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~\ Carroll & Lange <br />PROJECT St. Vrain Lakes <br />Subj@Ct Riser Pipe -Sedimentation Pond 2 <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 = 4835 ft - 4833.1 ft = 1.90 ft <br />Area Required per Row of Holes, A =WQCV/K,a <br />K,o = 0.013(Dwq)Z + 0.22(Dwq) - 0.10 <br />Kao = 0.36493 <br />WQCV = 1.25 ac-ft <br />A = 3.425314 sq-inch <br />Determine Hole Size and Number of Holes per Row (Figure 5-2) <br />Try : 3 Columns of 1 1/4" Holes with 8"Riser Pipe <br />(1.250 sq-inch/hole)(3 hole= 3.75 sq-inch <br />Determine Number of Rows <br />Number of Rows =Dwq / (Minimum Row Spacing (4 inches) + Dia. Hole) <br />Number of Rows = 4.34286 Use 4 Rows <br />Use 4 Rows of 3 x 1 1/4" Holes with 8" Riser Pipe <br />165 South Union Blvtl., Suite 156 <br />\/ Lakewood, Colorado 80228 <br />303/980-0200 <br />Fax: 303/980-0917 <br />Sediment Basin.xls <br />