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It has been made mandatory to install ra...

It has been made mandatory to install rain water harvesting system and solar water heater in all buildings in urban areas.
(i) What is the rational when rain water already passes into drains?
(ii) Why are solar water heaters are being installed when electric geysers are available?

Text Solution

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(i) Rain water passed into drain does not enter the ground but is taken out of the urban area and poured into a water body at quite a distance with or without treatment. However, ground water is being withdrawn everywhere for drinking, industrial and irrigation purposes. As a result, the level of ground water is going down and arid conditions are being faced in many areas. In rain water harvesting, rain water from a building is passed directly into ground dug-wells or water pumps. This recharges ground water.
(ii) Installation of solar water heaters is a method of saving electricity which is always in short supply due to rapid urbanisation, industrialization and intensive agriculture. Coal/gas based power plants are polluting units they add carbon dioxide to the atmosphere causing global warming. Saving electricity is now valued social resonsibility.
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