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Parameter <br />Interceptor <br />Ditch <br />Spillway <br />Design Flow (cfs) <br />2.6 <br />5.9 <br />Side Slope <br />3:1 <br />2:1 <br />Bottom Width (ft) <br />0.0 <br />8.0 <br />Total Depth (ft) <br />1.0 <br />1.0 <br />Headwater Depth (ft) <br />0.5 <br />Flow depth (ft) <br />0.5 <br />0.26* <br />Velocity (ft/s) <br />3.6 <br />2.85* <br />Slope (ft/ft) <br />0.08 <br />0.06* <br />Length (ft) <br />1300 <br />10 <br />Invert Entry (relative to 10 -year storage elev) (ft) <br />0.0 <br />JD -8 Mine — Drainage Design Plan 15 <br />Table 15. Operational and Post - Mining Drainage Structure Parameters <br />*Down gradient from spillway crest <br />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 />4122A.120702 Whetstone Associates • <br />