Convert pipe length and slope into vertical fall and a downstream invert depth.
Use horizontal plan length, not the sloped pipe length.
Confirm the required slope for the pipe and local rules.
Vertical depth from the chosen datum to the inside bottom of the pipe.
Vertical fall
300mm
Downstream invert depth
0.90m
A constant straight grade measured along the horizontal route. Fittings, bedding, wall penetrations, settlement, minimum cover and actual survey tolerances are excluded.