Irrigation Engineering Diversion Head Works | Civil Engineering

The works, which are constructed at the head of the canal, in order to divest the river water into the

canal are known as diversion head works.

* If the major part or entire ponding of water is achieved by a raised crest, the barrier is known as a

weir. On the other hand, if most of ponding is by gates, then the barrier is known as a barrage.

* Type of weir are:

1. Masonry weirs with vertical drop

2. Rock-fill weirs with sloping aprons

3. Concrete weirs with sloping glacis

* A structure which enables the fish to pass upstream of weir is known as fish ladder.

* A canal head regulator is provided at the head of the off-taking canal, which serves the following

functions:

1. It regulates the supply of water entering the canal.

2. It controls the entry of silt in the canal

3. It prevents the river floods from entering the cana