Limitation to Standard Parshall Flume Calibrationsby Steven J. Wright, Univ of Michigan, Ann Arbor, United States,
Bahram Taheri, Univ of Michigan, Ann Arbor, United States,
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 | Open channel flow | Ratings | Low flow | Fluid flow | Water flow | Inspection | Flow rates
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