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<br />SOUTH ~k4 DIVERSION DITCH <br />Peak Flosr Determination <br />Watershed area: 1,448,000 ft2 33.2 acres <br />Minimum elevation: 7,285 ft. <br />Maximum elevation: 7,435 ft. <br />Watershed Height: 150 ft. <br />C25 = 7,325 LCgs 2,140 ft. <br />C50 = 7,360 ~C50 = 1,960 ft. <br />C75 = 7,400 ~C75 = 1,400 ft. <br /> <br />Average slope: 0.14 = 14.2X <br />Slope adjustment factor: 0.98 <br />Hydraulic length: 2,680 fc <br />Curve nurDber: 70 <br />Rainfall !0-year, 24-hour event: 1.7 in <br />Runoff: 0.14 in <br />Equivalent area: 70.8 ac <br />Equivalent peak discharge: 63 cfs/in <br />Peak discharge: 28.9 cfs/in <br />(28.9 cfs/in)(0.14 in) = 4.0 cfs <br />Dicch Design <br /> <br />f,PR 7 1986 <br />MINED LA^+i, <br />RECLAMATION DIVIS10~! <br />ORIGINAL <br />GROUND <br />i FT FREEBOA RO <br />CRF/jb <br />3/20/86 <br />D = O n G.375 = 0.63 FT <br />K siiz <br />n a 0.030 <br />0 = 4.0 cfs <br />K = 2.71 <br />s = 0.02 <br />L4 B6 zis iiz ,3.3 FT/s <br />V = n r s <br />r e A/P = 0.32 FT <br />A 1.27 F7z <br />P ((.65 Iz +13.901z Ivz =3.95 FT <br />FIGURE - CROSS SECTION - SOUTH •4 DIVERSION D ITCH. <br />