3D geometric model of the Dogger aquifer in the Paris Basin, developed for reporting purposes (2012). © BRGM - Sunseare Gabalda

DUPLOS and DIALOG: digital tools connected to the subsurface database

The aim of these tools is to provide a single centralised system for sending technical data relating to future boreholes, underground structures or excavation work to those involved in the declaration process (owners, prime contractors, operators, engineering consultancies and drilling companies). The DUPLOS portal is a web application for online declaration of underground works (whatever the legal framework), while the DiaLog application is for entering and saving a technical description of the works. Both applications are linked to the subsurface database (BSS) via a web-based registration service.

Example of a standard cross-section generated in the DIALOG tool using web services from the GDM suite (2019). @ BRGM

The need

In various cases requiring official declarations (mining code declaration,”Installation, Structures, Work and Activity” [IOTA], Classified Installations for the Protection of the Environment [ICPE], etc.), it is the responsibility of the decentralised departments (DREAL and DDT(M)) to send BRGM the technical information relating to the structures being built. These data are then entered and stored by BRGM in the BSS and made available via the InfoTerre website, in accordance with publication deadlines. However, this declaration process may be hampered by a lack of knowledge of legal provisions, by a break in the transmission chain from the citizen to the regional directorate for the environment, spatial planning and housing (DREAL), and then to the BRGM regional branch, or by the impossibility of completing the BSS file due to a lack of information (for example, an ambiguous geographical location). 

The results

The implementation of the DUPLOS and DIALOG tools aims to increase the number of declarations sent to departments responsible for authorising structures covered by the mining code, the water Act, or which are monitored classified installations or domestic boreholes requiring authorisation. Thus, the project provides a single means for on-line declaration of technical data (end of work reports, declaration dossiers) and for optimising the flow of information between the registrant / the authorising departments / BRGM.

In the medium term, BRGM's teams are also expected to save time in entering and re-entering data in BSS, thus improving the standardisation of the data transmitted.

Using the results

The DUPLOS (Unified Declaration for Underground Structures) web tool is accessible online for anyone who has to make a declaration under the mining code or water Act. The process is simple and allows users to make their declarations and notify the relevant government department for the type of declaration. At the end of the process, a BSS identifier is attached to each structure in the declaration, allowing its unique identification over time. Included in the DUPLOS portal, the DIALOG tool allows the project owner to fill in all the technical specifications of the structures and to generate technical cross-sections on request, as well as a report at the end of the work with all the data transmitted in the requisite format. In addition, the connection of these tools to Application Programming Interfaces (APIs) linked to repositories (BDLISA hydrogeological repository, regulatory protection zone, SIRET) and to BRGM registers (lithology, lithostratigraphy, etc.) enables the data entered to be structured and linked to high value-added technical data, automatically stored in the BRGM information system. To date, the prototype has been tested by government departments and could soon enter a production phase in a pilot-test region.


"The value of DUPLOS/DiaLog identified during the acceptance phase is that it enables the drilling company/prime contractor to provide a technical cross-section as soon as the application for consent for the structure is submitted (provisional cross-section), which will help speed up the work of the appraisal and authorisation departments".

Jean-Pierre Piquemal, head of the Water Department, borehole authorisation service at DDT 37

Flowchart of DUPLOS-DIALOG sequence of operations (2019). 


  • MTE (project initiated with the help of the "digital transition and modernisation of public affairs" fund for investments for the future, DILNUF, 2015".
  • Pilot Government Departments involved in the project: DDT37, DDT45, DDT36, DREAL Centre-Val de Loire and DREAL Normandie
  • SFEG, drilling companies and engineering design offices that contributed to the tests: EDREE, Eau & Industrie, Ginger Groupe, Antea Group, Massé drilling company, Hydrogeol, Hygeo, ExEau, SUEZ.
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