By Ishan Kukreti
This day, 22 years ago, UN decided to recognize 22nd March as the 'World Day for Water.' On this day, all the UN members implemented water conservation as recommended by the UN.
According to UNWater, 783 million people do not have access to clean water. World water demand will rise up by 70% till 2050, while many places will see declining water availability. Water is a limited resource and has to be conserved for humanity to survive.
To celebrate the day, here is a list of innovative water conservative techniques which one, irrespective of their geography or profession, can make use of to save some nectar for life.
Rooftop rain water harvesting
It is the most conventional and widely used rainwater harvesting techniques. Rooftop rain harvesting is the easiest way to collect rain water for household purpose.
Building a catchment area is required to take the rainwater down into the underground tank through several filters. The harvested water can also be used to replenish ground level water.
Suitable for – Anyone who owns a house with a roof.
Cost – Rs. 10,000 – Rs. 30,000
Cycle run water pumps
In 1980 Nasiruddin Gayen, a small farmer from West Bengal conceptualized this unique invention. Instead of mechanical motors a cycle pump is used. The process not only reduces the cost of fuel but makes the person pump the amount that is required.
Paddling the cycle creates an up and down movement in the pump and this can release 100 liters of water per minutes
Suitable for – Small scale farmers, can also be used in urban settings
Cost – Less than Rs. 7000
This method can be used to harvest rainwater in the coastal areas to dilute groundwater salinity where there is a problem of saline ground water.
Rainwater is collected from the roofs and is stored in a pressure tank. With the help of PVC pipes, the water is then transferred below the sea level of 16-24 ft. The water gets stored in the vertical groundwater column and can be used later with the help of a pump or motor.
Suitable for – Coastal areas
Cost – N.A
This is an absolutely fun filled way of conserving water. In this technique, under a merry-go-round or a see-saw, a conventional hand pump apparatus is fixed.
A tank (8-10 feet above ground level) is filled with ground water as the kids play on these rides.
This technique has been designed to cope with water scarcity problems in villages with no clear surface water source, electricity issues and high poverty.
Suitable for – Schools, parks, villages and relief camps.
Cost – N.A
This is a cheap and durable method of rain water harvesting. All it requires to make a Ferro-cement tank is sand, cement, mild steel bar and galvanized iron wire mesh and semi-skilled laborers.
These tanks are light in weight and can last up to 25 years. The tanks can store up to 1000-2000 liters of water.
Suitable for – High rainfall regions