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Carroll & Lange <br /> <br /> 165 South Union Blvd., Suite 156 <br />\ / Lakewood, Colorado 80228 <br /> 303/980-0200 <br /> Fax: 303/980-0917 <br />PROJECT St. Vrain Lakes <br /> <br />Subject Riser Pipe -Sedimentation Pond 3 <br /> <br />Job. No. 3075 <br /> <br />Date 06/06/06 <br /> <br />Sheet 1 of 1 <br /> <br />By MMU <br /> <br />Release Water Quality Capture Volume over 40 hours <br />Dwq = Stormwater Capture Water Surface Elev. -Sedimentation Volume Water Surface Elev. <br />Dwq = 4840 ft - 4838.2 ft = 1.80 ft <br />Area Required per Row of Holes, A =WQCV/K4o <br />Kao = 0.013(Dwq)Z + 0.22(Dwq) - 0.10 <br />Kao = 0.33812 <br />WQCV = 0.48 ac-ft <br />A = 1.419614 sq-inch <br />Determine Hole Size and Number of Holes per Row (Figure 5-2) <br />Try : 3 Columns of 13/16" Holes with 8" Riser Pipe <br />(0.52 sq-inch/hole)(3 hole= 1.56 sq-inch <br />Determine Number of Rows <br />Number of Rows =Dwq / (Minimum Row Spacing (4 inches) + Dia. Hole) <br />Number of Rows = 4.48785 Use 4 Rows <br />Use 4 Rows of 3 x 13/16" Holes with 8" Riser Pipe <br />Sediment Basin.zls <br />