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Irrigation demand

Irrigation demand of a region depends upon the areas irrigated with surface water and ground water, different crop water requirements and irrigation application efficiency. Irrigation demand may be worked out as given in Table 5.

Table 5. Irrigation with surface and ground water

Surface irrigation area

Ground water irrigation area

Irrigation

demands

Crop water requirements

+

Surface irrigation efficiency

Ground water irrigation efficiency

The irrigation demand ranges from 193 m3 per person in Brahamputra basin to 1,617 m3 per person in Indus basin. Irrigation efficiencies range from a low of 31% whereas most of the area is surface irrigated to a high of 62% (where most of the area is irrigated from ground water). Irrigation is the largest sector of water demand and irrigated agriculture shall further be called upon to produce a sizable portion of the food grains requirements for the growing population. Considering the rapid changes in the dietary habits and standard of living of the Indian population, it may be difficult to make correct estimates for future food grain requirements have been given in Table 6.

Table 6. Future food grains and water demands for irrigation under different scenarios

Year

Low

demand

scenario

(Mt)

Water

requirement

(BCM)

Medium

demand

scenario

(Mt)

Water

requirement

(BCM)

High

demand

scenario

(Mt)

Water

demand

(BCM)

2010

249

489

265

536

271

556

2025

322

619

349

686

365

734

2050

469

830

539

1,008

605

1,191

 
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