CCP 08-20-2001 - Laserfiche WebLink

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I ~ I I I I I I I . I I I I I I (1) An outlet structure to control the one-year or two-year and lOa-year frequency events to pre-project peak runoff rates. (2) An identified overflow spillway sufficiently stabilized to convey flows greater than the lOa-year critical storm event. (3) Access for future maintenance. (f) Permanent sedimentation and water quality ponds are required and must be designed to provide: (1) Water quality features consistent with NURP criteria and District wet pond criteria (see appendix) . II'" A permanent wet pool with storage. of at least equal to runoff from a 2.5 rainfall over area tributary to the pond. dead the the (3) An outlet structure capable of preventing migration of floating debris and oils for at least the one-year storm. (4) Access for future maintenance. (g) The proposed project must not adversely affect water levels off the site during or after construction. (h) Storrnwater Management Plans under this rule must conform with approved Municipal Stormwater Management Plans. (i) Outfall structures within wetlands and public waters and public waters wetlands must incorporate a stilling- basin, surge-basin, energy dissipater, placement of ungrouted natural rock riprap or other devices to minimize disturbance and erosion of natural shoreline and bed resulting from stormwater discharges. (j) All new residential, commercial, industrial and other habitable or non-habitable structures must be constructed so that the lowest floor elevations are a minimum of two feet above the critical event lOa-year high water elevation and are one foot above the overflow elevation of nearby surface waterbodies wetlands and stormwater basi~s. 12 I