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Rainwater Harvesting (Practical Action Technical Brief)
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==== Collection Surfaces ==== [[File:pract.act.rain.water.fig.1.jpg|thumb|left|Figure 1: A typical corrugated iron sheet roof, showing guttering]] For domestic rainwater harvesting the most common surface for collection is the roof of the dwelling. Many other surfaces can be, and are, used: courtyards, threshing areas, paved walking areas, plastic sheeting, trees, etc. In some cases, as in Gibraltar, large rock surfaces are used to collect water which is then stored in large tanks at the base of the rock slopes. The style, construction and material of the roof affect its suitability as a collection surface for water. Typical materials for roofing include corrugated iron sheet (also known as tin roof), asbestos sheet; tiles (a wide variety is found), slate, and thatch (from a variety of organic materials). Most thatch are suitable for collection of rainwater, but only certain types of grasses e.g. coconut and anahaw palm (Gould and Nissen Peterson, 1999), thatched tightly, provide a surface adequate for high quality water collection. The rapid move towards the use of corrugated iron sheets in many developing countries favors the promotion of RWH.
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