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<br />RECTANGLE DITCH DESIGN <br /> <br />Program ...................Storm, version 6.21 <br />Solving for ...............CFS & FPS <br />Configuration .............Rectangle <br />Flow Depth (ft)...........1.OO <br />Bottom width (Ft).........2.50 <br />Slope of Diveraion........0.0010 <br />Manning's N ...............0.035 <br />CFS ... .. ....... ... ..2.27 - <br />Crosa Section Area•(SQFT).2.50 <br />Hydraulic Radiue..........0.56 <br />FPS.. .. ...............0.91 <br />Frounde Number............0.22 <br />wFC will maintain the ditches; take representative water samples from the <br />small area exemption ditch during the year and install two silt fences <br />across the discharge of the ditch to aide the settling of suspended solids <br />from the water before discharging into Calamity Draw. <br />WFC believes the small surface runoff from Area "3" that passes through <br />the silt fences will not significantly effect the large drainage area of <br />Calamity Draw. If you have further questions, please call. <br />/S~'./n~ere~Jly, (///~ <br />R Of . L~/~'„'- <br />Chief Eng eer <br />cc: WFC - Murari P. Shrestha <br />OSM - Office of Surface Mining <br />New Horizon Mine <br />F.0. Hox 628 <br />Nucla, CD 81424 <br />Tel: 303-864-2165 <br />Fax: 303-864-2168 <br />