Tried to find a pool photo that would show, but didn't have anything closeup enough. I think 2IAB is correct. There is a depth marker right by the pool slide that I can't make out, but there is another marker maybe 25 ft away that does indicate 3 ft 6 inch. So I would guess it is probably right at 3ft at the slide.
If Lisareniff knows the stats on this one I'm going to.... I don't know what.