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Steps may be constructed in stilling basins based on land topography and design requirements for the purpose of increasing the energy dissipation and reducing the length of hydraulic jump. This paper aims to investigate the effect of a negative step located in radial stilling basin on the discharge of a free flow gate conditions. The effect of both step height and position downstream the gate is investigated experimentally by analyzing large series of experimental data. The data are collected using a laboratory flume of relatively large dimensions (30cm wide, 45cm depth, and 15 m long). A diverging channel reach with fixed length and constant divergence angle is used. The effects of Different relative height and relative positions of negative step on the coefficient of discharge and the relative energy loss through the gate are also investigated experimentally. The dimensional analysis was used to correlate the discharge coefficient to the other relevant flow and step parameters. It is found that the presence of negative step down stream the gate in a radial stilling basin has a remarkable negative effect on the discharge coefficient and remarkable positive one on the energy loss through the gate. Dimensionless general equations in terms of the flow and step parameters for computing the coefficient of discharge of the sluice gate is developed using the multiple regression analysis. The obtained predictions of the discharge coefficient using the developed equations are compared to the experimental data. The developed equations proved good reliability and high accuracy.

CHARACTERISTICS OF FREE FLOW BELOW SLUICE GATE BELO RADIAL STILLING BASIN WITH NEGATIVE STEP