Rainwater harvesting is a technique of collection and storage of rainwater into natural reservoirs or tanks, or the infiltration of surface water into subsurface aquifers (before it is lost as surface runoff). One method of rainwater harvesting is rooftop harvesting. With rooftop harvesting, most any 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 water and year-round storage. Other uses include water for gardens, livestock, and irrigation, etc.
<font color="#305ea9555555" size="3">'''The reasons for using rainwater harvesting systems answer three questions:'''</font>
<font size="3">What</font>: Rainwater harvesting will improve water supply, food production, and ultimately food security.
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|<center> <font size="3" color="#909090555555"> '''Rainwater Harvesting TOOLS ''' <font color="000#8C8C8C">- simple methods applicable to project planning</font></font> </center>
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|<center> <font size="3" color="#909090555555"> '''Rainwater Harvesting TECHNOLOGIES ''' <font color="#0008C8C8C">- technical construction details, costs, and applicability</font></font> </center>
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|<center> <font size="3" color="#909090555555"> '''Rainwater Harvesting INNOVATION PILOTS ''' <font color="#0008C8C8C">- projects in practice on 3R, MUS and sustainable financing</font></font> </center>
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