Harvesting a crop has been very common in our life, without which we can’t get our food. Of late another harvesting called rainwater harvesting has become an important topic for discussion. In brief, rainwater harvesting is nothing but storing rainwater in a tank and using it later for various purposes. Scientists believe that our planet is covered with 70{4aae73461effa9263855888e11b82afb29be8624bd70156d49c18cab7ecb130d} water. This means the earth has more water than the land. Then what is the need to harvest rainwater?
Though, we have abundant source of water on the earth, only 0.1{4aae73461effa9263855888e11b82afb29be8624bd70156d49c18cab7ecb130d} is useful to us because we can’t use seawater either for drinking or any other purpose. Seawater is unfit for drinking due to high content of salt and chemicals present in it. So, the amount of freshwater is very limited. Even in fresh water, a large part is frozen in the form of ice at the North and South Pole of our planet. Therefore, we are left with a small fraction of 0.01{4aae73461effa9263855888e11b82afb29be8624bd70156d49c18cab7ecb130d} for useful purposes. It is this small fraction that forces us to store rainwater so that we don’t have to look elsewhere.
Normally, the rainwater, which is comparatively fresh, falls on the ground and flows to river or sea. So once the water enters sea, it becomes useless for us. This implies that if we can stop the rain water in between and direct its flow towards a storage tank then it becomes the source of fresh water. The procedure is very simple. A place is chosen where there is a great flow of rain water, say a roof top. This place is connected to a storage tank and water is allowed to accumulate there. Subsequently, this stored water is used for various purposes. This effective technique can save huge amount of water.
The concept of rainwater is gaining ground in big cities, where there is a scarcity of water due to increasing population. Even in the independent houses also, this can be practised. The harvested rainwater can reduce the pressure on the tap water and hence address the problem of water shortage.