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 academic articles and publications:
Trapezoidal Flume Size | Flow Equation (Feet / CFS) |
Small 60º | Q = 1.55 Ha2.58 |
Large 60º | Q = 1.55 Ha2.58 |
Extra Large | Q = 1.55 Ha2.58 |
8-inch 60º | Q = 2.22 Ha1.53 + 1.467 Ha2.5 |
12-inch 45º SRCRC (No. 1) | Q = 0.05 + 0.63 Ha1.5 + 3.23 Ha2.5 |
24-inch 38º SRCRC (No. 2) | Q = 0.19 + 1.67 Ha1.5 + 4.27 Ha2.5 |
2-inch 45º WSC | Q = 3.32 Ha2.18 |
Trapezoidal Flume Flow Tables
Free-flow discharge tables for Trapezoidal Flumes can be found in the Discharge Tables section.