Soil Pipe

[John Horne]

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

[Grunff]

Min of 1/50, pref 1/40.

[Neil Jones]

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

[The Natural Philosopher]

1:100 minimum, 1:60 preferred AFAICR.

Make sure its dead straight and pack all arond with gravel.