To keep the Hydraulic structure safe against undermining the ________________ should be safe?
Correct answer: B. Exit gradient
- A. Hydraulic gradient
- B. Exit gradient
- C. Creep length
- D. Critical exit gradient
Explanation
Undermining begins when seepage emerges with excessive upward force, so the exit gradient must remain within a safe limit. The critical exit gradient is the limiting value used for comparison, not the routine condition to be maintained.
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