Question

principle of water harvesting

Answer 1

simply to capture non-potable water at the point it falls, then substitute it for mains water in non-potable applications; in the process, the effect of heavy rainfall on flood-risks can be alleviated and energy is saved by not using highly processed tap-water to flush 

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Answer 2

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The basic principle of rainwater harvesting is simply to capture non-potable water at the point it falls, then substitute it for mains water in non-potable applications; in the process, the effect of heavy rainfall on flood-risks can be alleviated and energy is saved by not using highly processed tap-water to flush ..
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