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A~~ 13 -Z <br />• Cameo Refuse Disposal Area 2 Upper Diversion <br />Calculation Rational and Results Summary <br />Rational: <br />Calculated using Sedcad+ Ver. 4 <br />Areas slopes and flow paths from digital topography (CRDA-12b). <br />For the undisturbed area above CRDA 2 a CN of 83 was used to represent a D- <br />Soil Group, sage-grass with (poor) 20% cover. <br />100 year 24 hour storm event of 2.2". <br />10 year 24 hour storm event of 1.4" <br />Results: <br />East Section Results: Pages CRDA2-13 - 13e <br />Drainage Area 46.62 acres <br />Peak Flow 43.25 cfs <br />Trapezoidal Channel -Lined with riprap <br />Side Slopes Left1.5H:1 V, Right 2H:1 V <br />• 3.0' Bottom Width <br />0.7' Flow Depth <br />",~ 1.0' Freeboard <br />' 15'1 Dso Riprap <br />West Section Results: Pages CRDA2-13f - 13k <br />Drainage Area 27.68 acres <br />Peak Flow 25.68 cfs <br />Trapezoidal Channel -Lined with riprap <br />Side Slopes Left 2H:1 V, Right 1.5H:1 V <br />3.0' Bottom Width <br />0.5' Flow Depth <br />~r 1-0; Freeboard <br />__ ,~ 2~jso Riprap <br />Outlet Protection: Pages CRDA2-131 & 13m <br />The peak flow from the east and west sections was reevaluated utilizing the 10 year <br />event since the outlet protection is no longer "above" the refuse pile and therefore does <br />not need to be able to withstand the 100 year event. The energy dissipaters will be 10- <br />feet wide by 30-feet long. <br />• <br />CRDA2-12 11 /00 <br />