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Cutthroat Flume Accuracy

The Cutthroat flume was developed to provide accurate flow measurement with a precision of +/-3% under free-flow conditions.

This accuracy is to be expected when the ratio of flow depth (at the point of measurement) to flume length is between 0.1 and 0.4.  Above 0.4 and higher approach velocities and rapid changes in the water surface introduce inaccuracies.

Cutthroat Flow Equations

For free-flow conditions, the level-to-flow equation for the Cutthroat flume can be expressed as:

free flow discharge equation for Rectangular Cutthroat flume

Cutthroat Flume Flow Tables 

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