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off to Hubbard Creek would contribute excessive <br />amounts of total settle solids. The model used a <br />• grass filter to slow the velocity of the water and <br />allow deposition of sediment. A 5-foot wide strip <br />of the existing vegetation was used as the grass <br />filter between the sediment pond outslope and the <br />creek. The following parameters were used in the <br />model. <br />Soil Type <br />Soil Classification <br />Area <br />Curve Number <br />Grass Filter <br />Absarokee-Work Loams 6 - 25$ <br />Silty Clay Loam <br />0.39 Acres <br />79 - Table 2-2c., Other <br />Agricultural Lands, Fair Cover <br />700-Feet Long <br />5-Feet wide <br />6" High X 3" Spacing <br />The model indicates that the water flowing out of <br />the grass filter has a settle solids concentration <br />of 0 ml/1. Therefore the sediment pond outslope <br />does not require the use of alternate sediment <br />control. No flow monitoring will be required from <br />this SAE. <br />Upper Hubbard Creek Topsoil Stockpile <br />~~ The Upper Hubbard Creek Topsoil Stockpile was <br />modeled using the computer program Sedcad+ Version <br />3. The modeling was performed to determine if run- <br />off to Hubbard Creek would contribute excessive <br />amounts of total settle solids. The model used a <br />grass filter to slow the velocity of the water and <br />allow deposition of sediment. A grass filter <br />exists between the topsoil stockpile and the creek:. <br />The following parameters were used in the model. <br />Soil Type Absarokee-Work Loams 6 - 25$ <br />Soil Classification Silty Clay Loam <br />Area 0.4 Acres <br />Lurve Number 79 - Table 2-2c., Other <br />Agricultural Lands, Fair Cover <br />Grass Filter 100-Feet Long <br />150-Feet Wide <br />3" High X 2" Spacing <br />The model indicates that the water flowing out of <br />the grass filter has a settle solids concentratio n <br />of 0 ml/1. Therefore the topsoil stockpile does <br />not require the use of alternate sediment control. <br />No flow monitoring will be required from this SAE. <br />• B-142 <br />