section_path: Structures used in artificial waterways
section_name: Structures used in artificial waterways
paragraph_text: Structures used in artificial waterways
  
  Both navigations and canals use engineered structures to improve navigation:
  
  Since they cut across drainage divides, canals are more difficult to construct and often need additional improvements, like viaducts and aqueducts to bridge waters over streams and roads, and ways to keep water in the channel.