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Plumber
Pipe Fall
Fall over a run for a given grade (1:X).
AS/NZS 3500 commonly 1:60 for DN100+, 1:40 for smaller.
Total fall
100 mm
Fall0.1 m
Gradient1 : 60
Formula
fall = length / grade
6 / 60 = 0.1 m
Guide only. AS/NZS 3500 common minimum grades are about 1:60 for DN100 and larger, and 1:40 for smaller drains. Confirm for your job.