How is rainwater harvesting done? Explain.

State the advantages of rooftop rainwater harvesting.

Give geographical reasons —

1. River Damodar is called "river of sorrow".
2. Irrigation by canals is more suitable in northern India as compared to the south.
3. Tank irrigation is used in peninsular India.

Answer in one word —

1. A plastic tube which has small holes through which water keeps on dripping
2. An ancient irrigation system in North East part of India.
3. Tube-wells are used extensively in UP and Bihar and are very popular