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<br />32
<br />
<br />TECHNICAL MANUAL
<br />
<br />Using the procedures outl ined on pages 5 and 6, the fo1 lowing values for
<br />the required parameters were obtained:
<br />
<br />D~ainage a~ea (A)
<br />A=9.3 mi2,
<br />
<br />Area below 7,500 ft=3.0 mi2 Plains Region
<br />Area above 7,500 ft=6,3 mi2 Mountain Region
<br />
<br />Basin slope (5B)
<br />
<br />Determine basin slope (5B) for area between site and 7,500 ft,
<br />Length of main channel (L) from site to 7,500-ft contour=3,4 mi,
<br />
<br />0.85 L=0.85(3,4 mi)=2.9 mi
<br />0.10 L=0.10(3,4 mi)=O,3 mi
<br />Elevation at 0,85 L=7,420 ft
<br />Elevation at 0.10 L=6,900 ft
<br />
<br />5B=(7,420-6,900)/(2,9-0,3)=520/2.6=200 ft/mi,
<br />
<br />St~eQlf~ed slape (55)
<br />
<br />Contour upstream from site=6,880 ft
<br />Estimated elevation at confluence=6,850 ft
<br />Distance between points='O,27 mi
<br />
<br />55=(6,880-6,850)~0.27=30~O,27=111 ft/mi,
<br />
<br />Mean annual p~eeipitation (p)
<br />P=19 inches (for that part of basin above 7,500 ft in elevation),
<br />
<br />Reduetion faeto1" (R)
<br />
<br />5ite elevation=6,850 ft,
<br />From figure II, R=0.64.
<br />
<br />This factor is app1 ied to the Plains Region discharges,
<br />
<br />Compute QIO' Q50' QIOO' and QSOO for Plains Region for area below
<br />7,500 f t.
<br />
<br />QIO = 144(A)0.528(58)0.336= 144(3)0.528(200)0.336
<br />144(1.79) (5,93)=1 ,530 ft3/s
<br />
<br />Qso = 891(A)0.482(5 )0.154= 891(3)0.482(200)0.154
<br />B = 891(1,70)(2,26)=3,420 ft3/s
<br />
<br />QIOo=l,770(A)0.463(5 )0.086=1,770(3)0.463(200)0.086
<br />B =l,770(1.66)(l,58)~4,64() ft3/s
<br />
<br />Qsoo=5,770(A)0.432=5,770(3)0.432=5,770(1.61)=9,290 ft3/s
<br />
<br />,"';'~-~,_= J _
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