Definition Of Weir
A weir is a raised concrete crest wall constructed across the river to raise the water level in the river and divert the water into the canal.
Advantages of Weir
1. The bed level of the canal may be higher than the existing water level of the river. In such cases, the weir is constructed across the river to raise the water level.
2. Adjustable shutters are provided on the crest to raise the water level to some required height.
3. The initial cost of the weir is low
Disadvantages of Weir
1. Low control on flow.
2. No provision for transport communication across the river.
3. Chance of silting on the upstream is more.