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WEST MINE DIVERSION - EAST LIMB <br />• Ditch Sizing <br />1. Q = 10.65 cfs <br />2. Cross Section - shot June 11, 1981 <br />5'=Y1 6'=Y2 Y1 Y2 LQl(= 70.7° <br />1.75'= `\\\~ /-~ ° 73.7° <br />a /-~ Y = 1.75' <br />= 70.7° 73.7°= <br />2 Y1= 5' <br />Total area A = Y_ (tan tan <br />Q4 ) <br />2 X2= 6' <br />X1=Y tan (x <br />XZ=Y tan <br />3. A = 4 <br />• N = lV5 <br />A rough <br />fist sized gravel <br />= 16.65ft3/S = 4.16ft2 <br />.Oft/S <br />(A) 2/3 '2 __ 1.5 ( 4.Oft2 2/3 <br />(~ (S)' 4.16 /S (7.57 ft ) (O.i08) <br />= 0.08 <br />Hess of 0.08 could be accomplished by lining with vegetation or <br />which would be nonerosive at velocity of 4.0 ft/S. <br />4. Freeboard <br />1 .75' <br />1.15' <br />1.75' - 1.15' = 0.60' <br /> <br />5' 6' <br />