Correction for Settlement of Parshall Flume
Publication: Journal of Irrigation and Drainage Engineering
Volume 119, Issue 6
Abstract
A study was conducted in the Hydraulics Laboratory of Colorado State University to evaluate how settlement affects the accuracy of 30.5‐ and 61.0‐cm (1‐ and 2‐ft) prefabricated metal Parshall flumes. The flumes were installed and tested for lateral, longitudinal, and combined lateral‐longitudinal slopes settlements. Flume slopes varied ±7%, and were conducted for free outfall conditions. The results indicated that the Parshall flume accuracy is slope‐dependent. The flume rating was in error approximately 28% for longitudinal slopes of ±5%, and approximately 10% for lateral settlement of ±5%. Flow rates used in this study ranged from 0.01 to 0.20 m3/s for the 30.5‐cm flume and 0.03–0.28 m3/s for the 61.0‐cm flume. A procedure was presented to adjust the flow rating for lateral, longitudinal, and combined lateral‐longitudinal settlement as a function of the flume slope, flow depth, and flume throat width. The results of the 30.5‐ and 61.0‐cm flumes were compared to the results of similar tests with 2.54‐, 5.08‐, and 7.62‐cm Parshall flumes.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 119 • Issue 6 • November 1993
Pages: 1081 - 1091
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Aug 19, 1992
Published online: Nov 1, 1993
Published in print: Nov 1993
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