posted 13 years ago
water is always going to travel to the lowest point. in this case, that means it will drain back into your pond. it's likely that some of it will drain out the side you want as the pipe starts sucking air, but only until the pipe is drained.
however, if your windmill is aerating your pond, you could almost certainly use it to make an air lift pump. the idea is that air bubbling up through a tube will carry some water with it past the elevation of the water level. I think that's going to be your ticket. there's plenty of information concerning air lifts available.