HAGDMS has now been replaced

Geotechnical data

National Highways' geotechnical data has been moved to the Geotechnical & Drainage Management Service (GDMS). This includes geotechnical asset and event data, archives of geotechnical reports and AGS datasets, and the latest available maps.

GDMS web address: https://gdms.assetia.cloud/


HAGDMS login details will not work on GDMS. All new GDMS users including National Highways staff require approval, which should be requested from one of the following:

  • a National Highways Geotechnical Advisor
  • a Geotechnical Maintenance Liaison Engineer

Drainage data

National Highways' drainage data is maintained in HADDMS. This includes all drainage and flooding related data.

HADDMS web address: https://www.haddms.co.uk/


All support enquiries should be directed to: support@hagdms.com