{ "layers": [ { "currentVersion": 11.3, "cimVersion": "3.3.0", "id": 0, "name": "LCE_HYB_DC_METAUX", "type": "Feature Layer", "description": "Cette couche contient les derniers résultats des stations évaluées à l'aide des métaux.\n\nL'appréciation de la qualité des cours d'eau à l'aide des métaux lourds se base sur les exigences chiffrées figurant dans l'annexe 2 de l'Ordonnance sur la protection des eaux (OEaux). La méthode d'appréciation est directement inspirée du système modulaire graduée dédié aux nutriments, elle juge si les seuils à atteindre pour satisfaire aux objectifs écologiques dans les eaux superficielles sont atteints.\n\nElle se détermine en mesurant la teneur dissoute de six métaux : cadmium (Cd), chrome (Cr), cuivre (Cu), nickel (Ni), plomb (Pb) et zinc (Zn).\n \nLa catégorisation de la valeur annuelle, calculée à partir des concentrations mesurées, se distingue en 5 classes de qualité de très bonne à mauvaise.\n\nPour chaque station, une appréciation générale de la qualité vis-à-vis des métaux est déterminée d'après le principe de l'élément déclassant.\n\nValeur Cadmium (µg/L):\n< 0,025➜ Très bon état\n[0.025 - 0.050[ ➜ Bon état\n[0.050 - 0.075[ ➜ Etat moyen\n[0.075 - 0.100[ ➜ Etat médiocre\n≥ 0.100 ➜ Etat mauvais\n\nValeur Chrome (µg/L):\n< 1.00➜ Très bon état\n[1.00 : 2.00[ ➜ Bon état\n[2.00 - 3.00[ ➜ Etat moyen\n[3.00 - 4.00[ ➜ Etat médiocre\n≥ 4.00 ➜ Etat mauvais\n\nValeur 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