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Vertical sluice gates are widely used for flow control in irrigation and drainage channels. They may be used in pris-matic or in non-prismatic channels. Steps may be constructed in stilling basins based on land topography and de-sign requirements for the purpose of increasing the energy dissipation and reducing the length of hydraulic jump. The objective of the present study is to investigate the effect of a positive step located in radial stilling basin on the discharge of a free flow gate conditions. A diverging channel reach with fixed length and constant divergence angle is used. The effects of different relative height and relative positions of positive step on the coefficient of discharge below the gate are investigated experimentally. Also an experimental investigation was conducted to evaluate the effect of using sloping steps instead of the vertical steps on the discharge coefficient of the gate. 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 positive step down stream the gate in a radial stilling basin increases the discharge coefficient and the percentage of increase increases with the sloping step. It is found also that the percentage of increase in the discharge coefficient reduces with the increase in step relative position. 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.

STUDY OF FREE FLOW BELOW VERTICAL SLUICE GATE WITH POSITIVE STEP IN RADIAL STILLING BASIN