Laserfiche WebLink
Additional response regarding storage capacity of sediment pond by <br />office/shop area. <br />A capacity curve was derived from the enclosed plan view of the pond <br />and the culvert elevation determined. <br />All volume below the culvert invert is assumed to be "dead", that is <br />it will not drain by itself, but will be adequate for sediment storage. <br />1.48 acre-ft of water storage is required for a 10 year, 24 hour event <br />(Note: this assumes a CN of 89 which should be conservative). <br />The minimum elevation around the pond is 7433.1; if a one-foot freeboard <br />is maintained, then the maximum water level is 7432.1, which has a <br />capacity of 2.35 a-ft. <br />2.35 a-ft available storage - 0.9 a-ft "dead" storage = 1.45 a-ft available. <br />Given the conservative assumptions used, the pond is still adequately <br />sized. <br />Ia regard to the sedimentation ponds at the explosive storage area and the <br />sanitary landfill, these ponds will be pumped after each precipitation event in <br />order to maintain an adequate storage capacity for a 10 year, 24 hour event. <br />• <br />_ .,. ., + <br />.. ._...._...w.t'r.'~sg` a ., ti <br />