Improvement of USBR VI Stilling Basin Models for pipe outlet.

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HL Tiwari, VK Gehlot, A. Goel, S Tiwari, SM Yadav

Friday 3 july 2015

12:15 - 12:30h at South America (level 0)

Themes: (T) Sediment management and morphodynamics, (ST) Basin-wide sediment management

Parallel session: 15J. Sediment - Basin

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Experimental work pertaining to the design of new stilling basin model for pipe outlet using different appurtenances is reported in this paper. On the basis of present investigations, newly stilling basin model design has been compared with USBR VI stilling basin model. The main purpose of this research article is to design and develop new model for pipe outlet stilling basin which is more efficient and economical as compared to other existing models non circular pipe outlet by developing new physical models of stilling basin in the laboratory. The new models were tested in a rectangular shaped pipe outlet for three Froude numbers (namely Fr = 1.85, 2.85 and 3.85) in comparison to USBR VI stilling basin model recommended for the pipe outlets. The new models are developed by changing the geometry and location of splitter blocks and impact walls, while keeping the other configuration of stilling basin geometry same as suggested by USBR VI stilling basin. The scour pattern was measured for each test run and flow pattern was also observed. The performances of the basins were compared by performance index (PI) using the same sand base material and test run time for all models. After experimental investigations, it is found that, for a given Froude number range, by changing the suitable size, shape and location of splitter blocks and impact wall along with end sill, the performance of stilling basin is improved and also the length of the newly developed basin is reduced to 29% as compared to USBR VI stilling basin for a given flow conditions Keywords: End sill, Froude number, Performance index, Splitter Block, Stilling basin