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Limitation to Standard Parshall Flume Calibrations

by Steven J. Wright, Univ of Michigan, Ann Arbor, United States,
Bahram Taheri, Univ of Michigan, Ann Arbor, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Parshall flumes are widely used for metering open channel flows. An inspection of the original study which developed the rating equations indicates that the flumes were not tested for as low of flows as currently recommended for their use. An experimental investigation indicates that the rating equations significantly over-predict discharge at low flow rates. The discrepancy can be as much as 25 percent for the range flows recommended for the flume studied. This can be apparently be attributed to viscous effects from findings on two geometrically similar flumes.

Subject Headings: Flumes | Fluid flow | Open channel flow | Ratings | Low flow | Flow measurement | Calibration

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