An Assessment of Halving the Dimensions of Stepped Spillways on Energy Dissipation in 3 States with the Ratio

Stepped spillways are used in flood control activities and designed to reduce energy dissipation and stilling basin dimensions at their downstream terminal. It’s compatibility with the roller-compacted concrete technology، gabion construction techniques and precast concrete، made this structure to be very popular. Hydraulic modeling is a form of physical modeling using a scale model to simulate the flow. The advantage of this model is its potential in complex flow simulations. In this study، using physical modeling in a flume، one model with downstream slope of 1:0. 7 (V: H) was constructed. The Spillway crest was selected from the WES standards and the spillway had 6 steps. Six models were tested and evaluated. The results showed that most of the energy loss occurred in the described model. The results were confirmed by using Flow3d-10 the software.