I used an above ground pool with an outlet at the bottom and pumped in at the top. I would dredge with a3" semi trash pump I would fill the pool then let it settle then siphon the clear water back to the pond then I would open the lower drain and dump the muck to an area where it would dry out. Then repeat. My pond is one acre and thirty feet deep it had about seven feet of muck. It was a lot of work but with your situation it would be very feasible
