(A) If the hydrologic and hydraulic studies reveal that the proposed development or subdivision would not increase the total volume of runoff, the peak rate of runoff after development for all return periods of storms up to 100 years shall equal the pre-developed peak for all storm frequencies.
(B) If the hydrologic and hydraulic studies reveal that the total volume of runoff is increased, the peak rate of runoff from the critical storm, after development, shall not exceed the predevelopment peak rate of runoff from a one-year frequency storm for a 24-hour period. The critical storm shall be determined in accordance with the Detention/Retention Basin Manual and the peak rate of runoff for each storm of greater or lesser frequency shall be determined in accordance therewith. However, the peak rate of runoff after development may not exceed the peak rate of runoff before development.
(Ord. 1-91, passed 1-7-1991)