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Rainwater harvesting (RWH) is the collection and storage of rain, rather than allowing it to run off. Rainwater is collected from a roof-like surface and redirected to a tank, cistern, deep pit (well, shaft, or borehole), aquifer, or a reservoir with percolation, so that it seeps down and restores the ground water.
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Various methods of rainwater harvesting are described in this section.
Surface runoff harvesting. In urban area rainwater flows away as surface runoff. ...
Rooftop rainwater harvesting. ...
Rooftop Rainwater Harvesting System. ...
Catchments. ...
Transportation. ...
First Flush. ...
Filter. ...
Sand Gravel Filter.