Irrigation Engineering
Retrogression of the bed level of a river downstream a weir, occurs due to

Less percentage of silt
Increase of the bed level
Heavy impact of water
Soft soil strata

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Irrigation Engineering
A divide wall is provided

Parallel to the axis of weir and downstream of it
At an inclination to the axis of weir
Parallel to the axis of weir and upstream of it
At right angle to the axis of weir

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