Rainwater harvesting

Rainwater harvesting (RWH) is the collection and storage of rainwater, rather than allowing it to run off. Rainwater is collected from a roof-like surface and redirected to a tank, cistern, deep pit, aquifer, or a reservoir with percolation, so that it seeps down and restores the ground water. Rainwater harvesting differs from stormwater harvesting as the runoff is typically collected from roofs and other area surfaces for storage and subsequent reuse.

Its uses include watering gardens, livestock, irrigation, domestic use with proper treatment, and domestic heating.
The harvested water can also be used for long-term storage or groundwater recharge.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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