(A) If no release rate is specified in an adopted watershed plan, then sufficient flood storage shall be provided so that the site will not discharge at a rate greater than 0.15 cfs/acre of development during and after a rainfall event with a 100-year frequency except for sites exempted in § 160.012. Unless exempted in § 160.012, sites shall not discharge at a rate greater than 0.04 cfs/acre of development during and after a rainfall event with a 2-year frequency.
(B) This area of hydrologic disturbance on the site shall be used to calculate the required site runoff storage volume. The on-site watershed area tributary to the point of discharge shall be used to calculate the allowable release rate for the site runoff storage facility, which shall be the maximum release rate allowed considering only the on-site watershed area runoff.
(Ord. 06-0383, passed 3-15-06)