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• • <br />Peak Flow (Type II Storm- Moderate) <br />(Wilkes and King, 1975 Figure D - -2) <br />NRCS -Runoff Curve Number 58 <br />Drainage Area 0.5 Acres <br />Annual Rainfall 19.9 inches <br />Snowfall 68.8 inches <br />Pan Evaporation 37.8 inches <br />Average Temp High 62.7 inches <br />Average Temp Low 29.9 inches <br />Rain fall low May <br />Rain fall high August <br />Return Period Rainfall Duration Rainfall Amount <br />2 24 1.25 <br />10 24 2.7 <br />25 24 3.5 <br />100 24 3.78 <br />Annual Rainfall 19.9 inches <br />Snowfall 68.8 inches <br />Pan Evaporation 37.8 inches <br />Average Temp High 62.7 inches <br />Average Temp Low 29.9 inches <br />Rain fall low May <br />Rain fall high August <br />Reference <br />May Day Mill No. 1 Bench Runoff Control including Perimeter Ditch and Pond <br />May Day -Idaho Mine Complex <br />Wildcat Mining Company <br />Durango, Colorado <br />Runoff <br />0.00 <br />0.18 <br />0.45 <br />0.58 <br />Table U - 3 <br />U.S. Department of Commerce, 1961, Technical Paper 40- Rainfall Frequency Atlas of the United States for Durations from 30 minutes to 24 hours <br />and Return Periods fromm 1 to 100 years. Washington , D.C. <br />Wilkes, S. Glade and Erke C. King, 1975, Procedures forDetermining Peak Flows in Colorado, Incorporateds and Supplements Technical Release No. 55 <br />Uraban Hydrology for Small Water <br />Soil Conservation Service, Soil Conservation Naltion Engineering Handbook, Section 4- Hydrology NEH -4. <br />Disturbed <br />Drainage Area CFS /inch Peak flow Area Total <br />(acres) Runoff (cfs) Velocity Volume <br />(fps) (Cubic Feet) <br />0.5 3.5 0.0 0 <br />0.5 3.5 0.6 327 <br />05 35 1.6 817 <br />0.5 3.5 2.0 1053 <br />Table U -3 -Above 1 Bench -Pond .xlsx <br />