Water is our most precious natural resource and something that most of us take for granted. We are now increasingly becoming aware of the importance of water to our survival and its limited supply, especially in such a dry continent as Australia.

The harvesting of rainwater simply involves the collection of water from surfaces on which rain falls, and subsequently storing this water for later use. Normally water is collected from the roofs of buildings and stored in rainwater tanks. This is very common in rural Australia. Water can also be collected in dams from rain falling on the ground and producing runoff.

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copied from the wikipedia
i have this
i've modified it and sorry for copying
Rainwater harvesting is the process of collection of rainwater from surfaces on which rain falls,filtering it and storing it for multiple uses.The most common way to store rainwater is rooftop rainwater harvesting.
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