Just for fun…
LA Times article about what’s found in the bottom of the fake ponds at Disneyland when they drain them for maintenance.
Interesting claim: the water was originally stocked with actual live fish! Of course, now no fish could live in it. Which highlights the next factoid: they didn’t drain the water to “the ocean”. I presume they mean they didn’t drain it to local storm sewer, Disneyland isn’t that close to the ocean.