(A) Basins shall be constructed to temporarily detain the storm water runoff which exceeds the peak flow rate authorized by this chapter.
(B) The following minimum standards shall be observed:
(1) The maximum volume of water stored and subsequently released at the design release rate shall not result in a storage duration in excess of 48 hours unless additional storms occur within the period;
(2) All storm water detention facilities shall be separated by not less than 25 feet from any building or structure to be occupied and the lowest floor of any building or structure must be at least 1 foot above the 100-year storm water elevation of detention facilities;
(3) Safety screens shall be installed on all outlet control structures. Screens shall retain a sphere greater than 6 inches in diameter and shall have a screen area at least 6 times the end area of the outlet control structure;
(4) Danger signs shall be mounted at appropriate locations to warn of deep water, possible flooding conditions during storm periods and other dangers that exist. Fencing shall be provided if deemed necessary by the Commission. Design and locations must be approved by the Commission;
(5) Outlet control structures shall be designed to operate as simply as possible and shall be designed so as to require little or no maintenance and attention for proper operation;
(6) Emergency overflow facilities, like a weir or spillway, shall be provided for the release of exceptional storm runoffs, or in emergency conditions like the normal discharge devices becoming totally or partially inoperative. The overflow facility shall be of the design that its operation is automatic and does not require manual implementation; and
(7) Side slopes shall be in compliance with § 152.071.
(Ord. passed 10-11-2004)