From the chaotic regions of the Cryptosphere,
(grimmy) wrote on 31 Jul 2003 12:23:19 -0700:

Does anybody
know what the required angle of elevation is for the waste pipe of a
flush toilet?

The above-ground branch needs to have a fall between 18mm and 90mm per
metre run. The below ground drain needs to be no shallower than 1:40.
--
Hugo Nebula
"You know, I'd rather see this on TV,
Tones it down" - Laurie Anderson