Soil Pipe

New bathroom entails digging soil pipe some 20yds in to Septic Tank. Can anyone tell me what the fall should be?
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John Horne wrote:

Min of 1/50, pref 1/40.
--
Grunff

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Can
I think it's 1:40, so 1/2 yrd or 18 inches.
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John Horne wrote:

1:100 minimum, 1:60 preferred AFAICR.
Make sure its dead straight and pack all arond with gravel.
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