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SEDCAD 4.0 <br />c,...,T..~.~ woa o~,.,oi~ i c~m.,~n <br />Refuse Pile Upper Diversion Ditch "A" <br />Material: Riprap <br />Trapezoidal Channel <br />Bottom Left Right Freeboard -Freeboard Freetxrard <br />O Sideslope Sideslope -Slope (%) <br />Width ft - Mult. x <br />Ratio Ratio Deptli (ft) %of Depth (~rxD) <br />3.00 1.5:1 1.5:1 2.0 0.30 <br />Simons/OSM Method -Mild Slope Design <br /> w/o Freeboard w/ Freeboard <br />Design Discharge: 3.50 cfs <br />Depth: 0.38 ft 0.68 ft <br />Top Width: • 4.14 ft 5.04 ft <br />Veioclty: 2.57 fps <br />X-Section Area: 1.36 sq ft <br />Hydraulic Radius: 0.311 <br />Froude Number: 0.79 <br />Manning's n: 0.0377 <br />Dmin: 2.00 in <br />D50: 9.00 in <br />Dmax: 12.00 In <br />Upper Diversion Ditch "A' at the Munger Canyon Mine refuse pile was not constructed in <br />accordance with the design presented in Volume III, Appendices, Appendix M(vii). Ditch <br />"A' is a temporary ditch so it may diverge from the permanent ditch design as long as <br />there is a capacity adequate for design flow plus required freeboard. The above <br />calculation shows the minimum standards for Ditch "A" to handle the design flow. The <br />minimum standards for the trapezoidal channel are a bottom width of 3.0 feet, 1.5H:1V <br />side slopes, with a channel slope of 2°/u and 0.68 ~eet deep including 0.3 feet freeboard. <br />I hereby certify that Ditch "A' meets the miryrt~gt~~ds shown above and Ditch "A" <br />does have adequate capacity for the de~rp4V'~ ••~..1~~ <br />of do No. 1 <br />F °~ <br />a.Sn_°Oec s°e~ <br />SEDCAD Utility Run Printed 10-21-2005 <br />