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This study aims to improve the hydraulic performance of pipe siphon. An inlet and different outlet cutting a used to control the flow through the pipe and to minimize losses resulting from the sudden contraction of t Experimental works were carried out using rectangular circulating flume and pipe syphon model. The pipe constant cutting angle of ( 1= 15 ) anticlockwise from the vertical axis of. The pipe outlet model had diffe angles of ( 2= 0 , 15 , 30 , 45 , and 60 ) clockwise from the vertical axis of the pipe outlet. The pipe s tested using different discharges (Q = 7.28 to 57.20 lit. /sec) and different downstream submergence ratio 0.0, 0.25, 0.50, 0.75, and 1.0). Dimensional analysis was employed to get the inter-relationships among t factors affecting the head losses through the syphon. The results of the study led to ( 1=60 ) with subme (Hd/D = 0.0 and 0.25) gives best results for losses and upstream water depth, while The outlet cutting an ( 1=30 ) with a downstream submerged ratios of (Hd/D = 0.50, 0.75, and 1.00) gives best results for los upstream water depth

HYDRAULIC PERFORMANCE OF SYPHONS UNDER CONTROLL BY INLET AND OUTLET PIPE CUTTING ANGLES