On Tue, 18 Sep 2007 00:15:13 -0400, "Tom Del Rosso"
wrote:

"Jim Thompson" wrote
in message

Yep. When I was scouting out universities while I was still in high
school there was a demonstration at the University of Cincinnati of a
sewer mechanism to handle low flow neighborhoods.... a cistern filled
up with sewage and water until it reached a certain critical level,
then flushed itself... no moving parts.

How did it retain and release the sewage with no moving parts?

Just like a toilet does when you exceed a certain water level in the
bowl.

...Jim Thompson
--
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