John,
You have had me scratching my head here because you started off sayng that it was a small pond. Not your fault, I was picturing a small goldfish pond that someone puts in a plastic insert in the ground and fills with water.
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2 things, is a sump pump even made to be submerged? They're supposed to pump well before it gets submerged.
The other thing, why not a fountain? Many Condominium complexes and golf Courses etc I've seen have floating fountains in them. The pumps are made so that a cord of any length can be attached and then the connections get sealed by pouring in some plastic resin or such. That sounds like what you need. If they don't want a fountain maybe you can let it hang down from an innertube so that it is below the surface but not touching bottom. and make sure that it has an adequate screen to keep out debris.
It would still be floating and could be easily pulled to shore for service.
Bill
