Discharge Characteristics of Weirs of Finite Crest Length

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 coefficien...

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Bibliographic Details
Published inJournal of hydraulic engineering (New York, N.Y.) Vol. 135; no. 12; pp. 1081 - 1085
Main Authors Azimi, Amir Hossein, Rajaratnam, N
Format Journal Article
LanguageEnglish
Published Reston, VA American Society of Civil Engineers 01.12.2009
Subjects
Applied sciences
Buildings. Public works
Computation methods. Tables. Charts
Exact sciences and technology
Hydraulic constructions
Structural analysis. Stresses
TECHNICAL NOTES
Crest
Discharge coefficient
Hydraulics
Weirs
Open channel flow
Flow measurement
Wave crest
Theoretical study
Water flow
Experimental study
Weir
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Summary: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 Cd , 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 Cd 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 Cd .
ISSN:0733-9429
1943-7900
DOI:10.1061/(ASCE)HY.1943-7900.0000117