TODAY -

Water Is Precious : Let Us Save It

L Kanta Singh *

Loktak Lake
Loktak Lake :: Pix - Sushil Khomdram



Water is an essential part of all life on the globe. Plant and animal could not live without water. Water ensures food security, livestock security, maintain organic life, industrial production and to conserve the biodiversity and environment. Hence, there could no life without water. With the God's gifted earth is the only planet, so far we know that it posses water and this makes it fit for human living and other living organisms to exist on it.

This precious substance which are not properly utilize by mankind and increasing demand due to growing population and unsuitable lifestyle, many countries are facing sever water crisis. Year by year per capita availability of water is decreasing which threats to human life in many ways. If proper planning and corrective measures are not taken up in the proper place and proper time many developing countries including India will have to face declining in food production and water security in the near future.

India has enough potential for water resources, but due to improper management of water, destruction of many of our available natural resources which conserves the water, unsuitable lifestyle, over-exploitation of some sectors of available water which lead extreme situation in many parts of the country. At this movement we need to give immediate attention to make sustainable use of the available water resources.

Global Freshwater Scenario

Global freshwater reserves are rapidly depleting and this is expected to significantly impact any densely populated areas of the world. Low to middle income developing regions as well as highly developed countries will face water stress in the future, unless existing water reserves are managed effectively. The total volume of water on planet is 326,000,000 cubic miles. Out of the total water on the earth 97.5% is in the oceans and only 2.5% of the water on earth is freshwater. Nearly 70% of the freshwater on earth is permanently frozen in glaciers and at the polar ice caps. Less than 1% of the world's fresh water (~0.007% of all water on earth) is accessible for direct human uses. This is the water found in lakes, rivers, reservoirs and those underground sources that are shallow enough to be tapped at an affordable cost.

India's Water Budget

The basic source of water is precipitation in the form of rainfall or snowfall. India's average annual rainfall is about 119.4 cm which falls over the geographical area of 328 million-ha, which makes total amount of water to 392 million ha-m. If we include snowfall, if may be rounded off to 400 million-ha-m (M ha-m). Out of the total volume of water 300 M ha-m receives during monsoon months and rest receives during non monsoon months. Out of the total precipitation immediate loss to the evaporation is 70 M ha-m, percolation into the soil is 215 M ha-m and contribution to the surface water is 115 M ha-m.

Total annual available surface water flows in the country is 180 M ha-m. It includes about 20 M ha-m brought in by streams and rivers from catchments lying outside the country. About 45 M ha-m pertains to generate flow from ground water as assessed from river flows during non rainy months. The remaining 115 M ha-m constitutes direct contribution by precipitation of which about 10 M ha-m is received as snowfall.

Utility of surface water

Out of the total surface water of 180 M ha-m available in the country, about 15 M ha-m are stored in various forms of reservoirs and tanks and out of this 5 M ha-m are loss to evaporation and 10 M ha-m are available as utilizable water. The remaining 165 M ha-m of total surface water flow in streams and rivers and about 15 M ha-m are utilize through direct pumping and diversion works, the remaining 150 M ha-m goes to the sea and some adjoining countries.

Soil moisture and ground water recharge

About 215 M ha-m volume of water infiltrates into the soil and about 165 M ha-m volume of water retained in the soil as soil moisture which is essential for the growth of vegetation and remaining 50 M ha-m volume of water percolates to water table and adds to ground water reservoir. Some river water seeps in the adjoining area and adds to ground water. About 5 M ha-m of water are added annual to ground water through seepage from flowing rivers and 12 M ha-m of water are recharge to ground water from different irrigation systems and which makes total ground water available annually to 67 M ha-m.

Out of the total ground water available about 13 M ha-m are extracted for various uses, 45 M ha-m are regenerated to rivers and rest about 9 M ha-m loss through evapotranspiration. The soil moisture available is about 170 M ha-m which consist of 165 M ha-m from precipitation and 5 M ha-m from irrigation. Out of this total 170 M ha-m evaporation losses are 60 M ha-m and evapotranspiration losses are 110 M ha-m. Again out of total evapotranispiration losses from forest and other vegetation constitute 55 M ha-m losses, un-irrigated crops constitute 42 M ha-m and irrigated crops constitute 13 M ha-m.

Per capita water availability in India

Year Population (Million) Per capita water availability (m3/year)
(amount of water/person/year)
1951 361 5177
1955 395 4732
1991 846 2209
2001 1027 1820
2025 1394 1341
2050 1640 1140


Virtual Water

Virtual water is the amount of water that is embedded in food or other products needed for its production /or defined as the total amount of water used in the production of anything from a cup of tea to a hamburger.

Table 1 : Virtual Water Content
Product Quantity Virtual water content (liter)
Vegetarian diet Daily (Adult) 1,200
Meat-eating diet Daily (Adult) 16,000
Glass of milk 250 ml 250
Cup of coffee 125 ml 140
Cup of tea 125 ml 20
Slice of bread 30 g 40
Slice of bread with cheese 30 g + 10 g 90
Potato 100 g 25
Apple 100 g 70
Glass of wine 125 ml 120
Glass of beer 250 ml 75
Glass of apple juice 200 ml 190
Glass of orange juice 200 ml 170
Bag of potato crisps 200 g 185
Egg 40 g 135
Hamburger 150 g 2,400
Tomato 70 g 13
Orange 100 g 50
Rice (paddy) 1 kg 2,300
Wheat 1 kg 1,400
Corn 1 kg 910
Soybeans 1 kg 1,800
Sugar cane 1 kg 175
Cotton seed 1 kg 3,650
Barley 1 kg 1,400
Potato 1 kg 250
Coconuts 1 kg 2,500
Roast coffee 1 kg 21,000
Tea leaves 1 kg 9,200
Beef 1 kg 15,500
Pork 1 kg 4,900
Goat’s meat 1 kg 4,000
Mutton 1 kg 6,200
Broiler chicken 1 kg 3,900
Eggs 1 kg 3,350
Butter 1 kg 18,000
Milk powder 1 kg 4,600
Cheese 1 kg 4,900
Cotton (fabric) 1 kg 8,250
Jeans 1 kg 10,850
Diaper 75 g 810
Cotton T - shirt 250 g 2,000
Wool 1 kg 2,00,000
Sheet of A4-paper 80 g/m2 10
Leather shoes 1 pair 8,000
Microchip 2 g 32
Steel 1 kg 2100
Passenger car 1,100 kg 4,00,000
Biodiesel 1 litre 9,000


Source: http://edro.wordpress.com/category/water/

Conclusion

Saving water is very important for human and our world. Water is limited resources and it is irreplaceable for all life. Without water people cannot live, without water plant cannot live, without water animal cannot live, without water firm cannot operate. No water no life, no water no future.

India has sufficient water potentiality enough for its own population, but due to severe neglect and lack of monitoring of water resources development projects, several regions in the country experience water stress from time to time. Further neglect in this sector will lead to water scarcity during the next few decades. It is therefore necessary to prevent this crisis by making best use of the available technologies and resources to conserve the existing water resources, convert them into utilizable form and make efficient use of them for agriculture, industrial production and human consumption.

As mention in the above water budget of India the utilizable water resources for various purposes was less than 10 per cent of the total precipitation. This can be improve further more by 25 to 30 per cent with the improved vegetal cover and maintaining natural resources in future years. Awareness and orientation of all the water users to change their lifestyle to conserve more water can help the country to tide over the water crisis in the future.

References:


* L Kanta Singh wrote this article for e-pao.net
The writer is Subject Matter Specialist (Agricultural Engineering), Krishi Vigyan Kendra-Imphal West, Lamphelpat, ICAR Research Complex for NEH Region and can be contacted at kanta_lai(at)yahoo(dot)co(dot)in
This article was posted on March 16 , 2013



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