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Sunday, 22 March 2015

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Water shortage looms in India

A striking fact about water in India is the lack of reliable data about all its aspects: total potential, available supply and demand

India faces serious challenges to sustain its water resources as agriculture, industry and domestic sectors compete with each other for the scarce resource. The situation is exacerbated by poor water management practices, over-extraction of surface and groundwater and pollution.


India is the largest consumer of groundwater in the world
(Source: Mohd Shefar)

Unfortunately, there is a lack of reliable data about the total potential of water resources and supply and demand of water.

Rainfall, India's primary source of freshwater, is estimated to be 4,000 billion cubic metre (BCM), but it varies widely across states, seasons and years. The Planning Commission's Steering Committee on water resources for the 11th Five Year Plan reported that India's water resources potential is 1,869 BCM, including groundwater.

This is when "utilisable" water resources have been assessed at 1,123 BCM, of which 690 BCM are from surface water and 433 BCM from groundwater. Besides, the surface water estimates have remained unchanged for several decades - the National Agricultural Commission report in 1976 and subsequent estimates by the Central Water Commission in 1988 and 2001 have mentioned this number. But Planning Commission's working group for the 12th Plan said it failed to locate any document explaining the basis for the estimate.

Availability: signs of stress

Assuming the availability of 1,869 BCM to be accurate, India will move from a water-adequate nation (per capita availability of over 1,700 cu m/year) to a water-scarce one (per capita availability of less than 1,000 cu m/year) by 2025. Nine of 20 river basins, supporting 200 million people, are facing water shortage.

Groundwater is another area of crisis. India is heavily dependent on groundwater and is the largest consumer of groundwater in the world.

The Central Groundwater Board in its 2012-13 yearbook reports that India drew 243 BCM of groundwater in 2009, which is 61 per cent of the country's net available groundwater. With no dedicated national groundwater management program, groundwater stores are being depleted at rates faster than they can be replenished.

Nationally, 27 per cent of the blocks are classified as semi-critical or worse (withdrawal in excess of 70 per cent of availability). Northwest states draw 127-170 per cent of the available groundwater.

Increased water consumption results in higher water discharge, leading to degradation in water quality. Today, industries are the main cause of water pollution.

Demand: growing pains

Let's first consider the story of evolving water needs as India transforms from a country with vast rural population dependent on agriculture to one that is relatively urban and industrialised. About 70 per cent of Indians live in rural areas. Agriculture needs account for 88 per cent of total water consumption, while industrial use and domestic water consumption by urban residents account for the balance 12 per cent of usage.

The situation in rich industrialised countries is the reverse. However, as India develops, it is unlikely to urbanise and industrialise to the same extent as the developed world. Around half of India's population is expected to remain rural by 2050 for whom agriculture will be the mainstay.

Water for irrigation will remain a significant contributor to the country's total water needs. Nevertheless, rising urbanisation will result in increased domestic water consumption: urban dwellers use far more water than rural folks on a per capita basis. Industrial water needs will also increase in line with GDP increases. India's current water policy rightly accords priority to domestic water.

Agriculture needs will also remain important to feed the growing population and support livelihoods of half the country.

- Down To Earth

 

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