Rainwater harvesting systems capture rainwater by directing it from large surfaces (e.g. roofs) to an underground or over-ground holding tank. The harvested rainwater is filtered and then pumped directly to the appliances or to a header tank. For more information visit http://www.rwh.in/ & http://www.rwh.in/sitemap.htm
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For US citizens, the following links shall be useful for deciding a complete RainWaterSystem
https://www.rainharvest.com/complete-systems.asp https://www.rainharvest.com/complete-systems.asp .
If one want to do DIY than he can go through Texas Manual on Rainwater Harvesting.
http://www.rwh.in/sitemap.htm .
For understanding RainWaterSystem, kindly go through the case-study on Rainwater Harvesting and Purification System at http://www.rwh.in/ .