GATE 2025 Hydrology and irrigation Quiz 9

A field having culturable commandable area equal to 1046 hectares is used for growing of crops. If the intensity of irrigation of rabi and kharif crop are 56% and 48% respectively, what will be the ratio of depth of water required for rabi crop to kharif crop (up to 2 decimal place). Assume the base period for rabi and kharif crop are 64 days and 45 days respectively.

A distributary canal carrying discharge of 0.24 m³/s is used to irrigate the field of land area 464 hectares for 8 hours. If the discharge reaching the field is 0.20 m³/s only and the runoff losses in the field are 375 m³, what will be the water conveyance and water application efficiency?

In order to avoid short comings of surface irrigation, sub surface irrigation was practiced in a region. Which of the following conditions is/are considered favorable for sub surface irrigation–

(May have multiple correct answer)

What will be the sodium absorption ratio of a soil for which

[Na⁺] = 250 mg/l , [Ca²⁺] = 45 mg/l , [Mg²⁺ ] = 18 mg/l

Agricultural land is to be irrigated for a particular crop. The land was studied for water requirement need and following data were recorded,

field capacity = 17%, permanent wilting point = 8%, permissible depletion of available soil moisture = 55%, Dry unit weight of soil = 1700 kgf/cm³ and effective rainfall for the region is 27 mm.

The net irrigation requirement per meter depth of soil will be (in mm).