Discharge Characteristics of Weirs of Finite Crest Length
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 12
Abstract
This technical note presents a critical analysis flow over weirs of finite crest length, with square-edged or rounded entrance, for free-flow conditions. Using the flow equation for the broad-crested weir with parallel flow in the critical state as the basis, we have defined the discharge coefficient , with the head on the weir as the length scale. Based on an extensive analysis of the experimental observations in the literature, we have confirmed the classification of finite crest length weirs into four classes of long-crested, broad-crested, short-crested, and sharp-crested weirs. For the square-edged entrance, we have developed robust correlations for when the Weber number is greater than 1. For weirs with a rounded entrance, for which the data set is not that extensive compared to the square-edged case, we have developed good correlations for .
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 12 • December 2009
Pages: 1081 - 1085
Copyright
© 2009 ASCE.
History
Received: Nov 19, 2007
Accepted: Jun 16, 2009
Published online: Jun 18, 2009
Published in print: Dec 2009
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