"Jim Thompson" wrote
in message
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.

Ok, but a toilet only works if the level increases rapidly. If you let
water trickle into it slowly, then it just flows over the bend without
creating suction.


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