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The structures became more sophisticated and much bigger when the streams turned to rivers. In the arid and semi-arid regions, where the streams are more seasonal, the diversion channels first led the water to a storage structure like a tank for later use.Storage systems to collect just runoff from the watershed were also built. In the flood plains, several unique systems to control and harness the floodwaters were devised. In regions with good groundwater aquifers, dugwells with innovative methods to lift the water were in use.Several wells were also dug in the bottom of the tank to ensure adequate water supply in the dry months.a.
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Early people cut channels, diverted rivers, and farmed their regions.
Wells had been dug in the cities of the Indus – Sarasvati Valley by the third millennium B.
Even rainfall as low as 100 mm, if harvested properly, can meet the drinking water needs of the people.
Rivers were the obvious location of civilizations, and different civilizations utilized them in different ways.
Despite being crisscrossed by a complex network of rivers, vast stretches of India have neither river nor lake to depend on.