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Trapezoidal Flume Accuracy

Trapezoidal flumes are rated as accurate to within +/2% by Humphreys and Bondurant and +/-2-5% by the U.S. Environmental Protection Agency.  These accuracies are in line with other types of flumes.

Trapezoidal Flume Flow Equations

The free-flow discharge equations for Trapezoidal flume have not been standardized by industry or national standards.  However, the equations for individual flumes (Q = cfs, H = feet) have been published in some scholarly articles and publications:

Trapezoidal flume free flow discharge equations in feet and CFS

Trapezoidal Flume Flow Tables 

Free-flow discharge tables for Trapezoidal flumes can be found in the Discharge Tables section.