The following statements (S1 to S4) pertain to the lining of canals.
S1: Lined canals have greater evaporation loss than unlined canals.
S2: Lining of canals provides a rough surface, and thereby increases the rugosity co-efficient.
S3 : The cross-section area of lined canal is less than that for an unlined canal, for the same discharge.
S4: Lined canals have flatter hydraulic gradient than unlined canals, for carrying the same discharge.
Which of the statements is/are INCORRECT?
1
Both S1 and S2
2
Only S4
3
Only S3
4
Both S1 and S4