Abstract
This research is an experimental investigation on the pressure distribution along the surface of Makhool Dam spillway. The work is carried out as series of tests; these series are on the model as it is designed. (17) Piezometers are fixed along the spillway surface and (4)discharges are performed on the model. The results indicated that the pressure distribution is reduced with the increase of the discharge and it is increasing with the decrease of the discharge, and there are two regions of negative pressure; the first at the ogee curve and the second at the end of the sloping straight line after ogee curve, so the slope of the horizontal surface of spillway can be reduced or change the ogee formula to prevent the cavitations' problems.
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