In reply to remus:
> (In reply to EZ) Throwing a rock in wont have the same effect as blowing loads of bubbles through the water.
That's right - the swimming club here are very clear about the high board. You want 3 things:
1. to be able to see the surface, not the bottom (so ripples good)
2. to be able to tell which way is up (so no blue or light-colour tiles)
3. to have a bubble blower which makes the water actually a mixture of air and water. The air compresses on impact; water is incompressible (and the surface tension has nothing to do with this).