Experimental Study of Flip Bucket Effect at the End of Ogee Spillway on Energy Dissipation and Jet Length

In this study, the effect of flip bucket at the end of ogee spillway on the energy dissipation rate and jet length has been investigated experimentally. Experiments on standard ogee spillway for buckets with take off angles of 32 and 52 and for no bucket condition were conducted. The rate of energy dissipation in this type of spillway was investigated with conducting 21 tests with discharge range between 330 to 864 L min-1 .The results showed that at the spillway with flip buckets and take off angles of 32 and 52 , the rate of energy dissipation was increased from 10 to 20 percent compared to the spillway having no bucket. The highest energy dissipation was occurred in the flip bucket with take off angle of 52 . Also the relative energy dissipation was decreased in all three modes with increasing discharge. The length of jet for flip buckets with angles of 32 and 52 was measured and it was releaved that the length of jet for bucket of 32 was greater than that for bucket of 52 . By increasing the discharge, the difference between the jet lengths of the two buckets was decreased and at the discharge rate of 864 L min-1, the length of jet was equal for the two buckets.