To avoid scouring from end of structure, it is necessary to provide a ________________ at the exit point?
Correct answer: D. Vertical cutoff
- A. Stone blocks
- B. Stone apron
- C. Stone boom
- D. Vertical cutoff
Explanation
A vertical cutoff at the downstream exit lengthens the seepage path and reduces the exit gradient, helping prevent piping and scour. A stone apron may provide surface protection, but the specified structural measure at the exit is the cutoff.
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