Drainage runs
| Run | Length (m) | Fall (1 in) | Pipe | Type | Fall (m) |
|---|
Runs chain end to end from the start invert level - each run's start level is the
previous run's end level. Fall is expressed as "1 in N" (a fall of 1m over N metres of
run) - larger N means a flatter, shallower fall.
0
Total length (m)
0
Total fall (m)
0
End level (m)
0
Shallow runs
Fall profile
Invert level vs cumulative chainage, to scale
Meets minimum fall
Shallower than recommended
Level schedule
| Run | Chainage from | Chainage to | Start level | End level | Fall |
|---|
A set-out schedule for the drainage run, chained from the start invert level entered on
the Runs tab - useful for checking against a drainage layout drawing or handing to
groundworkers on site.
Minimum fall, at a glance
| Pipe diameter | Min fall - foul | Min fall - surface water |
|---|
Approximate self-cleansing minimum fall figures, broadly following UK Building
Regulations Approved Document H guidance - always confirm against the current regulations
and your drainage engineer's design for the actual project. The 300mm surface water figure
in particular is an extrapolation, not a published table value - published guidance
recommends a full hydraulic design (catchment area and rainfall intensity) for surface
water pipes at and above 225mm rather than a simple ratio.