Of course, some might " float" a " tub" full of questions about " flood insurance" or " indoor plumbing" , but as long as the idea holds " water" and hopefully the home doesn't.
Another common expression, " to hold water" , is about the strength or weakness of an idea or opinion that you may be arguing about. It probably comes from a way of testing the condition of a container.
Now, that's sponge is sustained by forests, protecting water or creating rainfall, receiving rainfall and flushing it down into the peatlands that hold that water for thousands of years.
But that can't be due to human activity. The only way for the atmosphere to hold more water vapour is if it gets warmer. So... Hang on, you're not saying...