Tell the owners to look into this book and these internet references.
(And find some way to stop the run off.)

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


k30a