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Explain the different methods of rain-water harvesting which is carried out in India.

The most basic method is to put rain-water barrels in a place where water is most likely to collect off of: from the eaves-trough drain pipe, or underneath a tin roof on the garage or another building that does not have an eaves through that the rain runs off of.

The above is much easier and quicker to get rain water from than leaving barrels out in the middle of the yard or field to collect rain.