Pond liner is a must under the waterfall. Waterfalls are notorius for
leaking. The water will run around the rocks and over the edge of the
liner. Water will run under the rocks but on top of the liner, so you can't
see the water. Be sure and make a pronounced U shape for the stream and
have the edge of the liner high. Without a liner, the water would just go
through the rocks and into the soil.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html
"mark" wrote in message
om...
I am building a waterfall. Do I cover the hill with liner before
placing rocks? Any tips on how to do this and on placing rocks
appreciated as this is a first time project.