Preventing Stilling Basin Abrasion

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by R. A. Dodge, Bureau of Reclamation, Denver, United States,
B. W. Mefford, Bureau of Reclamation, Denver, United States,
D. H. Merritt, Bureau of Reclamation, Denver, United States,
P. F. Lagasse, Bureau of Reclamation, Denver, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: A 1:10 scale physical hydraulic model of Taylor Draw Dam outlet works was used to develop modifications to prevent back flow intake of rock into the stilling basin. Much of the back flow was caused by poor flow conditions entering the basin. Poor flow conditions were caused by a bifurcating wye branch located a short distance upstream of the outlet control gate. These approach conditions caused the flow on the stilling basin chute to be skewed to one side and lift off the floor. To correct the problem, a slightly curved flow deflector was mounted in the chute to spread the jet laterally and force it down along the chute floor. A second flat flow deflector was mounted near the end of the basin to force flow down onto the end sill, thus causing a continuous downstream velocity over the sill.

Subject Headings: Stilling basins | Erosion | Water flow | Hydraulic models | Displacement (mechanics) | Water intakes | Stream channels | Hydrologic models | Rivers and streams | North America | Colorado | United States

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