Performance of Submerged Ogee Crest Head-Discharge Relationships

Document Type

Article

Journal/Book Title/Conference

Journal of Hydraulic Engineering

Volume

134

Issue

2

Publication Date

2008

First Page

263

Last Page

266

Abstract

Submergence is defined as the ratio of the tailwater to the headwater, both measured relative to the weir crest. The performance of published submerged ogee-crest head-discharge relationships was investigated in this study. Four submerged and one free-flow head-discharge relationship were evaluated relative to a submerged ogee-crest data set covering a range of tailwater elevations, discharges, and weir geometries. For submergence levels <0.70, the head-discharge relationship was relatively independent of the tailwater elevation, but at higher submergence levels, this was not the case. For submergence values <0.8, the submergence head-discharge data were best predicted using the free-flow head-discharge relationship. For submergence values >0.8, the accuracies of all but one of the head-discharge relationships were very poor. For such high submergence levels, more accurate methods are needed for predicting submerged ogee-crest head-discharge relationships.

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