KITUI SAND DAMS

Cross section area of dam is = A dAfter the dam is constructed the flood level rise to a height of H b there foreI. If A dam =A d Example 1A dam =1( Ls + Wb).Hs max2A d = W b (H b -H f )½ (Ls-W b) . Hs= W b (H o -H f )H s max = 2W b (H b -H f )/(L s -W b )WhereW b =Width of river at the bottom(Measure.)H b = Height of the lowest river bank(Measure)H f = Height of flood (Measure)L s =Length of spillway, which is initiallyassumed to equal to WW b = 4m , H f = 4m , L s = 7mA d = W b (H b -H f )= 4(5-4)= 4m 2A w =½ (W b -W f ). H f=½(4+6). 4=20m 2A d > A wThus 20 > 4Therefore4 =½(4+4). H sA dam = ½( W b + L s ). H s8=8H sH s max = 1m.When H s is set at in the site, Theactual area can be calculated.E.g. When set atL s becomes 5m.H s max , the actualA dam = ½(5+4). H s max = 42H s max = 4× =0.899Say 0.90m.II. When A d > A w, H b > H fThere fore H d max =H bH s max =H b -G fExample 2.W b = 2, W f = 4, H f = 2, H b = 637