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Rainwater harvesting is the accumulation and deposition of rainwater for reuse before it reaches the aquifer. Uses include water for garden, water for livestock, water for irrigation, and indoor heating for houses etc.. In many places the water collected is just redirected to a deep pit with percolation. The harvested water can be used as drinking water as well as for storage and other purpose like irrigation.
Contents
• Advantages
• Quality
• System setup
• Vendors
• Rain water harvesting by freshwater flooded forests
• New approaches
• History o Earlier o Present day
 India
 Sri Lanka
 United Kingdom
 Israel
 Non Traditional
Advantages
Rainwater harvesting provides an independent water supply during regional water restrictions and in developed countries is often used to supplement the main supply. It provides water when there is a drought, prevents flooding of low-lying areas, replenishes the ground water level, and enables dug wells and bore wells to yield in a sustained manner. It also helps in the availability of clean water by reducing the salinity and the presence of iron salts.
• Makes use of a natural resource and reduces flooding, storm water, erosion, and contamination of surface water with pesticides, sediment, metals and fertilizers.
• Excellent source of water for landscape irrigation, with no chemicals such as fluoride and chlorine, and any dissolved salts and minerals from the soil.
• Home systems can be relatively simple to install and operate and it may reduce your water bill.
• Promotes both water and energy conservation.
Quality
The concentration of contaminants is reduced significantly by diverting the initial flow of runoff water to waste.New Scientist, 3 April 1999. Improved water quality can also be obtained by using a floating draw-off mechanism (rather than from the base of the tank) and by using a series of tanks, with draw from the last in series. The stored rainwater may need to be analyzed