(a) If the hydrologic and hydraulic studies required in Section 1481.03 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 predeveloped 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 after development from the critical storm shall not exceed the predevelopment peak rate of runoff from a one-year frequency storm for a twenty-four hour period. The critical storm shall be determined in accordance with Section 1481.01(d) 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.
(c) Compliance with the section shall not be required if the proposed site is less than or equal to one-quarter of an acre (10,890 square-feet) and storm calculations substantiate that the existing storm sewer, creek or drainageways can hydraulically accept the increased storm water generated from this site without adverse effects to the system.
(Ord. 05-79. Passed 6-7-05.)