Bentonite? I don't quite get how the banked soil works and how your pond is
lined such that a berm (if I understand correctly what you are saying) would
pull the water out of the pond. How much are you losing/day?
http://www.pondseal.com/
"redtag" wrote in message
news:1062577411.671448@sj-nntpcache-5...
I have installed a new wildlife pond, about 4m x 6m. I have banked soil
right the way into the pond as per most instructions for wildlife friendly
ponds and it all looks good.

However the way is now draining out of the pond due to capillary action
(or
wicking, as it is sometimes called). Although I have a lovely area of wet
soil all around my pond, I was hoping to keep some water inside the pond!

Any idea on how to cut down this effect?

Can I do something different with the liner to help prevent this? At the
moment I have this:

*****************soil
water * * ------pond liner
***** /
pond liner------- earth

Any ideas?