Major drainage barriers are water-related structures that cause changes in surface water flow. They disrupt the flow of aquatic materials and species and ecological continuity.
A CER geostandard was established by the CNIG in 2018 for harmonisation (cer_obstacle)
[http://cnig.gouv.fr/wp-content/uploads/2018/10/181001_Standard_CNIG_CER_...](http://cnig.gouv.fr/wp-content/uploads/2018/10/181001_Standard_CNIG_CER_v2018.pdf)
This data is the fixed representation on the date of the vote of the SRADDET (approved by prefectoral decree on 4 August 2020)
Consider consulting the recommendations for use in resources
[https://sig.hautsdefrance.fr/ext/opendata/Sraddet2020/precisions_biodive...](https://sig.hautsdefrance.fr/ext/opendata/Sraddet2020/precisions_biodiversite.pdf)
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