Pond Boss Forums POND CONSTRUCTION Building a dam Increase spillway pressure outflow

Just had this thought in reading the posts here again - could you just neck down the size of your outflow pipe to gain additional pressure to turn the water wheel? I don't know if that would work from a physics standpoint or not, but it seems like that's the concept behind a garden hose nozzle to some degree. Another potential issue that comes to mind is that if the outflow pipe diameter is reduced, I guess there's a chance that it wouldn't keep up with the flow entering it on the pond side and could eventually result in water levels rising to the point that water overflows your dam.

See? This is the hazard of a non-engineer playing around at offering an engineering-type fix!