(A) Protection of depressional storage. The stormwater storage capacity in wetlands and in natural storage areas identified in the Flood Insurance Study (Federal Emergency Management Agency, effective August 19, 2008), or latest dated successor study, shall be maintained. This stormwater storage capacity shall be maintained on the development site or shall be compensated within the watershed at a site designated by the Comptroller. Storage required to meet the stormwater detention criteria of this chapter shall be provided in addition to the existing identified depressional storage capacity.
(B) Protection of wetlands. Wetlands shall be protected from the adverse changes in runoff quality and quantity associated with land developments. In addition to other requirements of this code, the following mitigation criteria shall be met for all developments whose drainage flows into wetlands:
(1) The existing wetland shall be protected during construction by appropriate soil erosion and sediment control measures.
(2)
All runoff from the development shall be routed through a preliminary detention/ sedimentation basin designed to capture the two-year, 24-hour event and hold it for at least 24 hours, before being discharged to an existing wetland. This basin shall be constructed before property grading begins. In addition, the drainage hierarchy defined herein should be followed to minimize runoff volumes and rates being discharged to the wetland.
(3) A buffer strip at least 25 feet in width, preferably vegetated with native plant species, shall be maintained around the periphery of the wetland.
(Ord. 7-28, passed 5-9-07
; Am. Ord. 8-70, passed 7-16-08)
Penalty, see § 152.99