Venturi Flume vs Weir | Difference between Venturi Flume and Weir
This page compares Venturi Flume vs Weir and mentions difference between Venturi Flume and Weir.
Venturi Flume
• It is critical flow open flume with constricted flow.
This causes drop in hydraulic grade line which creates critical depth.
• Venturi flume is used for very large flow rate measurements, usually
in units of millions of cube.
• Venturi Flume measures in meters unlike venturi meter which
measures in millimeters.
• Measurement of discharge with venturi flume requires two measurements viz.
one at upstream and the other at throat (i.e. at narrowest cross-section).
Weir
• It is a barrier across flowing fluid which is designed to alter flow
characteristics.
• It is used to prevent flooding, to measure discharge and
to render river navigable.
• It takes forms of obstructions which are smaller compare to
conventional dams.
• Geometry of top of weir as well as
water flows over it are known. Hence depth of water behind weir can be
converted into rate of the flow.
• Discharge can be summarized as follows.
Q = C*L*Hn
• Weir crest should be free of rust or impurities to have
accurate flow measurement.
• Types of weirs include Labyrinth weir, Broad crested weir, Sharp crested weir,
Compound weir and V-Notch Weir.
Following table summarizes core difference between Venturi Flume and Weir.
| Features | Venturi Flume | Weir |
|---|---|---|
| Hydraulic Head Loss | Less | More |
| Dead Zone | Does not exist (where debris/sediment accumulate) | Exists (upstream of the weirs) |
| potential energy difference | Does not exist | Exist |
| Suitability for unclean waste water | It can be used. | It can not be used. |
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