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• The area referred to as the Water Storage Tank Area consists of a <br />rectangular graveled pad of approximately .5 acres with two water <br />storage tanks and a water treatment plant. The tanks and building <br />occupy 35$ of the area of the pad. The drainage off the pad is <br />generally away from the tanks at a maximum of 2.2$. The <br />sedimentation study was modelled using SEDCAD 3+. <br />The SEDCAD parameters used for the model are as follows: <br />Area of structures: .19 ac. <br />Area of graveled pad: .35 ac. <br />Land use factor: 7, sheet flow <br />Runoff curves: structures, 98 pad, 91 <br />Erodibility factors, K: structures, 0.0 ; gravel pad, 0.1 <br />Control practice factors: structures, 0.0, as these have steel <br />roofs ; gravel pad with some dirt showing, 0. 1, determined from <br />conversations with SEDCAD authors. <br />Event: 10 year, 24 hour event, 1.6" rainfall. <br />The SEDCAD modelling shows that the effluent from the water storage <br />tank pad contains less than the 0.5 ml/L of settleable solids. This <br />will exempt this area from any additional sediment control. <br /> <br />