systems shall not be less than the quantity of flow tributary to the inlet for the design storm. Inlets at low points or sags shall have extra capacity as a safeguard for street flooding from flows overtopping the street curb. Curb openings or combination inlets shall be used for overflows in the event that the grate is clogged. Special inlets may be required for streets with steep gradients to provide the extra capacity such situations require. The ten-year storm shall be used to design storm water inlets. Inlet capacity shall be checked for the 100-year design storm at site boundary points to ensure that the intent of the overall storm water management plan is being met. Design methodology utilized shall be similar to those presented in manuals produced by the state’s Transportation Cabinet.
(Ord. 012-118, passed 10-8-2012)