1/8" per foot
1/8 th -3/4 in per ft
1/8" per foot
you need to know the PITCH of the drain line to give an proper answer
1/4 inch per foot.
That would depend on PITCH more pitch more fixtures allowed
Most of the time it is 4 inch.
The building code where I live requires a drain pipe to slope approximately 1/4 inch per foot (+ or - 1/8 inch). The recommended pitch for a 50 foot drain would be 12-1/2 inches.
Wouldn't recommend it as things may back up in the drain line. 4" line is the norm ... you want to get rid of waste, not keep it around longer.
Ideally 1/4" per foot minimum
The length of a 4-inch line is 4-inches.
The maximum number of drainage fixture units (DFUs) allowed on a 4-inch diameter drain line typically depends on local plumbing codes and the specific type of fixtures being used. Generally, a 4-inch drain line can handle around 24 DFUs. However, for precise calculations and compliance, it is essential to consult the local plumbing code or the plumbing code applicable in your area.
1/4" per foot