Causes of failure of Weirs & their Remedies
1. Piping
Remedies:
- Decrease Hydraulic gradient i.e. increase path of percolation by providing sufficient length of impervious floor
- Providing curtains or piles at both upstream and downstream
2. Rupture of floor due to uplift:
Remedies:
- Providing impervious floor of sufficient length of appropriate thickness.
- Pile at upstream to reduce uplift pressure downstream
3. Rupture of floor due to suction caused by standing waves
Hydraulic jump formed at the downstream of waterRemedies:
- Additional thickness
- Floor thickness in one concrete mass
4. Scour on the upstream and downstream of the weir
Occurs du to contraction of natural water way.Remedies:
- Piles at greater depth than scour level
- Launching aprons
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