Model Study of Low Drop Grade Control Structures

by W. C. Little, (M.ASCE), Research Hydr. Engr.; Erosion and Channels Research Unit., U. S. Dept. of Agric. Sedimentation Lab., Oxford, Miss.,
J. B. Murphey, Geologist; Erosion and Channels Research Unit, U. S. Dept. of Agric. Sedimentation Lab., Oxford, Miss.,

Serial Information: Journal of the Hydraulics Division, 1982, Vol. 108, Issue 10, Pg. 1132-1146

Document Type: Journal Paper


A generalized model study was conducted on low drop, grade control structures. A low drop was defined from this study as an hydraulic drop with a difference in elevation between the upstream and downstream channel beds, H; a discharge, Q; and a corresponding critical depth, Yc, such that the relative drop height, H/Yc, is equal to or less than 1.0. Conversely a high drop is defined as one with a relative drop height, H/Yc, greater than 1.0. Tentative design criteria, in the form of dimensionless equations, are given to proportion and hydraulically design the stilling basin for low drops with energy dissipation devices. A method is given to determine the size and placement of a baffle pier or baffle plate to achieve optimum flow conditions in the downstream channel.

Subject Headings: Hydraulic design | Structural models | Structural control | Drop structures | Grade control structures | Sustainable development | Baffles (hydraulic) | River and stream beds

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