[[Image:RAIN logo.jpg|thumb|right|130px|[http://www.rainfoundation.org/ Rainwater Harvesting Implementation Network]]]
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Rainwater harvesting refers to structures is a technique of collection and methods storage of catching rainwater directly from roofs into natural reservoirs or indirectly through tanks, or the infiltration of surface water into subsurface aquifers (before it is lost as surface runoff or spring catchments. It is then stored in underground (or above-ground) tanks or natural catchments for later use. For roof capture, rooftop harvesting most any suitable roof surface — tiles, metal sheets, plastics, but not grass or palm leaf — can be used to intercept the flow of rainwater and provide a household with high-quality drinking waterand year-round storage. Surface Other uses include water capture can be through a damfor gardens, livestock, springboxand irrigation, or groundwater recharge (includes in situ methods)etc.
<font color="#000099" size="3">The reasons for using rainwater harvesting systems answer three questions:</font>
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|<center> <font size="3" color="#0091de"> Rainwater Harvesting TOOLS- simple methods applicable to project planning</font> </center>
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|<center> <font size="3" color="#0091de"> Rainwater Harvesting TECHNOLOGIES- technical construction details, costs, and applicability</font> </center>
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|<center> <font size="3" color="#0091de"> Rainwater Harvesting INNOVATION PILOTS- projects in practice on 3R, MUS and sustainable financing</font> </center>
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