I have an idea for a pondless waterfall using an existing irrigation
system and I'd like to hear your reactions to it..... snip.

Sounds like a good plan.

You can join troll free groups at:

For aquariums & PONDS, many old time rec.ponders are he
http://groups.google.com/group/The-Freshwater-Aquarium

~ jan
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Also ponding troll free at:
http://groups.google.com/group/The-Freshwater-Aquarium