Rooftop rainwater harvesting
Posted: Friday, August 22nd, 2008 | Posted by: Roshan L | Views: 18971
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It is known fact that many habitations around us do not have adequate water supplies. The wells are drying faster than ever and the count of abandoned borewells growing each year. The situation is quite dangerous than it seems and hence it is absolutely necessary to act today to preserve our natural source of water and also educate our future generation to follow the same.

The simplest method is to follow Rooftop rainwater harvesting, as much rain water flows un utilised from our roof tops. So, what is Rooftop rainwater harvesting

This is the process of collecting and storing rain that falls on rooftops for future use. Through a simple rooftop rainwater harvesting system it is possible to provide households 20 litres per family per day, lifeline water at the doorstep, for the whole year in the state of Karnataka.

The costs involved for the rooftop rainwater harvesting can be kept to a minimum using local materials and local skills to reduce costs and to keep the money in the local economy. The costs are one time and the benefits are for a lifetime. There is virtually no maintenance costs.

The process seeks to pick up rooftop rainwater from any roof except thatch or grass , direct it through rainwater gutters through a filter into a 6000 litre tank built for storing rainwater.

Given 500 mm of rain on a 20 square metre roof area, about 10,000 litres of pure water falls on the rooftop. At present, this precious resource is not put to any productive use. By educating communities and individuals to keep the rooftop clean and by building a good rooftop rainwater harvesting system, water free from fluoride, nitrates, salts, iron and other contaminant can be made available to families for their drinking and cooking needs.

With assistance from goverments or voluntary organisations it should be possible to make this investment as a supplementary source of water in many of our villages.

Water treatment
The stored rainwater can be treated using a system called Solar Disinfection or SODIS to improve its quality. This process is simple and involves filtering the rainwater through a cotton cloth folded three times into a glass or PET bottle and leaving the water in the sun for five hours. Microbial disinfection takes place in the water.

Comments
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The need of the hour for people in DK. Though we have are blessed with good rainfall, we have acute shortage of water. Industries in and around the mangalore city drink precious fresh water. That leaves us with no option other than recharging the ground water.

I hope that the municipality has made rainwater harvesting compulsory for all high rise structures/ apartments.
Posted By: K, Wednesday, January 07th, 2009