A 20 m long horizontal concrete floor under a barrage on a permeable f – McqOptions

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1.	A 20 m long horizontal concrete floor under a barrage on a permeable foundation retains a 5 m head of water and has a 5 m deep downstream end pile. The exit gradient is
A.	1 in 4
B.	1 in 5
C.	1 in 6
D.	1 in 8
Answer» C. 1 in 6

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