Laserfiche WebLink
• <br />December 23, 2009 <br />• <br />Peak Flow (Type IfStorm- Moderate) <br />(Wilkes and King;: 1975 Figure D-42) <br />NRCS- RunoffCurve Number80 <br />DrainageArea 40000 ft2 0.92. 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 />Rainfall low' May <br />Rainfall high August <br />Disturbed <br />Return. Period Rainfall Duration Rainfall Amount Runoff DrainageArea. CFS/inch Peak flow Area Total <br />(acres) Runoff (cfs) Volume <br />(Cubic Feet) <br />2 24 1.25 0.17 1.15 0:0 567 <br />10 24. 2S 0.89 1.15 0.0 2967 <br />25 24 3.5 1.64 1.15 0.0 5467 <br />100 24 .3.78 1.90 1.15 0.0 6333 <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 />Rainfall high August. <br />Reference <br />Table U-4 <br />Above May Day Portal and Bench <br />Mayday Mill and Mine Site <br />Wildcat Mining Company <br />Mayday Mine /Pond Sizing <br />Durango, Colorado <br />US. 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 from m1to.100years. Washington, D.C. <br />Wilkes,:5: Glade and Erke C..King,,1975, ProceduresforDeterrnining Peak FIowS 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 />Culvert Master <br />Page 1 <br />• <br />CMP -Ditch Calculations.xlsx <br />