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(A) Evaluation according to contents of design manual. All stormwater control measures and stormwater treatment practices (also referred to as Best Management Practices, or BMPs) required under this subchapter shall be evaluated by the Stormwater Manager according to the policies, criteria, and information, including technical specifications and standards and the specific design criteria for each stormwater practice, in the design manual. The Stormwater Manager shall determine whether proposed BMPs will be adequate to meet the requirements of this subchapter.
(B) Determination of adequacy; presumptions and alternatives. Stormwater treatment practices that are designed, constructed, and maintained in accordance with the criteria and specifications in the design manual will be presumed to meet the minimum water quality and quantity performance standards of this subchapter. Whenever an applicant proposes to utilize a practice or practices not designed and constructed in accordance with the criteria and specifications in the design manual, the applicant shall have the burden of demonstrating that the practice(s) will satisfy the minimum water quality and quantity performance standards of this subchapter. The Stormwater Manager may require the applicant to provide the documentation, calculations, and examples necessary for the Stormwater Manager to determine whether such an affirmative showing is made.
(C) Separation from seasonal high water table. For BMPs that require a separation from the seasonal high-water table, the separation shall be provided by at least 12 inches of naturally occurring soil above the seasonal high-water table.
(Ord. 1538, passed 5-24-07)