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Rainwater for urban areas

For urban areas with less than 1500 mm annual rainfall, rainwater harvesting in artificial containers is of very limited application and practicality considering year round demand.  In such situations bore well or deep open well based recharging combining roof catchments collection and storm drain collection is found the BEST. 

Considering rainwater harvesting potential, Bangalore in India; receives average rainfall of 900 mm, which is poured in about 53 rainy days. Hence an acre land in Bangalore paves way to receive 3.6 million liters of water. Again 80% of these rainy days and rainfall quantity is received between June to November annually. However, one cannot collect this entire water to store in a concrete/plastic tank for future owing to tremendous volume and costs.

Therefore, best feasible option is to collect roof water and storm water together from the ground/existing storm water drains and then recharge post filtration into the water table directly through mini bore wells specifically designed for the same. Therefore, instead of storing rainwater in artificial containers, it is proposed to collect and divert to recharge the existing aquifer locally. This process is graphically depicted next :

   
 
 
 
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