Which of the following canal structures is used to remove surplus water from an irrigation channel into a natural drain ?

A. more than the infiltration capacity
B. less than the infiltration capacity
C. equal to or less than the infiltration capacity
D. equal to or more than the infiltration capacity

A. useful storage
B. dead storage
C. valley storage
D. surcharge storage

A. velocity of flow of water
B. depth of flow of water
C. discharge
D. none of the above

A. 15 minutes
B. 20 minutes
C. 30 minutes
D. 60 minutes

A. B/2
B. B/3
C. B/4
D. B/6

A. vertical drop fall
B. glacis fall
C. Montague type fall
D. inglis fall