My understanding is to not exceed the 1/4/foot. The low flush
toilets just don't have the volume to clean the lines and excess
pitch just tends to leave solids. You would not change grade with
a 90 down, but rather, two 45's.
Keep the whole world singing . . . .
Your thinking about the low slope and moving solids in a sanitary sewer is
on track, however , it's acceptable to go up to a 12% slope. If that will
not accommodate the needed grade change, a vertical drop is required, such
as a drop manhole or a tee/wyes with a clean out. Clean outs should be
provided every 75' and at every change in direction.
Keep the world flowing ;-)
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