Abstract
ABSTRACT AN accurate and inexpensive vane type flow measur-ing device was developed to measure irrigation flows under conditions of extremely low water surface gra-dients and large backwater effects. The device is based on a section of reinforced concrete pipe equipped with a specially shaped metal vane suspended from its top edge through a slot cut in the pipe. The torque created by the moving water acting on the vane is measured and related to channel discharge. Coefficients for the relationship were determined theoretically and experimentally for various pipe sizes and compared. Differences ranged from zero to 4.5 percent. The device functioned well in situations where flume submergence would approach 100 percent. The cost of the device is significantly less than that of a comparable Cutthroat flume.
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