Irrigation Engineering
Generally the weir is aligned at right angles to the direction of the main river current because

It gives better discharging capacity
It is economical
It ensures less length of the weir
All of these

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

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

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Irrigation Engineering
Lacy's regime condition is obtained if

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

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