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• Shotcrete Ditches <br />Manning Rough Coefficient (n) = 0.016 (Shotcrete) <br />= 0.03 (Earth) <br />Ditch Slopes - East = (6230 - 6150)/ 953 <br /> = 8.4% <br />North = (6150 - 6120)/ 935 <br /> = 3.2% <br />West = (6260 - 6120)/ 880 <br /> = 16% <br />South = (6232 - 6260)/ 546 <br /> = 5.1% <br />10-Year, 24Hour Type II Precipitation Runoff Quantity <br />Slope <br />East (0.81 In. Runoff) (4.7 Acres) (1.17) (1/12) Corr. Factor = 0.37 Acre-ft <br />North (0.81) (5.15) (1.17) (1/12) = 0.407 Acre-ft <br />West (0.81) (3.5) (1.17) (1/12) = 0.276 Acre-ft <br />South (0.81) (1.23) (1.12) (1/12) = 0.093 Acre-ft <br /> 1.15 Acre-flt <br />C <br /> <br />