Visual Estimates of Flume and Weir Operating Conditions

by Albert J. Clemmens, USDA, United States,
John A. Replogle, USDA, United States,
Yvonne Reinink, USDA, United States,

Document Type: Proceeding Paper

Part of: Planning Now for Irrigation and Drainage in the 21st Century


Laboratory studies were conducted on a rectangular broad-crested weir to determine the effects of entrance and exit conditions on the prediction of discharge and required energy loss. In doing so, a method for visually determining whether downstream conditions affect the flume calibration was developed. It was shown that the current mathematical model of these flumes did a good job of predicting both discharge and required head losses. Approach ramp slopes of 3:1 and 2:1 were shown to be acceptable for accurate discharge prediction, although it is speculated that a slight rounding of the approach ramp corners will improve predictions. At high rates of energy head to throat length and with a sudden downstream transition, the model slightly underpredicted the required energy loss. Additional study results are discussed.

Subject Headings: Energy loss | Flumes | Weirs | Laboratory tests | Water discharge | Rivers and streams | Flow measurement | Open channel flow

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