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<gco:CharacterString>Cette couche de données reprend la délimitation géographique des bassins versants hydrographiques des masses d'eau de surface considérées par la Directive-Cadre Eau et son application en Wallonie.
La masse d'eau au sens large est un concept introduit par la Directive-cadre européenne sur l'Eau (DCE - Directive 2000/60/CE). Il s'agit de l'unité élémentaire pour caractériser le milieu aquatique. Cette notion est mieux adaptée à la gestion des ressources en eau à l'intérieur des bassins hydrographiques à large échelle (Districts hydrographiques internationaux). Chaque District possède un Plan de Gestion de District Hydrographique (PGDH). La masse d'eau de surface est définie par la DCE comme "une partie distincte et significative des eaux de surface telles un lac, un réservoir, une rivière, un fleuve ou un canal, une partie de rivière, de fleuve ou de canal, une eau de transition ou une portion d'eaux côtières". De ce fait, la masse d'eau de surface correspond à une unité de gestion des ressources en eau. Ces masses d'eau appartiennent à des bassins versants aux caractéristiques uniformes qui constituent l'unité territoriale de suivi des objectifs et de rapportage au niveau wallon et européen. Chaque bassin versant des MESU est donc affecté par les objectifs d'atteinte d'un bon état environnemental défini par la DCE.
La présente couche de données correspond à la délimitation de ces bassins versants. L'ensemble de la Wallonie est couverte par 390 bassins versants :
- 352 bassins versants correspondent aux masses d'eau de surface définies en Wallonie. Ils sont totalement inclus dans le territoire wallon ou se situent à cheval sur une frontière. Ils disposent d'un identifiant reprenant le bassin hydrographique du plan de gestion ( 2 premières lettres) + un numéro d'ordre (2 chiffres) + le type de BV MESU (R = Rivière, C = Canal, L = Réservoir.). Ces bassins versants font l'objet de fiche caractéristique individuelle; - 38 bassins versants hydrographiques correspondent aux parties de territoire wallon qui n’ont pas été identifiées comme masse d’eau (soit qu'il n'y a pas de cours d’eau, soit ce cours d’eau est inférieur à 10 km²) Ils sont cartographiés dans la couche de données mais ne disposent pas des attributs caractéristiques.
Attention, le terme "masse d'eau de surface" est couramment utilisé pour évoquer l'unité de bassin versant.</gco:CharacterString>
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<gmd:descriptiveKeywords>
<gmd:MD_Keywords>
<gmd:keyword>
<gmx:Anchor xlink:href="http://inspire.ec.europa.eu/metadata-codelist/SpatialScope/regional">Régional</gmx:Anchor>
</gmd:keyword>
<gmd:type>
<gmd:MD_KeywordTypeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_KeywordTypeCode" codeListValue="theme"/>
</gmd:type>
<gmd:thesaurusName>
<gmd:CI_Citation>
<gmd:title>
<gmx:Anchor xlink:href="http://inspire.ec.europa.eu/metadata-codelist/SpatialScope">Champ géographique</gmx:Anchor>
</gmd:title>
<gmd:date>
<gmd:CI_Date>
<gmd:date>
<gco:Date>2019-05-22</gco:Date>
</gmd:date>
<gmd:dateType>
<gmd:CI_DateTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_DateTypeCode" codeListValue="publication">publication</gmd:CI_DateTypeCode>
</gmd:dateType>
</gmd:CI_Date>
</gmd:date>
<gmd:identifier>
<gmd:MD_Identifier>
<gmd:code>
<gmx:Anchor xlink:href="https://metawal.wallonie.be/geonetwork/srv/api/registries/vocabularies/external.theme.httpinspireeceuropaeumetadatacodelistSpatialScope-SpatialScope">geonetwork.thesaurus.external.theme.httpinspireeceuropaeumetadatacodelistSpatialScope-SpatialScope</gmx:Anchor>
</gmd:code>
</gmd:MD_Identifier>
</gmd:identifier>
</gmd:CI_Citation>
</gmd:thesaurusName>
</gmd:MD_Keywords>
</gmd:descriptiveKeywords>
<gmd:resourceConstraints>
<gmd:MD_LegalConstraints>
<gmd:accessConstraints>
<gmd:MD_RestrictionCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_RestrictionCode" codeListValue="otherRestrictions"/>
</gmd:accessConstraints>
<gmd:otherConstraints>
<gmx:Anchor xlink:href="http://inspire.ec.europa.eu/metadata-codelist/LimitationsOnPublicAccess/noLimitations">No limitations to public access</gmx:Anchor>
</gmd:otherConstraints>
</gmd:MD_LegalConstraints>
</gmd:resourceConstraints>
<gmd:resourceConstraints>
<gmd:MD_LegalConstraints>
<gmd:useLimitation>
<gco:CharacterString>Conditions d'accès et d'utilisation spécifiques</gco:CharacterString>
</gmd:useLimitation>
<gmd:useConstraints>
<gmd:MD_RestrictionCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_RestrictionCode" codeListValue="otherRestrictions"/>
</gmd:useConstraints>
<gmd:otherConstraints>
<gmx:Anchor xlink:href="https://geoportail.wallonie.be/files/documents/ConditionsSPW/DataSPW-CGU.pdf">Les conditions générales d'utilisation s'appliquent.</gmx:Anchor>
</gmd:otherConstraints>
<gmd:otherConstraints>
<gmx:Anchor xlink:href="https://geoportail.wallonie.be/files/documents/ConditionsSPW/DataSPW-CGA.pdf">Les conditions générales d'accès s’appliquent.</gmx:Anchor>
</gmd:otherConstraints>
</gmd:MD_LegalConstraints>
</gmd:resourceConstraints>
<gmd:aggregationInfo>
<gmd:MD_AggregateInformation>
<gmd:aggregateDataSetIdentifier>
<gmd:MD_Identifier>
<gmd:code>
<gco:CharacterString>0ed95325-a1b0-48ca-8437-b63178c3eebe</gco:CharacterString>
</gmd:code>
</gmd:MD_Identifier>
</gmd:aggregateDataSetIdentifier>
<gmd:associationType>
<gmd:DS_AssociationTypeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#DS_AssociationTypeCode" codeListValue="partOfSeamlessDatabase"/>
</gmd:associationType>
<gmd:initiativeType>
<gmd:DS_InitiativeTypeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#DS_InitiativeTypeCode" codeListValue="collection"/>
</gmd:initiativeType>
</gmd:MD_AggregateInformation>
</gmd:aggregationInfo>
<gmd:spatialRepresentationType>
<gmd:MD_SpatialRepresentationTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_SpatialRepresentationTypeCode" codeListValue="vector">vector</gmd:MD_SpatialRepresentationTypeCode>
</gmd:spatialRepresentationType>
<gmd:spatialResolution>
<gmd:MD_Resolution>
<gmd:equivalentScale>
<gmd:MD_RepresentativeFraction>
<gmd:denominator>
<gco:Integer>100000</gco:Integer>
</gmd:denominator>
</gmd:MD_RepresentativeFraction>
</gmd:equivalentScale>
</gmd:MD_Resolution>
</gmd:spatialResolution>
<gmd:language>
<gmd:LanguageCode codeList="http://www.loc.gov/standards/iso639-2/" codeListValue="fre"/>
</gmd:language>
<gmd:characterSet>
<gmd:MD_CharacterSetCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_CharacterSetCode" codeListValue="utf8">utf8</gmd:MD_CharacterSetCode>
</gmd:characterSet>
<gmd:topicCategory>
<gmd:MD_TopicCategoryCode>inlandWaters</gmd:MD_TopicCategoryCode>
</gmd:topicCategory>
<gmd:topicCategory>
<gmd:MD_TopicCategoryCode>environment</gmd:MD_TopicCategoryCode>
</gmd:topicCategory>
<gmd:extent>
<gmd:EX_Extent>
<gmd:description>
<gco:CharacterString>Région wallonne</gco:CharacterString>
</gmd:description>
<gmd:geographicElement>
<gmd:EX_GeographicBoundingBox>
<gmd:westBoundLongitude>
<gco:Decimal>2.75</gco:Decimal>
</gmd:westBoundLongitude>
<gmd:eastBoundLongitude>
<gco:Decimal>6.49</gco:Decimal>
</gmd:eastBoundLongitude>
<gmd:southBoundLatitude>
<gco:Decimal>49.45</gco:Decimal>
</gmd:southBoundLatitude>
<gmd:northBoundLatitude>
<gco:Decimal>50.85</gco:Decimal>
</gmd:northBoundLatitude>
</gmd:EX_GeographicBoundingBox>
</gmd:geographicElement>
</gmd:EX_Extent>
</gmd:extent>
</gmd:MD_DataIdentification>
</gmd:identificationInfo>
<gmd:contentInfo>
<gmd:MD_FeatureCatalogueDescription>
<gmd:includedWithDataset>
<gco:Boolean>true</gco:Boolean>
</gmd:includedWithDataset>
<gmd:featureCatalogueCitation>
<gmd:CI_Citation>
<gmd:title>
<gco:CharacterString>Modèle de données</gco:CharacterString>
</gmd:title>
<gmd:date gco:nilReason="missing"/>
</gmd:CI_Citation>
</gmd:featureCatalogueCitation>
</gmd:MD_FeatureCatalogueDescription>
</gmd:contentInfo>
<gmd:distributionInfo>
<gmd:MD_Distribution>
<gmd:distributionFormat>
<gmd:MD_Format>
<gmd:name>
<gmx:Anchor xlink:href="http://inspire.ec.europa.eu/media-types/application/x-shapefile">ESRI Shapefile (.shp)</gmx:Anchor>
</gmd:name>
<gmd:version>
<gco:CharacterString>-</gco:CharacterString>
</gmd:version>
</gmd:MD_Format>
</gmd:distributionFormat>
<gmd:distributionFormat>
<gmd:MD_Format>
<gmd:name>
<gmx:Anchor xlink:href="http://inspire.ec.europa.eu/media-types/application/x-filegdb">ESRI File Geodatabase (.fgdb)</gmx:Anchor>
</gmd:name>
<gmd:version>
<gco:CharacterString>10.x</gco:CharacterString>
</gmd:version>
</gmd:MD_Format>
</gmd:distributionFormat>
<gmd:distributor>
<gmd:MD_Distributor>
<gmd:distributorContact>
<gmd:CI_ResponsibleParty>
<gmd:organisationName>
<gco:CharacterString>Service public de Wallonie (SPW)</gco:CharacterString>
</gmd:organisationName>
<gmd:contactInfo>
<gmd:CI_Contact>
<gmd:address>
<gmd:CI_Address>
<gmd:electronicMailAddress>
<gco:CharacterString>helpdesk.carto@spw.wallonie.be</gco:CharacterString>
</gmd:electronicMailAddress>
</gmd:CI_Address>
</gmd:address>
</gmd:CI_Contact>
</gmd:contactInfo>
<gmd:role>
<gmd:CI_RoleCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_RoleCode" codeListValue="distributor">distributor</gmd:CI_RoleCode>
</gmd:role>
</gmd:CI_ResponsibleParty>
</gmd:distributorContact>
<gmd:distributionOrderProcess>
<gmd:MD_StandardOrderProcess>
<gmd:orderingInstructions>
<gco:CharacterString>Cette couche de données fait partie d'une série de couches. En commandant cette couche, l'ensemble de la série vous sera automatiquement fournie.
L’utilisation des géoservices est à privilégier. Les instructions pour obtenir une copie physique d’une donnée sont détaillées sur https://geoportail.wallonie.be/telecharger.</gco:CharacterString>
</gmd:orderingInstructions>
</gmd:MD_StandardOrderProcess>
</gmd:distributionOrderProcess>
</gmd:MD_Distributor>
</gmd:distributor>
<gmd:transferOptions>
<gmd:MD_DigitalTransferOptions>
<gmd:onLine>
<gmd:CI_OnlineResource>
<gmd:linkage>
<gmd:URL>http://environnement.wallonie.be/cartosig/Inventaire_Donnees/Modeles_SIG3/MESU.pdf</gmd:URL>
</gmd:linkage>
<gmd:protocol>
<gco:CharacterString>WWW:LINK-1.0-http--link</gco:CharacterString>
</gmd:protocol>
<gmd:name>
<gco:CharacterString>Modèle de données</gco:CharacterString>
</gmd:name>
<gmd:description>
<gco:CharacterString>Modèle de données (document pdf)</gco:CharacterString>
</gmd:description>
<gmd:function>
<gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information.content"/>
</gmd:function>
</gmd:CI_OnlineResource>
</gmd:onLine>
<gmd:onLine>
<gmd:CI_OnlineResource>
<gmd:linkage>
<gmd:URL>https://geoservices.wallonie.be/arcgis/rest/services/EAU/MESU/MapServer/legend</gmd:URL>
</gmd:linkage>
<gmd:protocol>
<gco:CharacterString>WWW:LINK-1.0-http--link</gco:CharacterString>
</gmd:protocol>
<gmd:name>
<gco:CharacterString>Légende des couches de données</gco:CharacterString>
</gmd:name>
<gmd:description>
<gco:CharacterString>Légende des couches de données</gco:CharacterString>
</gmd:description>
<gmd:function>
<gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information.portrayal"/>
</gmd:function>
</gmd:CI_OnlineResource>
</gmd:onLine>
<gmd:onLine>
<gmd:CI_OnlineResource>
<gmd:linkage>
<gmd:URL>http://geoapps.wallonie.be/Cigale/Public</gmd:URL>
</gmd:linkage>
<gmd:protocol>
<gco:CharacterString>WWW:LINK</gco:CharacterString>
</gmd:protocol>
<gmd:name>
<gco:CharacterString>Vue générale sur l'environnement (CIGALE) - Application</gco:CharacterString>
</gmd:name>
<gmd:description>
<gco:CharacterString>Application de consultation des principales données cartographiques de la DGO3</gco:CharacterString>
</gmd:description>
<gmd:function>
<gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#CI_OnLineFunctionCode" codeListValue="browsing"/>
</gmd:function>
</gmd:CI_OnlineResource>
</gmd:onLine>
<gmd:onLine>
<gmd:CI_OnlineResource>
<gmd:linkage>
<gmd:URL>https://geoportail.wallonie.be/walonmap/#ADU=https://geoservices.wallonie.be/arcgis/rest/services/EAU/MESU/MapServer%7c%7c%5b1%5d</gmd:URL>
</gmd:linkage>
<gmd:protocol>
<gco:CharacterString>WWW:LINK</gco:CharacterString>
</gmd:protocol>
<gmd:name>
<gco:CharacterString>Application WalOnMap - Toute la Wallonie à la carte</gco:CharacterString>
</gmd:name>
<gmd:description>
<gco:CharacterString>Application cartographique du Geoportail (WalOnMap) qui permet de découvrir les données géographiques de la Wallonie.</gco:CharacterString>
</gmd:description>
<gmd:function>
<gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#CI_OnLineFunctionCode" codeListValue="information"/>
</gmd:function>
</gmd:CI_OnlineResource>
</gmd:onLine>
<gmd:onLine>
<gmd:CI_OnlineResource>
<gmd:linkage>
<gmd:URL>https://geoportail.wallonie.be/walonmap/#ADU=https://geoservices.wallonie.be/arcgis/rest/services/EAU/MESU/MapServer/1</gmd:URL>
</gmd:linkage>
<gmd:protocol>
<gco:CharacterString>ESRI:REST</gco:CharacterString>
</gmd:protocol>
<gmd:name>
<gco:CharacterString>Service de visualisation ESRI-REST</gco:CharacterString>
</gmd:name>
<gmd:description>
<gco:CharacterString>Adresse de connexion au service de visualisation ESRI-REST des couches de données relatives aux Masses d'eau de surface (MESU)</gco:CharacterString>
</gmd:description>
<gmd:function>
<gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#CI_OnLineFunctionCode" codeListValue="information"/>
</gmd:function>
</gmd:CI_OnlineResource>
</gmd:onLine>
<gmd:onLine>
<gmd:CI_OnlineResource>
<gmd:linkage>
<gmd:URL>https://geoservices.wallonie.be/arcgis/services/EAU/MESU/MapServer/WMSServer?request=GetCapabilities&amp;service=WMS</gmd:URL>
</gmd:linkage>
<gmd:protocol>
<gco:CharacterString>OGC:WMS</gco:CharacterString>
</gmd:protocol>
<gmd:name>
<gco:CharacterString>Service de visualisation WMS</gco:CharacterString>
</gmd:name>
<gmd:description>
<gco:CharacterString>Adresse de connexion au service de visualisation WMS des couches de données relatives aux Masses d'eau de surface (MESU)</gco:CharacterString>
</gmd:description>
<gmd:function>
<gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#CI_OnLineFunctionCode" codeListValue="information"/>
</gmd:function>
</gmd:CI_OnlineResource>
</gmd:onLine>
</gmd:MD_DigitalTransferOptions>
</gmd:transferOptions>
</gmd:MD_Distribution>
</gmd:distributionInfo>
<gmd:dataQualityInfo>
<gmd:DQ_DataQuality>
<gmd:scope>
<gmd:DQ_Scope>
<gmd:level>
<gmd:MD_ScopeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_ScopeCode" codeListValue="dataset"/>
</gmd:level>
</gmd:DQ_Scope>
</gmd:scope>
<gmd:report>
<gmd:DQ_DomainConsistency>
<gmd:evaluationProcedure/>
<gmd:dateTime/>
<gmd:result>
<gmd:DQ_ConformanceResult>
<gmd:specification xlink:href="http://inspire.ec.europa.eu/id/citation/ir/reg-1089-2010">
<gmd:CI_Citation>
<gmd:title>
<gmx:Anchor xlink:href="http://data.europa.eu/eli/reg/2010/1089">RÈGLEMENT (UE) N o 1089/2010 DE LA COMMISSION du 23 novembre 2010 portant modalités d'application de la directive 2007/2/CE du Parlement européen et du Conseil en ce qui concerne l'interopérabilité des séries et des services de données géographiques</gmx:Anchor>
</gmd:title>
<gmd:date>
<gmd:CI_Date>
<gmd:date>
<gco:Date>2010-12-08</gco:Date>
</gmd:date>
<gmd:dateType>
<gmd:CI_DateTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_DateTypeCode" codeListValue="publication">publication</gmd:CI_DateTypeCode>
</gmd:dateType>
</gmd:CI_Date>
</gmd:date>
</gmd:CI_Citation>
</gmd:specification>
<gmd:explanation>
<gco:CharacterString>Voir la spécification référencée</gco:CharacterString>
</gmd:explanation>
<gmd:pass>
<gco:Boolean>false</gco:Boolean>
</gmd:pass>
</gmd:DQ_ConformanceResult>
</gmd:result>
</gmd:DQ_DomainConsistency>
</gmd:report>
<gmd:lineage>
<gmd:LI_Lineage>
<gmd:statement>
<gco:CharacterString>Les bassins versants des masses d'eau de surface sont obtenus par agrégation des bassins versants élémentaires. Ceux-ci sont calculés à partir du modèle numérique de terrain ERRUISSOL.
Grâce à une méthodologie mise en place précédemment (Actualisation des limites des bassins versants en Région wallonne) et à l'utilisation des outils "Hydrology" d'Arcgis, il a été possible pour les 352 bassins versants de déterminer les aires à l'intérieur desquelles toutes les eaux tombées alimentent une même limite aval.</gco:CharacterString>
</gmd:statement>
</gmd:LI_Lineage>
</gmd:lineage>
</gmd:DQ_DataQuality>
</gmd:dataQualityInfo>
<gmd:portrayalCatalogueInfo>
<gmd:MD_PortrayalCatalogueReference>
<gmd:portrayalCatalogueCitation>
<gmd:CI_Citation>
<gmd:title>
<gco:CharacterString>Légende des couches de données</gco:CharacterString>
</gmd:title>
<gmd:date gco:nilReason="missing"/>
</gmd:CI_Citation>
</gmd:portrayalCatalogueCitation>
</gmd:MD_PortrayalCatalogueReference>
</gmd:portrayalCatalogueInfo>
</gmd:MD_Metadata>
</csw:GetRecordByIdResponse>
