The design storm event return period shall be calculated as follows.
(A) Minor systems shall be designed to handle a 25-year, 24-hour rainfall event.
(B) Major systems shall be designed to handle a 50-year, 24-hour rainfall event.
(C) All systems shall include an investigation of the impact of the 100-year, 24-hour rainfall event, backwater from any perennial stream, and any flood plain encroachment.
(D) All systems which discharge into an existing drainage system, which has been determined by the local jurisdiction to be at or near maximum capacity, shall be designed for the storage of the excess storm runoff. The release rate shall be designed for the existing (redevelopment) five year, 24 hour event.
(Ord. passed - -)