I don't think you will be able to keep the muck in suspension long enough for it to wash out of the pond. Then as was said, washing all that much downstream might cause problems downstream. You'd need a whole bunch of water flowing thru the pond to do that.

Plus if you have any underwater plants that would cause issues getting it all stirred up.

If it's stirred up enough it most likely would clog the fishes gills.

In my situation with that particular pond, bringing in any type of heavy equipment would have compacted soil near the trees (killing them over the next 2-5 years) and would have tore up too much landscaping for it to work. Pumping out to a dewatering bag was the only way.

Don't forget, there isn't just muck on the bottom of the pond. You will find branches, wood, etc. there too that you never thought would be in the pond.

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