Irrigation Engineering
In a syphon aqueduct

Drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough
Drainage passes over the canal and F.S.L. of the canal is above 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
A divide wall is provided

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

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Irrigation Engineering
Effective precipitation for a crop may be defined as

Available water stored in soil within root zone of the crop
Total precipitation minus the loss due to evaporation
Total precipitation during the crop period
Total precipitation minus the loss due to infiltration

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Irrigation Engineering
An artesian aquifer is the one where

water surface under the ground is at atmospheric pressure
water is under pressure between two impervious strata
water table serves as upper surface of zone of saturation
None of these

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