Abstract
This research paper investigates the effect of height of triangular intermediate sill on the performance of stilling basin models for non circular pipe outlet. The experimental study was carried out for three Froude numbers namely 3.85, 2.85 and 1.85 for non-circular pipe outlet. Performance index (PI) has been used to evaluate the performance of stilling basin models tested using same sand base material and test run time. The scour pattern was measured for each test run and flow pattern was also observed. After 24 tests runs, it was found that scour process were reduced for a particular height of triangular of intermediate sill combined with end sill of particular size and shape. Performance of this model was found to be better than USBR VI impact basin for similar flow condition.
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