Dig Canal
Dig Canal is a command players can give to citizens. This allows the player to select an area via clicking and dragging to be dug out. This can only be done on open, outside ground. Once a canal is dug, it will immediately be filled with water, which can be removed via another command.
Like standard ground, canals can be walked over, even if they're filled with water. They can also contain fish, so players can even create their own fish supply. Though unlike natural water that's placed by the game, water-filled canals do not increase fertility, but they can provide farms some irrigation if the water tiles are right next to the farm, making farms work much better.
Water can be removed from canals with the Remove Water command.
In-game description
"Dig a canal. Can only be placed where water once was."
Trivia
- Despite the fact that the in-game tooltip says that canals can be placed where water was, this doesn't seem to be the case, as canals can be placed on any open ground.