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H Flume Accuracy

In Discharge Measurement Structures, Bos presents the unified flow equation for H flumes as accurate to within +/- 3%.  

Other sources provide precision ranges from +/-2-5%.

H Flume Discharge Equations

The unique shape of the H flume – more weir than flume – has meant that the discharge equation for the flume is, in fact, not one equation but three equations:  one for low flows, one for traditional flows, and one for main flows.

Bos et al simplified these equations into one standard relationship:

H Flume Flow Tables 

Free-flow discharge tables for HS / H / HL flumes can be found in the Discharge Tables section.