Irrigation Engineering
The uplift pressure on the roof of an inverted syphon, is maximum when

Canal is running with F.S.L.
Drain in running dry
Canal is running dry
Drain is running with H.F.L.

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Irrigation Engineering
Lane's weighted creep theory assumes

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

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