We hang panels from a cable on the water gaps. When the creeks rise, the panels will just swing with the current. If they get too high, we have to go re-tie them. the trick is to tie them securely to the cable and loosely to each other. That way if a large branch or tree comes floating down, it doesn't take the fence with it. It will break the ties between the panels, but they would still be attached to the cable overhead. We have only had to replace one or two panels over the last 10 years this way.
edit..we don't have a high fence, but I guess you can do the same thing for a high fence by doubling up the panels
[This message has been edited by Ted Logan (edited 11/17/2009 4:57p).]