I mean.. swimming didn't conflict with any other sport but diving, and swimming got precedence. We practiced in the morning because it was a good time for it.
At small schools, you're probably going to only have 1-3 members of staff qualified to train students (qualified is a very loose term here).
I suppose I could be mistaken about staffing conflicts. My small school didn't have a pool, so there really wasn't anything resembling any sort of water based sports (unless you just wanted to swim in a lake).