Rain water harvesting – method, process, price

Are you thinking of saving rainwater and replenishing your water source,  If you have a rainwater harvesting facility installed in your house, one evening’s rain for two hours is enough to give 8,000 litres of drinking water, which will suffice a family of four for seven days. With Bangalore having about 60 to 80  rainy days inside a year, it is estimated that residences with a 100 sq m roof can gather about 97,000 litres of drinking water per annum that will take care from the drinking water needs for about 200 to 230  days.

Let us check the cost factor for this implementation. The pipes price about Rs 15 to Rs 30 per running foot and the storage systems about Rs 2 to Rs 3.50 a litre and the bends and elbows between Rs 20 and Rs 75, bringing the total cost to Rs 4000-Rs 5000.

When considering the appartment and housing cost of bangalore which is a minimum of 20 lakh this cost is very minimum and benefits are great ,Assuming a 20-year life period for the structure, the price per kilolitre works out to less than Rs 4 a kilolitre making it very cost-competitive. City supplies have a production price of Rs 15 per kilolitre.

The process of rainwater harvesting would encompass catching rainwater, directing it to an appropriate location and filtering it, if required, and storing it for use. Storage could be in tanks, sumps, ponds or lakes. Recharging of ground drinking water is also possible. Mr Vishwanath who started the Rainwater Club in Bangalore says in a study by the Karnataka Government, `A conceptual framework for rainwater harvesting for Bangalore’, it was found that the city receives about 3,000 million litres per day of rainwater with an area of 1,279 square kilometres.

Let me know if you need more details.

Tags: conserve rain water