Design Efficiency Studies for Stilling Basins

The Ministry of Water Resources and Irrigation (MWRI), Egypt has constructed various hydraulic structures and facilities along the Nile River to control the release of water in according to planned water demand. Barrages have been built on the Nile River to regulate the water distribution and control the water flow to maximize profitability and minimize the water losses. To maintain the efficiency of the water distribution along the river, the MWRI is replacing the old barrages in which their life time is over by new ones. During testing the New Esna and Naga Hammadi Barrages designs and their hydraulic performance on a physical model, it was observed that the scour occurred immediately downstream the stilling basin and exceeded the expected values. In both cases significant design modifications have been introduced using trial and error based on expert's opinion. Different shapes of stilling basins were tested in order to investigate the performance of stilling basins effect on submerged hydraulic jump. The proposed designs were classified into four groups and each group consisted of two or three designs.