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 transitional flows, and one for main flows.
Bos et al simplified these equations into one standard relationship:
In the Teledyne Isco Open Channel Flow Measurement Handbook, 8th Edition, Teledyne goes further to provide simplified, single variable discharge equations for the various sizes of H flumes (not HS or HL). These equations are intended to provide flow over the full scale of the table and may vary at the low / high ends of the discharge range.
H Flume Flow Tables
Free-flow discharge tables for HS / H / HL flumes can be found in the Discharge Tables section.