Correct option is D
Canal lining : It is process of covering or lining the earthen surfaces of a canal with stable, non-erodible lining surface such as concrete, tiles, asphalt etc.
Some of the key advantages of lining a canal are the following
To minimise the seepage losses in canal.
To increase the discharge in canal section by increasing the velocity.
To prevent erosion of bed and side due to high velocity.
To retard the growth of weeds.
To reduce maintenance of canal.
The increased velocity minimises the losses due to evaporation.
