Rainwater harvesting was practiced in ancient time, discuss with suitable examples.

 Civilisations in the Indus Valley were far more advanced than we may think nowadays. In many of the ancient cities that still remain, we can still find huge vats that were cut into the rock to collect water when there was torrential rainfall. These were used to keep the population and local vegetation going in hotter, dryer times and were fed by numerous stone gullies that weaved their way through the city. Some of these rock vats are still used today in parts of India.

Another technique that has been used for hundreds of years in India is to build water harvesting systems on top of the roofs of houses. It’s ______ ___ __________ ____ ______ ________ _________.
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