Irrigation Engineering
Lacy's regime condition is obtained if

Silt charge in the channel is variable
Silt grade in the channel is variable
Discharge in the channel is variable
Channel flows in unlimited, incoherent alluvium of the same character as that transported material

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Irrigation Engineering
In a syphon aqueduct

Drainage passes over the canal and F.S.L. of the canal is above the bottom of the drainage trough
Drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough
Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough
Canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough

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Irrigation Engineering
For a standing crop, the consumptive use of water is equal to the depth of water

Used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil
Transpired by the crop
Transpired and evaporated by the crop
Evaporated by the crop

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