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BIM serving rainwater management

Depending on the planned location of a construction project, the work done by hydrogeologists on rainwater management can include determining the natural drainage basin and its potential impact on the project.

Unique, delimited by the watershed divide between two drainage basins, a drainage basin corresponds to the total surface area receiving the water circulating naturally towards the same watercourse or groundwater body.

Using the IGN's ALTI® data, our BIM teams have managed to  model the information to be able to analyse the water runoff flows, determine the area of the drainage basin and its impact on the project.

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Tools used

Several processing operations carried out on the RGE ALTI® data accessible on the IGN site will allow the relevant data to be imported  into our modelling tool in order to generate the digital elevation model.  

Once the DEM has been generated, several relief visualisation or analysis tools are used, which all contribute to determining the natural drainage basin:

  • Contour lines + elevations
  • DEM divided up according to the altitudes
  • Drawing showing slope arrows
  • Flow of a drop of water + C3D
  • Length profile
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Determination of the drainage basin

The identification of drainage basins is based on the analysis of directions of flow on triangulated surfaces, coupled with the dynamic analysis.

The analysis work allows us to determine:

  • the water flows,
  • the watershed divides
  • in fine, the area of the natural drainage basin.