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Chief Channel <br />Design <br />Steep <br />Gradient <br />100 yr /24 hr <br />Storm/ Inches <br />Peak Flow <br />100 <br />> (cfs) hou <br />hou <br />yr/24 r <br />Side <br />Slopes <br />Gradient <br />(ft/ft) <br />Bottom <br />Width (ft) <br />Flow <br />Depth (ft) <br />100 yr/24 <br />hr flow <br />velocity <br />Channel <br />Depth (ft) <br />Channel <br />Carrying <br />Capacity <br />(cfs) <br />Figure <br />Table Flow <br />Calculations and <br />Structure Flow <br />Calculations <br />Access Road <br />1H:1V <br />1 <br />2.5 <br />>16% I 3.78 87 3(H):1(V) 0.05 1 4 <br />1.4 <br />7.7 <br />2 <br />187 <br />1H:1V <br />May Day No 2 <br />Channel Design <br />Steep <br />Gradient <br />100 yr /24 hr <br />Storm/ Inches <br />Peak Flow <br />(cfs)1 <br />yr /24 hour <br />Side <br />Slopes <br />Gradient <br />(ft/ft) <br />Bottom <br />Width (ft) <br />Flow <br />Depth (ft) <br />100 yr/24 <br />hr flow <br />velocity <br />Channel <br />Depth (ft) <br />Channel <br />Carrying <br />Capacity <br />(cfs) <br />Figu <br />Table Flow <br />Calculations and <br />Structure Flow <br />Calculations <br />Access Road <br />1H:1V <br />1 <br />2.5 <br />>16% 3.78 98 3(H):1(V) 0.05 2 <br />1.7 <br />9.15 <br />2.5 <br />187 <br />1H:1V <br />Road Ditch <br />Design <br />Side Slopes <br />Constructed <br />Depth (feet) <br />l0yr /24hr <br />Storm <br />Inches <br />Slope <br />(ft/ft) <br />Peak Flow <br />(cfs) 10 <br />yr/24 <br />hour <br />Velocity <br />(fps) <br />l0yr/24 <br />hour <br />Flow <br />Depth <br />feet <br />(feet) <br />Access Road <br />1H:1V <br />1 <br />2.5 <br />0.1 <br />0.8 <br />1.2 <br />.0.1 <br />May Day <br />1H:1V <br />1 <br />2.5 <br />0.1 <br />3.9 <br />5.2 <br />0.85 <br />Idaho <br />1H:1V <br />1.5 <br />2.5 <br />0.05 <br />4.8 <br />4.75 <br />0.7 <br />Bench Drainage <br />Drainage <br />Area <br />(Acres) <br />10yr /24hr <br />Storm Inches <br />Run Off <br />/inches <br />Flow <br />Volume <br />(cu ft) <br />May Day <br />0.5 <br />2.5 <br />0.13 <br />0 <br />Idaho <br />0.92 <br />2.5 <br />0.13 <br />433 <br />• <br />Idaho -May Day Mine Complex <br />Drainage Control Summary <br />Wildcat Mining Corporation <br />Durango, Colorado <br />7/18/2011 <br />• <br />Page 2 <br />