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In conjunction with ibis activiq~. CYCC constructed a diversion ditch above the extension to route undisturbed <br />drainage around the site. The calculations for [he ditch are as follows: <br />• TRACK [?XTENSION DIVERSION DITCH <br />Drainage Area (acres) <br />Max. L-lev <br />Min. L'lev <br />Drainage Height <br />Hydraulic Length <br />Equiv. Area <br />Watershed Shade Factor <br />LENGTH OF CONTOUR <br />LC-25 (7060) <br />LC-50(7170) <br />LC-75 (7280) <br />Avg. Slope <br />Slope Ad.j. Factor <br />PRECIP EVENT !0-YEAR - 24 HOUR <br />Curve Number <br />Avg. Runoff <br />Equiv. Peak Discharge <br />CFS/IN Runoff ' <br />ACTUAL PEAK DISCHARGE fCFS <br />• "V" Ditch <br />Width (ft) <br />Depth (fQ <br />Flow Depth (ft) <br />Freeboard (ft) <br />Sideslopes(ft:ft) <br />Ditch Slope (%) <br />Velocity (fps) <br />DITCH CALCULATIONS <br />Peak Flow = 4.4 cfs <br />Use "V" Ditch <br />Z = I:l Sideslopes <br />S= I%Slope <br />N = 0.035 <br />Q = A V - 1.49 R2/3 S'~ A <br />n <br />Q = AV = 149 Zd 2/3 S)~~ ('Ld)= <br />0.035 ~ Z'+l <br />4.4 = 4257 d (0.01)' (d=) <br />2.8 <br />1.03d = d 213 d= <br />2.8 <br />11.0 <br />7400 <br />6950 <br />450 <br />1220 <br />18.9 <br />0.582 <br />630 <br />410 <br />90 <br />26.5 <br />1.07 <br />I.8 INCHES <br />74 <br />0.26 <br />7.5 <br />27 <br />4.4 <br />3.0 <br />3.0 <br />l .3 <br />1.7 <br />l:l <br />I.0 <br />2.6 <br />MR97-151 2.05-36 12~•.~<.,~i iiii°ai~ <br />