Indus people were the first to build planned cities with scientific drainage system. The Indus cities were built on an uniform plan. Town planning was amazing in nature. A few cities have citadels to the West built on higher platform and to the east of which is the hub of residential area.
In the Indus valley civilization, there was a sound drainage system. The streets were intersecting at right angles. There was a high ground which was used for administration building and a low ground which was used for house of common people