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Flow Characteristics
Clemens, Wahl, Box, and Replogle state the RBC Flume’s accuracy as +/-2%. However, practical considerations such as approach flow, installation, and dimensional tolerances make its free-flow discharge precision closer to +/-5%.
RBC installations where the upstream / downstream / installation conditions are less than optimal or where the flume is out of dimension will exhibit accuracies less than above and may require field calibration.
RBC Flumes that have experienced settling (or been installed at a slope) do not have corrections available and must be releveled for accurate flow measurement.
The above holds for RBC Flumes experiencing free-flow. For installations where downstream conditions restrict the flow out of the flume, submergence may become a factor. As submergence corrections are not available for RBC Flumes, a submerged installation must either have the flume raised or the downstream conditions corrected.
He = feet, Hm = mm
| Flume Size | GPM | L/S |
|---|---|---|
| 50 mm | 657.9 (H +0.0025)1.853 | 0.001035 (H +0.75)1.853 |
| 75 mm | 854.7 (H +0.0043)1.853 | 0.001347 (H +1.313)1.853 |
| 100 mm | 1040 (H +0.0073)1.867 | 0.001514 (H +2.214)1.867 |
| 150 mm | 1348 (H +0.0118)1.870 | 0.001929 (H +3.603)1.870 |
| 200 mm | 1615 (H +0.0179)1.879 | 0.002189 (H +5.457)1.879 |
Free-flow discharge tables for RBC Flumes can be found in the Discharge Tables section.
LOCATIONS IN ATLANTA, GA & BOISE, ID