Vertical Adjustable Weir

摘要

Discharge measurement accuracy of a vertically adjustable Cipolletti weir having a 2-ft crest length was investigated in the laboratory. The investigation included determination of head-discharge relationship of the weir and a means of standardizing the method of relating elevation of the movable weir crest to head of water on the crest. Discharges indicated by the weir head were in general in good agreement with discharges measured by volumetrically calibrated Venturi meters for movable crest elevations greater than 0.1 ft above the stationary weir. Reliable discharge measurements could not be made for movable weir crest elevations less than about 0.1 ft above the stationary crest. (Author)