not sure where this is but looks like a whirlpool in/near barkers
https://twitter.com/TedLandK5/status/902610514810896384
That’s not good if that’s near/on barkers.
In your twitter link to a whirlpool picture, I will hazard a guess as someone who has built various detention structures.
If this is like the other structure the principle outflow is a pipe of a limited diameter. That has a shut off but after the first day of the storm, it opens and eventually drains the basin after 40 to 50 days. The piped outlet creates a whirlpool but does not necessarily indicate a a problem.