harvesting
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Water harvesting is the direct capturing and use of runoff on-site. This can mean maintaining the water level in permanent ponds and wetlands or supplying water for irrigation and domestic purposes. For this the runoff either is stored and trickles away directly where the plants grow (runoff agriculture) or it is stored in tanks and reservoirs for later use. Generally the term “water harvesting� comprises many techniques that are used to supply rainwater collected from surfaces (roofs, ground surface, rock surface) for domestic or agricultural use. It can be defined as “... the process of concentrating rainfall as runoff from a larger catchment area to be used in a smaller target area�
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