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~\ Carroll & Lange <br /> 165 South Union Blvd., Suite 156 <br />\ , Lakewood, Colorado 80228 <br /> 303/980-0200 <br /> Fax: 303/980-0917 <br />PROJECT <br />Subject <br />St. Vrain Lakes <br />Riser Pipe -Sedimentation Pond 6 <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 Waler Surface Elev. <br />Dwq = 4843 ft - 4841 ft = 2.00 ft <br />Area Required per Row of Holes, A =WQCV/K4o <br />K4o = 0.013(Dwq)2 + 0.22(Dwq) - 0.10 <br />K4o = 0.392 <br />WQCV = 0.61 ac-ft <br />A = 1.556122 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 = 4.98649 Use 4 Rows <br />Use 5 Rows of 3 x 13/16" Holes with 8" Riser Pipe <br />Sediment Basin.xls <br />