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galvanized steel cutthroat flume measuring irrigation flowsThe Cutthroat flume was designed to measure flow to an accuracy of +/-3%.  As with any flume, however, properly installed, total site accuracy is usualy +/-10%.

Note that this accuracy is to be expected only when the ratio of flow depth (at the point of measurement) to flume length is between 0.1 and 0.4 (0.1 < H/L 0.4).  

Above 0.4 and higher approach velocities and rapid changes in the water surface introduce inaccuracies.

As a result, extended sidewalls should only be used on Cutthroat Flumes to gain additional flow capacity as a last resort.


Image:  Montana Water Commissioners Training