While I only ever had a few instances of a fish jumping out of a
preform (wifes 1/2 barrel) I certaily don;t want to have it happen
again if possible. They have not shown any signs of trying to jump
out since.

I am in the process of removing the small little preform that is by
the large pond and installing a large preform. I have just modified it
so it has a spillway lip, which is the same distance down as other
preforms (approx 1 1/4" from top edge)..

So how far from the top edge would you feel comfortable with on
filling a preform with fish in it?
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Opinions expressed are those of my wife,
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When we had a preform, I filled it almost to the top, and had no problems with
the fish jumping out. I would say it depends on the fish, if they are jumpers,
then they could jump out no matter how full you have the pond.
Jan
"Our Pond" Page
http://hometown.aol.com/pinkpggy/index.html

I keep mine filled to a couple of inches below the rim. I do have a few
inches of rocks piled around the edges also. No jumping problem ever.

My new pond 2004:

http://community-2.webtv.net/DBLBGY/doc/

Denise