A channel is said lo be of most economical cross section, for a given cross-sectional area and bed slope when it __________________?
Correct answer: D. All of these
- A. Gives max. Discharge
- B. Has minimum wetted perimeter
- C. Involves lesser excavation
- D. All of these
Explanation
With fixed area and bed slope, the most economical section has the minimum wetted perimeter, which maximizes hydraulic radius and discharge. It also reduces excavation for the required conveyance, so all listed effects apply.
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