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HYDRAULIC CALCULATIONS <br />Ski aLL DITCH <br />CONSTRUCT AS RECTANGLE WITH MINIMUM B = 3' <br />Q10 = 4 cfs <br />1% SLOPE n = .04 <br />I\FLOIV/FOOT TOO SNIALL TO JUSTIFY SPATIALLY VARIED ANALYSIS <br />Q = 1.486 AR 2/3 Sl/2 <br />n <br />4 1 .04 AR 2/3 (.01)1/2 AR2/3 = 1.08 <br />A=3y R=3+2 <br />Y <br />y = .62' V = 2.15' <br />USE 3' x 1.5' CHANNEL <br />CAPACITY = 14 cfs 100 YR RECURRANCE <br />FOR STEEP SLOPES AND JUMPS <br />S:S 1:1 S = 20% Vn = 5.6 fps No sloe protection required <br />• Jump Fl = 2.2 <br />yl = .22 <br />y2 = 2 ( 1+8Fi - 1) _ .58 <br />L=5y2=5(.58)=2.9' <br />LARGE DITCH <br />Q10 Upstream = 289 ets <br />Q10 Lateral = 21 cfs <br />Design for Q = 310 cfs as worst case S = 1% n = .04 B = 8 Z = 2 <br />b8/3S1/2 = .484 b = .42 y = 3.4' V = 6.2 fps <br />USE 4.5' Depth <br />CAPACITY 554 cfs V = 7.2 <br />BETSVEEN 25 do 100 YEAR EVENTS <br />STEEP 16% <br />• yn=1.641 Vn=l7 fps F=2.66 E=6.00 <br />~ y2 = 5.91 >yn Down <br />