The process of rainwater harvesting is not a new process. Historical evidence shows that the process was widely used in southern India, during the rule of the dynasty of the Cholas. It is a process where the rainwater is accumulated and is processed naturally (before it can reach the aquifer level of the soil). The water is then made reusable and is used for fulfilling the daily household requirements such as, drinking, washing, gardening etc. Processing of the rainwater in a natural way kills the germs and the bacteria present in it, and make it completely safe for drinking also.
The process of harvesting rainwater is somewhat simple and can be undertaken by every household. It also helps in eliminating scarcity of drinking water. In the modern day, the process is followed by accumulating rainwater at the rooftops or in specially built catchment area by the side of the buildings. The harvested water is then processed and circulated for human usage. This process also proves beneficial to bring down the purification and the supply costs of the water stations of any city. Therefore, harvesting of rainwater has far-fetched results, and should not be neglected.
A simple process for filtering of rainwatercan be maintained through usage of a series of filtering tanks. The water from the topmost level can be collected after completion of the process of siltation at each tank. At the end, clear and naturally filtered water can be used to meet the daily household needs, without any hesitation. However, proper care should be taken so that the tanks do not get infected by any means. It is also suggested to check the water, finally collected, before using for human consumption.
Rainwater harvesting is most commonly done by collecting the rainwater from the roofs of the houses through various means. The water is then allowed to get accumulated in a tank, where natural filtration is done by allowing the water to percolate through a layer of coarse sand, along with pebbles. This method is cost-effective and even safe, since there is very little chance of the collected water to get contaminated with chemicals, which is otherwise used in the large water filter stations of the cities.
In various parts of the world, the rainwater collected from the rooftops is even stored in the nearby bore wells, where natural filtration is done. However, it is necessary to clean up the bore well before such actions are performed, in order to get naturally filtered and pure water.
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Rainwater harvesting will ensure supply of adequate quantity