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Settling
One requirement for a Cutthroat Flume to be accurate is that the converging floor is set level from front-to-back and from side-to-side. However, because of the material weight, the unreinforced nature of natural channels, long-term consolidation of the foundation soils, and general installation errors, the flume may be installed off level or may experience settlement over time. When this happens, the standard flow equations will no longer accurately indicate the flume's true flow rate.
Investigations by Colorado State University have resulted in a generalized correction for Cutthroat Flumes that have experienced settling.
The true or measured discharge (Qm) may be determined by:
Where (with level measurements taken on the LEFT side of the flume looking downstream):
A negative lateral (crest) slope is when the RIGHT side, looking downstream, is lower than the flume-floor centerline. A positive lateral slope is where the LEFT side is lower than the flume-floor centerline.
A negative longitudinal slope is where the flume entrance is LOWER than the exit of the flume. A positive longitudinal slope is where the flume entrance is HIGHER than the exit of the flume.
These corrections were determined to be applicable for:
- Cutthroat Flumes from 18" L x 8" W to 108" L x 24" W in size (although researches state their belief that the procedure should apply to a wide range of Rectangular Cutthroat Flumes)
- Lateral slopes of -6% to 4%
- Longitudinal slopes of -6% to 4%
Sources: Revising the Cutthroat Flume Settlement Rating Adjustment Procedure, Rating Adjustment for Settlement of Cutthroat Flumes
LOCATIONS IN ATLANTA, GA & BOISE, ID