Archaeological excavations so far have revealed the existence of over 700 wells, together with a drainage and bathing system. Scientists concluded that waterworks and wells were the first investments made in the area of the emerging city. This number of wells shows that the inhabitants relied solely on the annual rainfall and the waters flowing near the Indus. It is believed that these wells - round, brick - are the invention of the Indus Valley Civilization (there are no designs of such structures from Egypt or Mesopotamia from this period, or even later). Also, the drainage system along the road, which efficiently removes most human waste and wastewater, was a very innovative project, although the drains drained the wastewater towards the Indus.
