Muffin,

sorry for your troubles. In my previous problem I had a similar
problem due to racoons tossing the lillies while fishing. Like you I
didn't have a bottom drain in the pond. I attached one of those tetra
retrofit bottom drains to a pump and sucked all the muck out that way.
Once I was finished, I attached the bottom drain to a piece of
flexible black PVC and installed it permanently in the pond. I still
had the Racoons but at least the bottom drain was in to pick up the
muck. The retrofit bottom drain is no where near as nice as a built
in bottom drain ( I have two in my new pond ) but if you can hide the
piping they work quite well.

Good luck,
Kevin