This page covers advantages and disadvantages of Weir. It mentions Weir advantages or benefits and Weir disadvantages or drawbacks.
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Introduction:
• 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 are the benefits or advantages of Weir:
➨It is simple in design.
➨It requires minimum space at the
measuring point.
➨It has lower construction costs.
Following are the drawbacks or disadvantages of Weir:
➨It requires higher space upstream of measuring point.
➨It is not suitable for waste water due to risk of
deposition build up at upstream of the weir.
➨Stream separation through the ventilation should be assured for
its operation.
➨Its operation is also affected due to large floating items.
➨Roughness of any form will result into more water discharge
than indicated by standard equations or tables.
➨It affects local fauna.
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