11/28/2001 Env Bd Packet - Laserfiche WebLink

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(2) Provide sufficient dead storage volume to retain back -to -back 100 -year, twenty- four -hour rainfalls and runoff. (3) Do not create adverse downstream flooding or water quality conditions as a result of increased discharge rate or volume, or other factors. (m) All stormwater management structures and facilities must be properly maintained in perpetuity to assure that they continue to function as originally designed. This maintenance responsibility must be assumed either by the municipality's accepting the required easements dedicated to stormwater management purposes, or by the applicant executing and recording a maintenance agreement acceptable to the District. 4. REQUIRED EXHIBITS. The following exhibits must accompany the permit application. One set, full size; two sets, reduced to maximum size of 11 "x17." (a) Property lines and delineation of lands under ownership of the applicant. (b) Delineation of the subwatershed contributing runoff from off -site, proposed and existing subwatersheds on- site, emergency overflows, and drainageways. (c) Proposed and existing stormwater facilities' location, alignment and elevation. (d) Delineation of existing on -site wetland, marshes, shoreland and /or floodplain areas. (e) Identification of existing and proposed normal, and ordinary high and 100 -year water elevations on -site. (f) Identification of existing and proposed site contour elevations related to NGVD, 1929 datum. (g) Construction plans and specifications of all proposed stormwater management, facilities, including design details for outlet control structures. (h) Stormwater runoff volume and rate analyses for the one and 100 -year critical events, existing and proposed conditions. (i) All hydrologic, water quality, and hydraulic computations completed to design the proposed stormwater management facilities. 14