CLASSIFICATION OF CANALS BASED ON DISCHARGE

 


1.     Main canal

The main canal takes off directly from a river or reservoir. It carries water in large amounts to feed the branch and distributaries canals.

Due to conveying of very high discharge through the main canal it is not recommended to do direct irrigation from it.

2.     Branch Canal

 The branch canal takes off from main canals at regular intervals. These canals supply water to major and minor distributor’s canals.

 The discharge of the branch canal is generally over 5 m3 /sec.

3.     Major Distributary Canal

 Major distributary canal takes off from the branch canal or in some cases from the main canal.

They supply water to minor distributaries and field channels.

 A canal is said to be major distributary when its discharge lies between 0.25 to 5 m3 /sec.

  Minor Distributary Canal

Minor distributary canal takes off from major distributaries and sometimes directly from branch canals depending upon the discharge of canals.

 Their discharge is generally below 0.25 m3 /sec.

These canals supply water to the field channels.

 Field Channels

 Field channels also known as watercourses are small channels excavated by cultivators in the irrigation field.

These channels are fed by the distributary canals and branch canals through canal outlets.

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