United States Geological survey water supply paper, 2307. Analysis and interpretation of water-quality trends in major U.S rivers, 1974-1981 / Smith, A. R.

Public ISBD Titre de série : United States Geological survey water supply paper, 2307 Titre : Analysis and interpretation of water-quality trends in major U.S rivers, 1974-1981 Type de document : texte imprimé Auteurs : Smith, A. R. ; Alexander, B. R. ; Gardon, W. M. Mention d'édition : USGPO Editeur : USGPO Année de publication : 1987 ISBN/ISSN/EAN : CI-04012 Note générale : Water quality records from two nationwide sampling networks are now of sufficient length to permit nationally consist analysis of long-term water-quality trends at more than 300 locations on major US rivers. Particularly noteworthy are widespread decreases in lead and fecal bacteria concentrations and widespread increases in nitrate, arsenic, and cadmium concentrations. There is evident that atmospheric deposition of a variety of substances has played a surprisingly large role in water-quality changes. Langues : Anglais (eng) Mots-clés : Qualité de l'eau  Analyse de l'eau  Hydrochimie  Réseau hydrographique  Hydraulique urbaine Index. décimale : 627 Génie hydraulique Résumé : Water quality records from two nationwide sampling networks are now of sufficient length to permit nationally consist analysis of long-term water-quality trends at more than 300 locations on major US rivers. Particularly noteworthy are widespread decreases in lead and fecal bacteria concentrations and widespread increases in nitrate, arsenic, and cadmium concentrations. There is evident that atmospheric deposition of a variety of substances has played a surprisingly large role in water-quality changes. Note de contenu : Water quality records from two nationwide sampling networks are now of sufficient length to permit nationally consist analysis of long-term water-quality trends at more than 300 locations on major US rivers. Particularly noteworthy are widespread decreases in lead and fecal bacteria concentrations and widespread increases in nitrate, arsenic, and cadmium concentrations. There is evident that atmospheric deposition of a variety of substances has played a surprisingly large role in water-quality changes. United States Geological survey water supply paper, 2307. Analysis and interpretation of water-quality trends in major U.S rivers, 1974-1981 [texte imprimé] / Smith, A. R. ; Alexander, B. R. ; Gardon, W. M.  . -  USGPO . - USGPO, 1987. ISSN : CI-04012 Water quality records from two nationwide sampling networks are now of sufficient length to permit nationally consist analysis of long-term water-quality trends at more than 300 locations on major US rivers. Particularly noteworthy are widespread decreases in lead and fecal bacteria concentrations and widespread increases in nitrate, arsenic, and cadmium concentrations. There is evident that atmospheric deposition of a variety of substances has played a surprisingly large role in water-quality changes. Langues : Anglais (eng) Mots-clés : Qualité de l'eau  Analyse de l'eau  Hydrochimie  Réseau hydrographique  Hydraulique urbaine Index. décimale : 627 Génie hydraulique Résumé : Water quality records from two nationwide sampling networks are now of sufficient length to permit nationally consist analysis of long-term water-quality trends at more than 300 locations on major US rivers. Particularly noteworthy are widespread decreases in lead and fecal bacteria concentrations and widespread increases in nitrate, arsenic, and cadmium concentrations. There is evident that atmospheric deposition of a variety of substances has played a surprisingly large role in water-quality changes. Note de contenu : Water quality records from two nationwide sampling networks are now of sufficient length to permit nationally consist analysis of long-term water-quality trends at more than 300 locations on major US rivers. Particularly noteworthy are widespread decreases in lead and fecal bacteria concentrations and widespread increases in nitrate, arsenic, and cadmium concentrations. There is evident that atmospheric deposition of a variety of substances has played a surprisingly large role in water-quality changes.

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