We had two or three "Code Browns" while at CBR last year - I was never at the pool when it happened, but a couple of times the "quiet" pools got a little less quiet and people said that was the reason). I think that the kids are just so over excited that they don't want to leave the pool or are having such a good time, that by the time they realize that they really had to go, it was too late....
Of course, I also suspect that some of this could be the parents - I did hear one little fellow at the pool one morning say "Mommie, gotta go poo" and mother said "Well, if you have to do that then we will have to go back to the room and swim time will be over." Well, if ya gotta go, then you gotta go and sometimes kids can't hold it in....but that situation almost made it seem like it was punishment to have to run to the bathroom (and there is one there near the pool - why they would have to go back to the room I'll never know

). If I try to put myself back 50 years when I was that age, I probably would have tried to stay in the pool as long as possible and
never said a word to my parents again if I had been told that....
I suspect that the "Code Brown"s are kids a little bit past the swim diaper stage, otherwise they would have been in one....which is supposed to "capture" the offending object.
Perfectparanoia - if all parents were as viligant as you, pool closures would probably be a rare occurrance. Kudos to you for doing what you can!!! We appreciate it