Where part of a detention basin, excluding wetlands, will contain a permanent pool of water, the following additional requirements shall apply:
(A) If fish are to be maintained, a pond shall have a water area of at least ½ acre and a minimum depth of approximately 10 feet and a maximum of 20 feet shall be maintained over at least 25% of the pond area. The remaining pond area shall have no extensive shallow areas, except as required by § 152.097(C);
(B) Where fish are not to be maintained, the minimum depth shall be 8 feet and a maximum of 20 feet over at least 25% of the pond at permanent water level, or where a limiting layer prevents excavation to that depth, a minimum of 6 feet over at least 50% of the area shall be required;
(C) In excavated ponds, the underwater side slopes in the pond shall be stable. In the case of valley storage, natural slopes may be considered to be stable;
(D) A safety ledge measuring a minimum of 6 feet in width and a 10:1 slope is required and must be installed in all ponds approximately 30 inches below the permanent water level;
(E) Erosion control measures must be installed to prevent erosion from wave action and wet-dry cycles;
(F) Pond design shall facilitate periodic maintenance to control weed and larval growth; and
(G) Facilities to enhance and maintain pond water quality shall be provided if required to meet applicable water quality standards. Design calculations to substantiate the effectiveness of these facilities shall be submitted with final engineering plans. Agreements for the perpetual operation and maintenance of these facilities shall be prepared to the satisfaction of the Commission.
(Ord. passed 10-11-2004)