George have you looked into a liner for your pond? It might be less expensive than other methods. I got a small one from Bend Tarp and Liner for about .30 a square ft and larger ones are even less. You might be able to salvage the pond for about 3K or so. Since you already have a bunch tied up in it maybe thats the way to go. I have to use a well pump to keep my pond from doing the same thing last summer I lost about 4 ft of water and the fish were swimming backwards to keep the mud out of their gills! This summer I am only down 11 inches.

Bob