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

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

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Irrigation Engineering
Lane's weighted creep theory assumes

Triple weightage to horizontal creep and one weightage to vertical creep
Double weightage to horizontal creep and one weightage to vertical creep
Triple weightage to vertical creep and one weightage to horizontal creep
Equal weightage to horizontal and vertical creeps

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