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JD-8 Mine—Drainage Design Plan 15 <br /> Table 15. Operational and Post-Mining Drainage Structure Parameters <br /> Parameter Interceptor Spillway <br /> Ditch <br /> Design Flow(cfs) 2.6 5.9 <br /> Side Slope 3:1 2:1 <br /> Bottom Width(ft) 0.0 8.0 <br /> Total Depth(ft) 1.0 1.0 <br /> Headwater Depth(ft) 0.5 <br /> Flow depth(ft) 0.5 0.26* <br /> Velocity(ft/s) 3.6 2.85* <br /> Slope(ft/ft) 0.08 0.06* <br /> Length(ft) 1300 10 <br /> Invert Entry(relative to 10-year storage elev)(ft) 0.0 <br /> *Down gradient from spillway crest <br /> 01) In consideration of the exit flow conditions, a gravel mulch lining with a D50 of 2" (see Section 2.7) has <br /> been selected for the spillway and exit chute based on Table 2.3 of HEC-15 (FWHA, 2005). <br /> 4110 <br /> 4122A.120702 Whetstone Associates <br />