Aquaculture Engineering

Design of Canals - Determination of erodible channel section dimensions

Unit 11 - Water distribution and control structures

Design of Canals
Determination of non-erodible and erodible channel section dimensions

Determination of erodible channel section dimensions

Dimensions of the section for erodible channel or unlined channel such as earth canal, can be easily computed by the method of permissible velocity. The maximum permissible velocity or the non-erodible velocity is the greatest mean velocity that will not cause erosion of the channel body. An old and well seasoned channel will stand much higher velocities than new ones. When other conditions are same, a deeper channel will convey water at a higher mean velocity without erosion than a shallower one.