Flow Over a Vertical Sill in an Open Channel

by Walter Rand,


Serial Information: Journal of the Hydraulics Division, 1965, Vol. 91, Issue 4, Pg. 97-121


Document Type: Journal Paper

Abstract: An investigation of a particular case of flow over a vertical sill is reported. This flow consists of a definite nonuniform reach between two flow sections, the entrance section upstream of the sill at which a supercritical flow exists and the surface roller of a forced hydraulic jump begins, and the exit section downstream of the sill at which uniform subcritical flow is reached. The flow is described by five dimensionless variables, the Froude number, and four similarity criteria for flow geometry. The relationships among the variables are given by graphs based on experimental data. The boundary values and the similarity concepts for the flow have been defined. The results are applicable to the design of hydraulic jump stilling basins.

Subject Headings: Nonuniform flow | Reefs and sills | Subcritical flow | Supercritical flow | Rivers and streams | Hydraulic jump | Hydraulic design | Case studies

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