Downloads

This site provides downloadable software and documents related to management of National Highways geotechnical and drainage assets. Please read the terms and conditions below before proceeding to download any files.

Further GDMS support is available at: https://help.gdms.assetia.cloud/

Terms and conditions

Downloadable files on the Geotechnical & Drainage Management Service (GDMS) Downloads web site are provided free of charge for use on behalf of National Highways only. Any other use is not permitted. You may not provide any of these files for download on any other web site or link directly to any individual files. Files may be periodically updated and you are responsible for checking you have the latest version of any file you use. Some files may be subject to further licence terms which will be shown during installation if applicable.

This web site and material relating to Government information, products and services (or to third party information, products and services), is provided 'as is', without any representation or endorsement made and without warranty of any kind whether express or implied, including but not limited to the implied warranties of satisfactory quality, fitness for a particular purpose, non-infringement, compatibility, security and accuracy.

We do not warrant that the functions of this site or the material contained in this site will be uninterrupted or error free, that defects will be corrected, or that this site or the server that makes it available are free of viruses or represent the full functionality, accuracy, reliability of the materials. In no event will we be liable for any loss or damage including, without limitation, indirect or consequential loss or damage, or any loss or damages whatsoever arising from use or loss of use of, data or profits arising out of or regarding the use of this web site.

These Terms and Conditions shall be governed by and construed in accordance with the laws of England and Wales. Any dispute arising under these Terms and Conditions shall be subject to the exclusive jurisdiction of the courts of England and Wales.

Please only proceed to download files if you agree with the above.

Downloadable files

General

  Title Published Size (format) Link
folder_zip GDMS API documentation (draft) rev02f Oct 2024 <1MB (ZIP) Download
folder_zip PDF Toolkit 2.1.0.1 including user manual and tutorials 8 May 2019 32MB (ZIP) Download

Geotechnical

  Title Published Size (format) Link
assessment Geotechnical Properties Compendium v2 Dec 2023 14MB (XLSX) Download
picture_as_pdf Handover of geotechnical as-built information (May 2023) May 2023 <1MB (PDF) Download
folder_zip TabletGAD 1.2.2 (please contact GDMS support for installation guidance) 21 Oct 2022 276MB (ZIP) Download

Drainage

  Title Published Size (format) Link
folder_zip Culvert User Guides and Worksheets ISSUE 1 Oct 2010 <1MB (ZIP) Download
picture_as_pdf Flood Severity Index calculation method rev 9a May 2016 <1MB (PDF) Download
assessment GDMS drainage data formats v1.1 13 Nov 2024 <1MB (XLSX) Download
folder_zip GDMS drainage data formats SHP file template v1 Oct 2024 <1MB (ZIP) Download
folder_zip HA219 Sedimentation Predictor v7.0 Nov 2009 <1MB (ZIP) Download
folder_zip LA113 HE Water Risk Assessment Tool (HEWRAT) spreadsheet and help guide v2.0.4 Jun 2019 10.6MB (ZIP) Download
picture_as_pdf MCHW Drainage Survey Method of Measurement (June 2019) Jun 2019 <1MB (PDF) Download
picture_as_pdf Priority Outfalls User Guide ISSUE 1 Oct 2010 <1MB (PDF) Download
picture_as_pdf RIS2 Drainage Resilience Metric Issue 3 Apr 2024 <1MB (PDF) Download
ondemand_video RIS2 Drainage Resilience Metric 2021 training webinars recordings Feb 2021 video stream Watch Online
picture_as_pdf RIS2 Drainage Resilience Metric 2021 training webinars slides and FAQs (combined PDF) rev02 Apr 2021 4MB (PDF) Download
picture_as_pdf Spill Severity Index calculation method rev 1b Feb 2012 <1MB (PDF) Download
folder_zip Soakaway User Guides and Worksheets ISSUE 1 Oct 2010 <1MB (ZIP) Download

Guidance

  Title Published Size (format) Link
picture_as_pdf Guidance Note on the Field Identification and Classification of Geotechnical Observations V2.0 Nov 2015 17MB (PDF) Download
picture_as_pdf HAGDMS Slope Hazard Rating data description v2 Aug 2017 <1MB (PDF) Download
picture_as_pdf Hazard guidance note: Aggressive/corrosive soil and groundwater v2.2 Apr 2020 <1MB (PDF) Download
picture_as_pdf Hazard guidance note: Brine extraction v2.1 Jun 2017 <1MB (PDF) Download
picture_as_pdf Hazard guidance note: Coal mining v6.0 Nov 2023 2MB (PDF) Download
picture_as_pdf Hazard guidance note: Compressible/collapsible ground v2.1 Jun 2017 <1MB (PDF) Download
picture_as_pdf Hazard guidance note: Dissolution features v2.1 Jun 2017 <1MB (PDF) Download
picture_as_pdf Hazard guidance note: Engineered rock slopes v2.1 Jun 2017 <1MB (PDF) Download
picture_as_pdf Hazard guidance note: Engineered soil slopes v2.1 Jun 2017 <1MB (PDF) Download
picture_as_pdf Hazard guidance note: Groundwater flooding v2.1 Jun 2017 <1MB (PDF) Download
picture_as_pdf Hazard guidance note: Landfill sites v2.1 Jun 2017 <1MB (PDF) Download
picture_as_pdf Hazard guidance note: Natural landslides v2.1 Jun 2017 1MB (PDF) Download
picture_as_pdf Hazard guidance note: Non-coal mining v2.1 Jun 2017 <1MB (PDF) Download
picture_as_pdf Hazard guidance note: Shrink/swell susceptible soils v2.4 Apr 2020 <1MB (PDF) Download
picture_as_pdf Implementation guidance on geological codification within AGS files submitted to National Highways v5b Nov 2022 1MB (PDF) Download