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Cet outil d'évaluation s'appuie sur différents éléments :- la définition préalable d'une typologie de référence des cours d'eau, permettant la comparaison de chaque cours d'eau à son type géomorphologique de référence;- une méthode de découpage en tronçons ou secteurs homogènes selon des critères géomorphologiques : territoire écologique (région naturelle), ordre de Strahler (taille du cours d'eau)lithologie (nature des sols) et anthropiques (occupation des sols, facteurs d'anthropisation, \u2026) ;- une fiche standardisée unique de description de 40 paramètres effectuée à partir de cartes mais surtout d'observations sur le terrain;- un traitement informatisé des données avec pondération des paramètres par analyse multicritère fournit un indice global propre à un secteur ainsi que trois sous-indices pour le lit majeur, les berges et le lit mineur. 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