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Rainwater Harvesting (Practical Action Technical Brief)
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== Components of a domestic RWH system == Domestic RWH systems (DRWH) vary in complexity. Some of the traditional Sri Lankan systems are no more than a pot situated under a piece of cloth or a plastic sheet tied to four poles. The cloth captures the water and diverts it through a hole in its centre into the pot. In contrast, some of the sophisticated systems manufactured in Germany incorporate clever computer management systems, submersible pumps, and links to [[grey water]] and domestic plumbing system mains. Somewhere between these two extremes, we find the typical DRWH system in use in developing countries. Such a system will usually comprise a collection surface (a clean roof or ground area), a storage tank, and guttering to transport the water from the roof to the storage tank. Other peripheral equipment is sometimes incorporated, for example: first-flush systems to divert the dirty water which contains roof debris after prolonged dry periods; filtration equipment and settling chambers to remove debris and contaminants before water enters the storage tank or cistern; hand pumps for water extraction; water level indicators, etc.
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