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JD -6 Mine — Drainage Design Plan 9 <br />Riprap sizing for the SWRP spillway was conducted using the design curves in the USBR (1998) design <br />procedure to predict stable stone size. The calculated flow over the spillway (Section 5.4) was used with <br />the following USBR design curves for sizing riprap protection on embankments of various slopes, then the <br />calculated D50 was multiplied by 3.0 for an appropriate factor of safety. The resulting spillway design is <br />discussed in Section 4.5.2. <br />U*) o� <br />C) <br />Q001 <br />So'.4 <br />S�ti.20 <br />s -6o <br />sa0.02 <br />0.001 <br />ate, Unit discharge q (MA3lslm) <br />4148A.131028 Whetstone Associates <br />