Impact of the Weir Slit Location, the Flow Intensity and the Bed Sand on the Scouring Area and Depth at the Dam Upstream

A total of 48 experiments were conducted to investigate the impact slit weir dimensions and locations on maximum scour depth area created upstream. The model was a 110 mm opening, it installed at end working section in laboratory flume. flume 10.0 m long, 30 cm wide, deep, almost middle. It includes 2 with mobile bed thickness. In bed, two types nonuniform sand (with geometric standard deviation 1.58 1.6) tested separately. location changed flow rates. Then from 60 x 70 (width height), while center its side. Finally, rates 2.6 8 l/s. value recorded 72 32357 mm2 when height, rate, D50 movable mm, l/s, 0.3 respectively.