http://www.stoneycreekequip.com/form/pumps2.htmI was also thinking the waterfall pumps that are rated for continuous use too. However there are even larger electric pumps made especially for dewatering in the AES catalog. But I believe they are a few grand.
I use a smaller sump pump version I got at a building supply store that is rated at about 50 gpm's to drain and fill my small 1/10th acre ponds. That pump moves about 100,000 gallons in 3 to 4 days with a head up to 8 feet once the pond really gets down. I put it inside a five gallon bucket to keep it from sucking the bottom. I also tie a rope to the end of the bucket to move it around while standing on the bank. It's a good idea to criss cross the open end of the bucket with rope to keep the pump inside as you move it around with the rope tied the the back of the bucket.
I have a trash pump that pumps 150 gpms but I have a neurotic neighbor in the back that complains about the noise with that pump. With the electric I can pump 24/7 too without constantly filling with gas. As gas prices go up I'm not so sure electric is that much more expensive is it?
