Decorative canals
In Orestad it seemed like there were a lot of canals, and that for the most part many of them seemed to serve no real purpose. I don’t think they were natural bodies of water or really served a water drainage function (though I could be wrong about that) instead to me they were just there for aesthetics, they were purely decorative canals. Put there because they looked pretty and made Danes happy in a weird suburban way. And if you ever need to get rid of a bike in a hurry they are a convenient place to dispose of it. (I did not dump my bike in a canal but I sure thought about it.)