This photograph is an example of developed drainage in Indus Valley civilization.
Indus Valley civilisation is credited with developing the science of Hydrology. They also made proper drainage and irrigation canals based on river flow and rainfall. It was a new science developed.
Lighthouse was invented by ancient Egyptians to direct their ships. Alexandria was a busy port even then.
Harappan civilization people built “levees” to control floods. It is obvious that Indus river would flood often.
Levees are raised platforms or earthfills.
Ancient Indians are also credited with the invention of Docks for ships and boats. This was a remarkable achievement by all standards. The world’s oldest dock is in the city of Lothal in the city of Gujarat, India.