Many historians and archaeologists believe that the Indus Valley Civilisation that existed about 2,500 years ago mysteriously lost its existence and disappeared suddenly due to catastrophic water scarcity caused either by shifting rivers or by drastic climate change.
In India, a major portion of the population does not have a reliable and constant means of getting water for their daily needs. About 70 per cent of our sources are contaminated and country’s major rivers are dying because of pollution. In June 2019, a report suggested that 65 per cent of all reservoirs in India reported below-normal water levels, and 12 per cent were completely dry.
A NITI Aayog report of 2018 clearly stated that nearly half of India’s population, about 600 million people, is all set to face extreme water stress in coming years. NITI Aayog also estimated that 21 major cities, including Delhi, would run out of groundwater by 2030.
With time, India has become the world’s largest extractor of groundwater, accounting for 25 per cent of the total available water. Agriculture consumes over 85 per cent of water in India, contrary to the popular belief that domestic usage or industrial usage captures most of the water. With only 40 per cent assured irrigation, the farmers depend heavily either on rains or on groundwater for their needs.
Surprisingly, the irony is, the demand for water through rains is much less than actual rainfall received during the year. Even though the monsoon season in India extends over four months, and we barely get 30 days of heavy rainfall in all, India has not put-in much required efforts to wishfully capture this abundance of rainwater.
India needs a maximum of 3,000 billion cubic meters (BCM) of water a year while it receives 4,000 billion cubic meters of rains. The country captures only 8 per cent of its annual rainfall, which is amongst the lowest in the world. This also means that rain water harvesting and replenishing the ground water, and also conserving the available water resources seems to be one of the most efficient and doable solution, that has scope and opportunity to resolve water scarcity.
There are many lessons in traditional water harvesting system in India too. One of the most popular rainwater conservation practices has been raindrop conservation. Water from the rooftops was collected during the rains and stored in tanks.
Water in community areas was collected and stored in artificial wells. Another method was harvesting monsoon water by diverting water from overflowing streams to be stored in water bodies.
The traditional procedures for saving water had their own methods too. The PATS of Jhabua district of Madhya Pradesh are irrigation panels. These irrigation panels are fed using water that is diverted from fast moving hill streams. ( IANS )
