All storm water storage facilities shall meet the following standards.
(A) The boundary of the maximum water surface elevation of any detention facility resulting from a post-development 100-year return period storm shall be separated by not less than 25 feet horizontally from any building or structure.
(B) The maximum water surface elevation of any detention storage facility resulting from a post- development 100-year return period storm shall be at least two feet lower than the lowest finished floor of any building located on any property which uses the detention facility as a drainage outlet.
(C) Detention facilities that rely on human-made berms of any kind to hold back ponding water shall be provided with an automatic non-mechanical emergency by-pass drainage system capable of passing the flow resulting from a post-development 100-year return period storm without causing failure of the human-made berms or ponding greater than two feet above the maximum water surface elevation resulting from a post-development 100-year return period storm.
(D) Only dedicated drainage easements may be used for detention facilities. Any portion of a residential lot, combined utility/drainage easements, utility easements and traffic rights-of-way do not qualify for use as detention facilities.
(Ord. 17-97, passed 12-22-1997)