Looking for information on trompes

Hi,

<<Not sure this is the correct forum - I figure that this is the best place for a "wooly" question.

I am looking for any information I can get on Trompes - gravity assisted water "pumps" and/or gravity assisted aerators.

I understand the concept in general - looking for specific designs and mechanisms - for once google seems a bit lacking - I wonder if there are alternative names?

You have probably already seen the YouTube clip of Bill Mollison explaining at the blackboard what a trompe is, but just in case not:

Old School Version
http://www.sudburyminingsolutions.com/prof-aims-to-revive-ragged-chute-technology.html
"Plant supplied 29 or 30 mines, cost almost nothing to operate and had no moving parts"

"Since it was built in 1910, Ragged Chute practically ran itself"
http://cobalt.ca/ragged-chutes/