oh yeah, i remember the rock ledge part. well if yer pond ends up not holding the way you want it to, the obvious other "creative" solution would be a liner, in a pond yer size it might work real good.

if that appeals to you, i would research liners and cost out a few companies to get a feel for it........also search old threads on the forum.

you might also contact a couple local geotech firms, they could point you in the right direction. those guys work with landfills and use "geotextile fabrics" all the time. they may even have spare rolls or lying around.

any others here who have used a liner....maybe help scruffy out?

GSF are people too!