Volume XVI Issue 4

Experiments are conducted by changing the size and spacing of the square shaped strip as roughness, placed on the downstream face of the ogee spillway for the purpose of energy dissipation. The percentage energy losses with and without strips are compared. The reduction in toe velocity is also studied in order to estimate the scour downstream of the spillway. The effect of critical depth on the % energy loss is also determined over the strip roughness. The study indicates that there is an energy loss for a particular relative spacing and for the given size of the strip roughness. The study suggests that the use of strip as roughness on the downstream face of the spillway would reduce the cost of stilling basin construction to a great extent.

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