"Dave" wrote in message news:gAgNc.193650$Oq2.45073@attbi_s52...

I'd like to have a geyser (like yellowstone) and a sort of natural setting.

project somewhere between 6 and 15 feet tall (or so).

You will need a pump with almost 20 foot head pressure at a smallish
flow. Pond pumps usually go the other way, low pressure, high flow.
Sounds more like Geneva Switzerland than Yellowstone!
--
Crashj