In order to verify the achievement of these objectives, the WFD requires the delimitation of water masses, which are the spatial unit of#x27; assessment of the water status. Mass catchment areas of DCE water are layers of work without validated reference status.
__Origin__
SIE Loire-Bretagne
__Partner organisations__
DREAL Pays de la Loire
__Links annexes__
* [basketDownloadFrontalParametrage](https://catalogue.sigloire.fr/geosource/panierDownloadFrontalParametrage?LAYERIDTS=33365139)
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/b28a0cdbbf507bbd08387dc7f5f49214a10aa59f)
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