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Rivers are used for transportation, irrigation, generating energy and performing work, such as turning waterwheels. Rivers are also vital sources of fresh water for both industrial and residential applications.
The main purpose of the roads were to hold the Empire together and create a network of communication and stability. Today, roads and bridges are still used; however, the Inca region has became advanced with railroads. Trains are used mostly for the tourist that come and visit Peru and Columbia.n contrast, stone was laid over the roads and canals for wet areas.The Inca road system was highly used in the Inca state and often used to move government messengers, Inca armies, royal litters, or state trade caravans.