Water
Which pipes to renew first?
Renewing too early spends money for no gain. Renewing too late is paid in leaks, outages and emergency works.
France, Belgium, Switzerland, Luxembourg.
Age, material, break history, sensitivity of the users: the data often already exists, in separate files. Once they sit on the same map, they give a ranked programme.
The same reading applies to surveys. Where the precision class is missing, and where works are coming, is where the next survey budget should go.
Renewal
A rank you can explain, not a rule of thumb on age alone.
Deliverables
Acceptance criteria written before the contractor delivers. An anomaly report you can stand behind.
End of contract
At the end of a concession, the authority takes the assets and the data back. Completeness is a decision prepared in advance.
Means. QGIS, PostGIS, automated checks.
Decision Diagnostic
A short fixed scope. We name what costs money or blocks the work, and the first action to take.