Not only did they have this great bath to cleanse in, but they developed very intricate walls and canal systems in order to fill giant pools of water surrounding the city, so they had access to this water all year long. Not only would they use it for internal reasons, but they would also use it as an irrigation system for the fields in order to always have water to grow food. It's actually pretty incredible. So at the end of the day, this civilization, which is going to last for over 500, 600 years, is going to slowly start to disappear. So why don't we take a look at what made them go away. All right, guys, so all good things must come to an end. That includes the Harappa civilization.