Abstract
Available information on boundary layer development beyond the crest of a spillway is reviewed. Self-aeration of the flow begins at a critical point where the boundary layer has thickened sufficiently to induce turbulence at the surface, and the calculation of this location is an important aspect of chute spillway design. A new formulation is derived that is believed to be applicable to non-standard profiles as well as to standard crest profiles leading to a chute of constant slope. This equation allows for surface roughness and the influence of flow acceleration.
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