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CALIBRATION OF LONG CRESTED WEIR
DISCHARGE COEFFICIENT

Mahonri Lee Williams
J. Mohan ReddyMay 1993
Victor HasfurtherWWRC-93-13

Technical Report

Submitted to

Wyoming Water Resources Center
University of Wyoming
Laramie, Wyoming

Submitted by
Mahonri Lee Williams
J. Mohan Reddy
Victor Hasfurther
Department of Civil & Architectural
Engineering
University of Wyoming
Laramie, Wyoming

May 1993

Contents of this publication have been reviewed only for editorial and grammatical correctness, not for technical accuracy. The material presented herein resulted from research sponsored by the Wyoming Water Resources Center, however views presented reflect neither a consensus of opinion nor the views and policies of the Wyoming Water Resources Center, or the University of Wyoming. Explicit findings and implicit interpretations of this document are the sole responsibility of the author(s).

Abstract

Long crested weirs are used in open-channel irrigation distribution systems to minimize fluctuations in the canal water surface above canal turnouts. The object of this report was to develop an equation for the long crested weir discharge coefficient so that the weirs could be used to measure canal flowrates. Sixty-seven different weir models were tested and several general discharge equations were developed which predicted the flowrate to within plus or minus five percent.

Chapter I - Introduction
Chapter II - Literature Review
Chapter III - Laboratory Apparatus and Procedures
Chapter IV - Data Analysis and Discussion of Results
Chapter V - Summary and Conclusions
References
Appendix - Laboratory Data

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