Every Regulated Development shall at all times have in place a Plan approved by the City. In addition to such other requirements as the commissioner may set forth by regulation, the Plan shall include the following:
(a) Provisions for Stormwater Management:
(1) Rate Control. Stormwater Drainage Systems shall manage the peak rate of discharge from the Regulated Development, incorporating the maximum permissible release rate. Provided, however, that Developments that create an at-grade impervious surface of less than 7,500 substantially contiguous square feet and that directly discharge to waters shall not be subject to the rate control requirements of this subparagraph (a)(1).
(2) Volume Control. Stormwater drainage systems shall reduce the volume of runoff from a Regulated Development by one of the following measures:
(A) capture one-half inch of runoff from all impervious surfaces in accordance with volume control BMPs; or
(B) for Developments that do not directly discharge to waters or to a municipal separate storm sewer system, achieve a fifteen percent reduction in impervious surfaces from existing conditions.
(b) Provisions for sediment and erosion control.
(c) Provisions for operations and maintenance.
(Added Coun. J. 12-13-06, p. 95586, § 1)