“Rain water harvesting means arresting rainwater during monsoon storing it in natural reservoirs (aquifers) and artificial/ manmade reservoirs (tanks)”. The harvested rainwater can be used for flushing, washing, gardening, irrigation and even consumption with necessary treatment.
We all know that rainfall is seasonal and it occurs over a short period of time during the monsoon season followed with a long dry spell. During this long dry spell water is drawn from rivers, lakes, ponds and underground water sources by tube wells / bore wells etc. that leads to decreased ground water level. Experts opine that the rain being the purest form and major source of water must be saved for recharging the underground aquifer to solve the problem of water scarcity in the cities and towns due to bulging population.
Rainwater harvesting is an age-old practice in India. In ancient Tamil Nadu (India), rainwater harvesting was done by Chola kings. Rainwater from the Brihadeeswarar temple was collected in Sivaganga tank. During the later Chola period, the Vīrānam tank was built (1011 to 1037 CE) in Cuddalore district of Tamil Nadu to store water for drinking and irrigation purposes.
In South India, the tradition of establishing a tank alongside a temple prevails. Since every village has a temple, it also has a temple tank. These tanks were constructed to harvest water. They captured rainwater and runoff. In ancient times the temple tank always had water, even when all other sources had dried up.
Some of the Ancient 'Water Harvesting Structures' used in different rural regions of our country are still in use.
Water from the terrace is collected in holding tank during monsoon season and utilized.
Water runoff in Storm Water drain during monsoon season is diverted to various recharging pits with borewell.