When a weir is constructed, the downstream .bed of the river goes on eroding and consequently causes progressive lowering of the bed on downstream of weir called__________________?
Correct answer: B. Retrogression
- A. Lowering down of bed
- B. Retrogression
- C. Ponding on down stream
- D. All are correct
Explanation
Retrogression is the progressive lowering and erosion of the riverbed downstream of a weir or barrage. The other options merely describe the effect in general terms rather than giving its technical name.
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