Effect of roughness height on the performance of stilling basins

This study presents the results of experiments on the effect of roughness height on the performance of hydraulic jump type stilling basins. The length of jump is taken as the main criterion for the length of the stilling basins. The experimental work is conducted on a large laboratory flume to minimize side wall effects. Non-dimensional empirical formulae are developed to compute the length of the hydraulic jump in terms of the roughness height ratio and the approaching flow Froude number. Design curves and equations are also provided for field applications.