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Drainage Basin <br />Runoff <br />Summary <br />Culverts <br />Drainage <br />Area (Acres) <br />10yr /24hr <br />Storm/ <br />inches <br />Steep <br />Slope <br />Gradient <br />ft/ft <br />Peak <br />Flow (cfs) <br />10 yr /24 <br />hour <br />Culvert <br />Size <br />(Inches) <br />Velocity <br />(fps) <br />10yr/24 <br />hour <br />100 yr/24 <br />hr Storm/ <br />Inches <br />Peak <br />Flow (cfs) <br />100 yr/24 <br />hour <br />Velocity <br />(fps) <br />100/24 <br />hour <br />Figure <br />Table Flow <br />Calculations and <br />Structure Flow <br />Calculations <br />Upper Deadwood <br />Gulch above <br />Chief Portal <br />#1 <br />311 <br />2.5 <br />>16% <br />19.5 <br />18 <br />3.43 <br />3.78 <br />87 <br />5.2 <br />Upper Deadwood <br />Gulch above <br />May Day No. 2 <br />#2 <br />388 <br />2.5 <br />>16% <br />22.1 <br />24 <br />14 <br />3.78 <br />98 <br />9.9 <br />Channel Flow <br />Deadwood Gulch <br />above La Plata <br />River <br />#3 <br />400 <br />2.5 <br />>16% <br />22.8 <br />18 <br />3.4 <br />3.78 <br />101 <br />4.06 <br />Culvert Design <br />Culverts <br />Drainage <br />Area (Acres) <br />10yr/24hr <br />Storm Inches <br />Slope <br />(ft/ft) <br />Peak <br />Flow (cfs) <br />10 yr /24 <br />hour <br />Culvert <br />Size <br />(Inches) <br />Velocity <br />(fps) <br />10yr/24 <br />hour <br />100 yr/24 <br />hr Storm <br />Peak <br />Flow (cfs) <br />100 yr/24 <br />hour <br />Velocity <br />(fps) <br />100/24 <br />hour <br />Figure <br />Table Flow <br />Calculations and <br />Structure Flow <br />Calculations <br />Access Road #1 <br />#1 <br />3.5 <br />2.5 <br />0.03 <br />0.8 <br />18 <br />3.43 <br />3.78 <br />3.8 <br />5.2 <br />Above No. 2 <br />Portal <br />#2 <br />388 <br />2.5 <br />0.1 <br />35.1 <br />24 <br />14 <br />3.78 <br />156 <br />9.9 <br />Channel Flow <br />May Day No. 1 <br />Portal <br />#3 <br />2.4 <br />2.5 <br />0.03 <br />0.3 <br />18 <br />3.4 <br />3.78 <br />1.5 <br />4.06 <br />• <br />• <br />Table U -1 <br />Idaho -May Day Mine Complex <br />Drainage Control Summary <br />Wildcat Mining Corporation <br />Durango, Colorado <br />7/19/2011 <br />• <br />Page 1 <br />