Draining Massive Flood By Unclogging Drains, Big Whirlpools

I know you may be thinking those arrows are for finding the drains under a snowbank but the plows go right up against the curb as any good plow driver should. These arrows appeared at these drains after I reported this area to have constant flooding. The rest of the drains on the street are not marked so I assume it's flood-related if it was snow bank related I think they would have marked all of them, either way for snow or not they should have used a metal or concrete post in the ground because weather the arrows are covered with a flood or a layer of ice you won't be able to see them
Exploring anything abandoned can be dangerous or deadly without experience. I don't encourage anyone to enter any abandoned structures. Not only is safety a concern, but often times its illegal, and when possible I seek out permission from the owner or local police. I simply go to document its history before it's gone forever and I leave things the way I find them. I only take pictures and only leave footprints. I assume all the risks and responsibility before doing this. Please don't attempt to do this on your own. There could be nails, asbestos, falling concrete, soft floors, animals, or other hazards. Thanks for watching.