Strategy for rainwater harvesting :
1. Rainwater barrel: A 1000 liter Sintex tank (rainwater barrel) was connected to one of the down take pipes. This was located in the utility area and the water used for washing clothes, utensils etc.
2. Existing sump tank: The runoff from the remaining roof area was collected at a single point, filtered and led into the existing sump tank by means of a flexible pipe. The rainwater was then used for all regular household activities (except drinking) in lieu of BWSSB water.
The Prajwal household found their consumption of BWSSB reduced to a minimum during the rainy season.
The household can collect over 80,000 liters of rainwater every year. This translates into about 110 days worth of water supply every year.
Having done rainwater harvesting, there was still a significant amount of overflow. On seeing this, the client is now debating whether he should direct this overflow towards “groundwater recharge” using a recharge well.
Due to heavy rains this year, we're using Cauvery supply only for drinking purpose. (The rest of the water is rainwater). Our BWSSB meter reader has declared our meter faulty and has charged us monthly average based on consumption before the rainwater system was installed.
Please use your good offices to educate BWSSB officials to expect dip in water consumption during rainy season, for homes having rainwater systems. Meanwhile we are writing clarification letter to our local water supply office.