In Florida there is a large amount of rainfall. Because Florida is mostly flat and not very high in elevation above sea level, in order for the land to be developed, the water had to be drained off the land. Just about everywhere, there are drainage ditches, drainage canals, water retention ponds, and storm sewer systems that empty into retention ponds or other water ways.
There is a man in Florida known as “Monster Mike”, who fishes in canals and drainage ditches, and posts his fishing videos on YouTube. Here is a video of him catching a very large, beautiful, strong, and healthy fish in a storm sewer underneath a road.
You should look at his YouTube channel to see him catch fish in tiny overgrown ditches.