Not that I am aware of. The water is shallow, around 18” inches deep, and there are officials and others around the water jump. If someone was knocked out and in the water at the same time, they would be attended to quickly.
We weren't seriously injured. The horse did knock himself out on the other side of the fence. I thought I'd killed him and tried to stand up to go to him (wind was knocked out of me). I remember my French coach running out and grabbing him by the bridle and punching him. The horse jumped to his feet and seemed fine afterward. I'd never ridden him before or after that day.
I eventually stopped showjumping because of the fall, it shook me so badly. I even quit riding for about 6-8 months (which is a long time!).
Every time you canter up to a fence, the feeling of flipping over the top bar comes back to you. Every time. I still get so panicked jumping I don't remember the last stride, the jump or the stride after at the end of a course.