7.13 Chainages
A running 'as constructed' chainage of the entire pipeline must be annotated on the longitudinal section (with associated invert levels). Chainages should also be annotated on the Detail design alignment plan at any point where the chainage varies from design.
Chainages must be specifically taken at the following points:
- start and end of structures (including transitions) and manholes
- commencement and completion of works
- tangent points of curved pipelines
- all changes in vertical grade
- all changes in horizontal direction
- at all connecting pipes (inlets).
