Indus Valley | Clues to an Ancient Civilization, National Geographic: The Main Sewer Drain in Ancient Harappa | Pakistan

Workers excavate the main drain for the Harappa site. The drain is located at one of the main gates to the city. Indus valley communities are within a days walk of each other, had the first known sewer systems, standardized mud brick structures, systems of trade and measure, seals (credit cards), and other inventions that exist to this day.  Recently in Gujarat after an extended drought caused deaths from a shortage of water, emergency workers and heavy equipment were brought in to build a temporary reservoir.  One of the bulldozers ran into the corner of a huge reservoir, constructed during ancient times, that was by far superior to anything the locals have today.

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