EXPERIMENTAL DETERMINATION OF THE EFFECT OF NOTCH SHAPE ON WEIR FLOW CHARACTERISTICS USING CONSTANT HEAD DISCHARGE APPARATUS

This paper reports the hydraulic experiment performed on “constant head discharge apparatus” to determine the effect of notch shape on weir flow characteristics. In the recent time, flood control has been a major concern, thus, it is necessary to design a bulkhead with the notch shape that will aid fast flow of water downstream. Weirs of two types (V-notch and rectangular) were used for the experiment. A water collecting tank was constructed and calibrated at the upstream so as to determine the head, H of water flowing over the weir. There was a slot in which a flat plate is inserted to demarcate the upstream from the downstream. It was discovered experimentally that shape and water height over the weir has effect on coefficient of discharge and volume discharged. The coefficient of discharge obtained is: 0.62 for v-notch and 1.69 for rectangular weir. Thus, rectangular weir has higher discharge than the triangular weir.