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Table TR-91-31-1 <br />.. SEDIMENTATION POND "F" - DESIGN CALCULATIONS <br />(EXPANSION TO RETAIN FLOW FROM SPOIL SPRING) <br /> Drainage Area (feet2) 1,960,200 <br /> (acres) 45.0 <br /> Maximum Elevation (feet) 6,900 <br /> Minimum Elevation (feet) 6,825 <br /> Drainage Height (feet) 75 <br /> Hydraulic Length (feet) 1,800 <br /> Equivalent Area (acres) 36.5 <br /> Watershed Shape Factor 1.23 <br /> Length of Contour (feet) <br /> LC-25 @ 6845 elev. 2,700 <br /> LC-50 @ 6860 elev. 1,400 <br /> LC-75 @ 6880 elev. 1,050 <br />`• <br /> Average Slope (%) 4.9 <br /> Slope Adjustment Factor (Moderate Slope) 1.06 <br /> Precipitation (inches) <br /> 10 year - 24 hour 1.8 <br /> 25 year - 24 hour 2.1 <br /> Weighted Average Runoff (inches) <br /> Sub Area Acres CN C USLE 10/24 25/24 <br /> Vegetated Surface 27.0 81 0.15 0.48 0.67 <br /> 60% poor soil <br /> cover, WC <br /> Dirt Roads 16.5 87 1.00 0.75 0.99 <br /> Paved Lot 1.5 98 -O- 1.58 1.87 <br />. total as.o <br /> Weighted Average 84 0.46 0.62 0.83 <br /> Ex. 29-4 <br />