Hi Bob!
Your proposed pond sounds wonderful!
Most of us don't even come close to that size.
Until they can chime in I'll give you a few other references and hope you let
us know how it all goes! :-)

The following are great resources
for large ponds.
Earth Pond Sourcebook
by Tim Matson
and the newsgroup
misc.rural
and the ask the Pond Boss forum
http://www.pondboss.com/cgibin/ubbcgi/ultimatebb.cgi
and
A
HREF="http://www.aquaticecosystems.com/aquatic1v1/index.icl"http://www.aq
uaticecosystems.com/aquatic1v1/index.icl/A

good luck!
k30a