Question
What is a rain water harvester? How does it work?

Answer

It is a storage tank usually fitted underground to your down pipes coming from the roof. Rainwater enters the tank through a filter which removes the leaves and other debris. The system contains a pump which pushes or sucks the rain water back into the house where it is delivered to the toilets or clothes washing machine. The tank is placed in the dark and kept oxygenated to prevent the growth of algae. This filtered untreated water should not be used for drinking.
Rain water harvesters can be installed in houses, bungalows, large sheds or any building with a roof on it to capture the rain water. Commercial premises are very suitable as they often have a larger roof space and higher percentage of water use that can be replaced by rain water.

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Study the extract of the Survey of India Map sheet No. 45D/10 and answer the following questions:
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(i) Triangulated height 217
(ii) A lined well near Chekhla.
(b) 
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(ii) State the direction in which this left bank tributary is flowing.
(c) 
(i) Mention a special feature associated with the streams in grid square 9879.
(ii) Name the types of drainage pattern found in grid square 9382.(d) Give the four grid reference of each of the following:
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(ii) Bantawada.
(e) Name two relief features that can be seen in grid square 9782 and 9574.
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(g) What is the compass direction of Antroli (9576) and Chekhla (9281) from Sangla?
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(j) 
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