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n <br />f~ <br />Table TR 90-06-1 <br />SEDIMENTATION POND "M3-N" - DESIGN CALCULATIONS <br />• <br />• <br /> Ditch P-1 Ditch P-3 <br />Drainage Area 77.5 ac 29.9 ac <br />Maximum Elevation 6,780 6,790 <br />Minimum Elevation 6,670 6.670 <br />Drainage Height 110 120 <br />Hydraulic Length 5,700 2,500 <br />Equivalent Area 247.1 ac 62.6 ac <br />Watershed Shape Factor 0.31 0.48 <br />Length of Contour <br />LC-25 1,500 1,000 <br />LC-50 1,200 1,660 <br />LC-75 3,400 1,900 <br />Average Slope 5.0% 10.5% <br />(Moderate Slope) (Steep Slope) <br />Slope Adjustment Factor 1.07 0.92 <br />Ditch P-2 <br />6.3 ac <br />6,790 <br />6,670 <br />120 <br />900 <br />11.4 ac <br />0.55 <br />1 <br />700 <br />600 <br />520 <br />19.9% <br />(Steep SI ope) <br />1.02 <br />Precipitation Event <br />(10 year - 24 hour at 1.8 in) <br />CNIi 82 82 <br />(Soil Group "D" -Cultivated Land with Conservation Treatment) <br />Average Runoff 0.52 in. 0.52 in. <br />Equivalent Peak Discharge 29.64 cfs 20.80 cfs <br />(At - cfs/in runoff) 51 cfs/in 40 cfs/in <br />Actual Peak Discharge 9.8 cfs 9.2 cfs <br />Add. Spring Seep -0- 0.5 <br />Total Peak 9.8 cfs 9.7 cfs <br />Total: 23.3 cfs <br />MR 90-06 <br />Exhibit 3 - 16 <br />82 <br />0.52 in. <br />6.76 cfs <br />13 cfs/in <br />3.8 cfs <br />-0- <br />3.3 cfs <br />11/16/90 <br />