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JD -6 Mine — Drainage Design Plan 30 <br />N -D OUT 2 <br />tvtDS <br />N-� QUT 3 <br />EXPLANATION <br />N-A Sub -Basin <br />Reach Natural el <br />Formed ChannChannel <br />QUT 1 Cutlet <br />NHR Reach, Borrow Ditch <br />Within Sub -Basin <br />SWRP Pond <br />UDS Reach Diversion Ditch <br />Figure 14. Schematic of Stormwater Routing at the JD -6 Mine <br />Table 16. Sub -Basin Areas, Receiving Reach, Weighted Average Curve Number, and Time <br />of Concentration in TR -55 Model <br />Name <br />Description <br />Reach <br />Area(ac) <br />RCN <br />Tc <br />------------------------------------------------------------------------------ <br />N-A <br />Main drainage above UDS <br />UDS <br />52.4 <br />73 <br />0.163 <br />N- B +C +tri <br />Triangle above west UDS <br />UDS <br />1.95 <br />73 <br />0.110 <br />N -D +tri <br />Area below UDS reporting <br />MDS <br />0.99 <br />73 <br />0.1 <br />N -E <br />Area below UDS reporting <br />LDS -E <br />1.39 <br />74 <br />0.1 <br />N -F <br />Road CL to LDS -north <br />LDS -N <br />1.90 <br />75 <br />0.1 <br />N -H <br />Road to culvert on switch <br />NJR <br />0.35 <br />76 <br />0.1 <br />N -I <br />Road to NJ via culvert <br />SWRP -In2 <br />0.68 <br />74 <br />0.1 <br />N -J <br />Road & slope above SWRP <br />SWRP -In2 <br />0.81 <br />81 <br />0.123 <br />MFA <br />Mine Facilities to SWRP <br />SWRP -Inlet <br />3.01 <br />85 <br />0.229 <br />Total area: 63.48 (ac) <br />Notes: Calculated Tc values of <0 1 hr were converted to 0 1 hr in WinTR -55. <br />4148A.131028 Whetstone Associates <br />