Correct Answer - Option 3 : Manning’s formula
Explanation:
Design of lined canals:
(i) A lined canal is a rigid boundary channel. It can withstand much higher velocity as compared to an unlined, non-alluvial channel or alluvial channel.
(ii) The design is similar to the design of non-alluvial channels. However, the maximum permissible velocity is relatively high.
(iii) The design of lined canal is usually done by Manning’s formula. The value of Manning’s coefficient N depends upon the type of lining. The higher values are for relatively rough surface and the lower, for smooth surface.
