Design Chart for Predicting Critical Point on Spillways

by Robert J. Keller, (M.ASCE), Hydr. Engr.; Ministry of Works and Development, Central Labs., Lower Hutt, New Zealand,
Ashok K. Rastogi, Research Engr.; Inst. for Hydromechanics, Univ. of Karlsruhe, Karlsruhe, West Germany,

Serial Information: Journal of the Hydraulics Division, 1977, Vol. 103, Issue 12, Pg. 1417-1429

Document Type: Journal Paper


A design chart is developed for predicting the distance from the spillway crest to the critical point where self-aeration commences. Synthetic data covering a wide range of possible spillway flow situations are fed into a previously developed and verified theoretical model. The results are presented in terms of generalized design variables using dimensional analysis. The resulting design chart is applicable only to the standard WES spillway shape with vertical upstream face. Generalization of the design charts to other spillway shapes must await detailed model studies of such spillways.

Subject Headings: Hydraulic design | Spillways | Aeration | Verification | Rivers and streams

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