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~` Carroll & Lange <br />PROJECT St. Vrain Lakes <br />Subjl?Ct Riser Pipe -Sedimentation Pond 5 <br />Job. No. 3075 <br /> <br />Date O6/O6/O6 <br /> <br />Sheet 1 of t <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 = 4845 ft - 4843 ft = 2.00 ft <br />Area Required per Row of Holes, A =WQCV/Kdo <br />Wo = 0.013(Dwq)z + 0.22(Dwq) - 0.10 <br />Kao = 0.392 <br />WQCV = 0.3 ac-ft <br />A = 0.765306 sq-inch <br />Determine Hole Size and Number of Holes per Row (Figure 5-2) <br />Try : 2 Columns of 3/4" Holes with 8" Riser Pipe <br />(0.44 sq-inch/hole)(2hole)= 0.88 sq-inch <br />Determine Number of Rows <br />Number of Rows =Dwq / (Minimum Row Spacing (4 inches) + Dia. Hole) <br />Number of Rows = 5.05263 Use 5 Rows <br />Use 5 Rows of 2 x 3/4" Holes with 8" Riser Pipe <br />t65 South Union Blvd., Suite 156 <br />/ Lakewood, Colorado 80228 <br />303/980-0200 <br />Fax: 303/980-0917 <br />Sediment Basin.xls <br />