Water is a precious commodity and wasting water is a crime. The world’s growing population means more and more water will be required in the days to come. Water resources like groundwater and river water are already stretched to their maximum. So what should be done. Rainwater harvesting is a good way of helping solve our water needs.
In areas of heavy rain, like India, rainwater storage can be very useful. Storing rainwater is not an expensive proposition. It is basically a storage tank placed in an open area for the rain to fall into it. The water thus accumulated can be filtered or used as it is for purposes other than drinking.
Normally all the rainwater goes down the drain and is therefore wasted. This water needs to be conserved. The first step then would be to harvest the rainwater.
There are several ways in which rainwater can be harvested and used efficiently. The storage tank which harvests the rainwater may overflow. Therefore a simple system of transferring the water harvested to other tanks connected to the pipes which deliver the water for consumption is useful.
Buildings can have terraces that incline in a particular direction causing the water to flow in that direction. The outlets on the terrace can open into pipes which carry the water down into storage tanks at street level. Now this storage tank should be fitted with filters so that the water when it leaves the tank is clean of all debris. This water can then be moved upwards onto the terrace tanks, which supply water to the building.
In this way, water can be effectively harvested and put to use. This water, of course, is for general use, and without additional purification, However it is not used as drinking water.
Rainwater can be harvested using smaller containers; any water saved is good. It reduced the strain on the water supply from corporations. Using less water means raising less underground water and keeping the water table stable. A sudden drop in water levels means a water crisis, as several cities have found out to their chagrin. Water is getting scarcer, and it is time for everyone to do his bit. It is also better for the environment.
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Properly harvested, a 100 square metre plot can harvest about 60,000 litres of water if the rainfall is normal. This is about 4 times greater than the needs of a 4 member family. The average daily requirement of a person is about 10 litres. Imagine saving 60,000 litres of water. Even if you save half that amount or even one third that amount, you still have saved a lot. Hence, it is necessary to pay attention to rainwater harvesting.
Some simple methods can be used for rainwater harvesting. Using large tubs of metal can be useful; although the water saved may be small, it can still be used for purposes like watering plants and so on. Water in any quantity is useful. Of course, this is possible only in the months when rainfall occurs, but even that saving is great if everyone participates. Try and save rainwater in whichever way you can. If you don’t want to make a small investment in tanks and pipes, use smaller vessels and save as much as possible. Every drop you save is important. Rainwater harvesting means just storing the rainwater as it falls and not letting it wash away into the drains.
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