Irrigation Engineering
The area between the isohyets 45 cm and 55 cm is 100 square km and between 55 cm and 65 cm is 150 square km. The average depth of annua! precipitation over the above basin of 250 square km will be

55 cm
50 cm
60 cm
56 cm

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Irrigation Engineering
Lacy's regime condition is obtained if

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

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Irrigation Engineering
An artesian aquifer is the one where

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

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