Martin, I don't know how much good a trolling motor prop attached to a pier will do over an acre. You might consider renting or buying a 2 inch gasoline powered pump and spraying the water into the air. Actually, a one inch pump might be better. You could hook it to a large sprinkler on the pier and not have to hold the output hose. Of course, by the time you do all of that, the problem will probably be over.
