KITUI SAND DAMS

L j = Hydraulic Length.This length should cover the distance of the projection of the water flowing over thespill way. This can be determined using either free fall or simplified slop area methodto determine the discharge through the spillway.1 L D = 0.96 (q 1/3. Hs 1/2) (Free Fall Method).q= Q/L s2 Log Q = 0.188+1.33 loqA+0.05 log S + 0.056 (Log S) 2Typical Example.i) Kwa -Ngove.A=8.25m 2 ; S=0.01; H s= 1.5LogQ = 0.188+1.33 loq8.25+0.05 log (10 -2 ) + 0.056 (Log 10 -2 ) 2=1.531.Q=34m 3 /sq = Q/L s = 34m 3 /6.5ms=5.22m 2 /sL Bf =L D =0.96 (q 1/3 .H s 1/2 )=0.96 (5.22 1/3 * 1.5 1/2 )=2.04m.ii) Kwa- Kathata.H f =1.05m; H s =1.35m; W f =2.6m; W b =1.8m; L s =1.8m; S=0.01.A=1/2 × 1.05 × (2.6+1.8) = 2.31m 2LogQ = 0.188+1.33 loq2.31+0.05 log (0.01) + 0.056 (Log 0.01) 2= 0.840Q= 6.91m 3 /sQ = 6.91m 3 s -1 /1.8m =3.84m 2 s -1L Bf = 0.96 (3.84 1/3 × 1.35 1/2 )41