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,- ,~ K <br />~'~~ <br />PEAR FLOW DETERMINATIONS TEMPORARY DIVERSIONS A-2 AND A-3 <br />Temporarv Diversion Ditch A-2 <br />Watershed Atea 82.77 AC <br />Watershed Height 375 FT <br />Length of Contour <br />LC25 (6950) 2601 FT <br />LC50 (7050) 1451 FT <br />LC75 (7125) 975 FT <br />Average Slope 13.1Y, <br />Slope Adjustment Factor 0.94 <br /> Curve Number: Subarea Area (AC) Runoff (IN) Volume (AC-FT) <br /> Undisturbed (47) 8.09 0.00 0.00 <br /> Active Mining (87) 60.75 0.68 3.44 <br /> 2+ years Growth (67) 13.93 0.09 0.11 <br /> Total 82.77 0.51 3.55 <br /> Average Curve Number 83 <br /> Rainfall 2-Year, 24-Hour Event 1.1 IN <br /> Hydraulic Length 1 69 559] FT <br /> Equivalent Area (1/209) 241.91 AC <br /> Equivalent Peak Discharge 200 CFS/IN <br /> Runoff 0.17 IN <br /> Peak Discharge 10.94 CFS <br />• <br /> Temporary Diversion Ditch A-3 <br /> Watershed Area 285.68 AC <br /> Watershed Height 1050 FT <br /> Length of Contour <br /> LC25 (6850) 666 FT <br /> LC50 (7125) 2010 FT <br /> LC75 (7375) 3510 FT <br /> Average Slope 13.0% <br /> Slope Adjustment Factor 0.94 <br /> Runoff for <br /> 1.7" Rain <br /> Curve Number: Subarea CN Area (AC) (IN) Volume CAC-FT) <br /> Undisturbed 47 149.77 0.00 0.00 <br /> Active Mining 87 95.46 0.68 5.09 <br /> 2+ years Growth 67 40.45 0.09 0.30 <br /> Total 75 285.68 0.23 5.39 <br /> Rainfall 2-Year, 24-Hour Event 1.1 IN <br /> Runoff 2-Year, 24-Hour Event 0.05 IN <br /> Hydraulic Length 11,640 FT <br /> Equivalent Area 823.18 AC <br /> Equivalent Peak Discharge 380 cfs/IN <br /> Peak Discharge 6.20 CFS <br /> + Ditch A-2 Flow 10.94 CFS <br /> Total Peak Flow 17.14 CFS <br />• <br /> LWH/jb 8/86 <br />Revised 8/86 <br />