Small Parshall Flume Rating Correction
Publication: Journal of Hydraulic Engineering
Volume 118, Issue 5
Abstract
The Parshall flume is one of the most widely used instruments for measuring water discharge in open channels. However, field observations indicate that because the flume is subjected to field and climatic conditions, it may settle over time. A study was conducted at the Hydraulics Laboratory of Colorado State University to evaluate how settlement affects the accuracy of 1, 2, and 3 in. (2.54, 5.08, and 7.62 cm) Parshall flumes. The Parshall flumes were installed into a recirculating laboratory flume and tested for lateral slope, longitudinal slope, and combined lateral-longitudinal slope settlements. Flume slopes varied ±13% and were conducted for free outfall conditions. The results indicate that Parshall flume ratings can be corrected for lateral, longitudinal, and combined lateral-longitudinal slope conditions. Correction factors are derived for small Parshall flumes for lateral and longitudinal settlement. A procedure is presented to adjust the flow rating as a function of the slope, flow depth, and throat width.
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References
1.
Abt, S. R., Thompson, K., and Staker, K. (1989). “Discharge correction for longitudinal settlement of Parshall flumes.” Trans., ASAE, 32(5), 1541–1544.
2.
Abt, S. R., and Staker, K. J. (1990). “Rating correction for lateral settlement of Parshall flumes.” J. of trig, and Drain. Engrg., ASCE, 116(6), 797–803.
3.
Parshall, R. L. (1926). “The improved Venturi flume.” Trans., ASCE, 89, 841–851.
4.
Parshall, R. L., and Rohwer, C. (1921). “The Venturi flume,” Bulletin No. 265.Agric. Experiment Station, Colorado Agric. College, Fort Collins, Colo.
5.
Wu, T. Y. (1971), “Effects of settlement on flume ratings.” Water Mgmt., Tech. Report No. 12; AET‐71–72‐TYWIV, Colorado State University, Fort Collins, Colo.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 118 • Issue 5 • May 1992
Pages: 798 - 803
Copyright
Copyright © 1992 ASCE.
History
Published online: May 1, 1992
Published in print: May 1992
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