Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central Chile

Research on microbiological groundwater quality was conducted in Chile in a rural watershed that has almost no other water source. Forty-two wells were randomly selected and levels of indicator bacteria - total coliforms (TC), fecal coliforms (FC), and fecal streptococci (FS) - were repeatedly measu...

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Autores principales:	Valenzuela,Mariela, Lagos,Bernardo, Claret,Marcelino, Mondaca,María A, Pérez,Claudio, Parra,Oscar
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2009
Materias:	biological contamination bacteria water quality environmental pollution
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000200013
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spelling	oai:scielo:S0718-583920090002000132018-10-01Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central ChileValenzuela,MarielaLagos,BernardoClaret,MarcelinoMondaca,María APérez,ClaudioParra,Oscar biological contamination bacteria water quality environmental pollution Research on microbiological groundwater quality was conducted in Chile in a rural watershed that has almost no other water source. Forty-two wells were randomly selected and levels of indicator bacteria - total coliforms (TC), fecal coliforms (FC), and fecal streptococci (FS) - were repeatedly measured during the four seasons of 2005. The aim of this study was to characterize microbiological groundwater quality, relate indicator levels to certain watershed features and management characteristics which are likely to affect water quality. The dynamics of seasonal temporal contamination was determined with statistical analyses of indicator organism concentrations. Nonparametric tests were used to analyze relationships between bacterial indicators in well water and other variables. TC, FC, and FS were found in all samples indicating the wells had been contaminated with human and animal fecal material. The frequency distribution of microorganisms fitted a logistic distribution. The concentrations appeared to be temporal and levels varied between seasons with higher concentrations in winter. The cause of contamination could be linked to the easy access of domestic animals to the wells and to the permeable well casing material. Local precipitation runoff directly influenced the bacterial concentrations found in the wells.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.69 n.2 20092009-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000200013en10.4067/S0718-58392009000200013
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	biological contamination bacteria water quality environmental pollution
spellingShingle	biological contamination bacteria water quality environmental pollution Valenzuela,Mariela Lagos,Bernardo Claret,Marcelino Mondaca,María A Pérez,Claudio Parra,Oscar Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central Chile
description	Research on microbiological groundwater quality was conducted in Chile in a rural watershed that has almost no other water source. Forty-two wells were randomly selected and levels of indicator bacteria - total coliforms (TC), fecal coliforms (FC), and fecal streptococci (FS) - were repeatedly measured during the four seasons of 2005. The aim of this study was to characterize microbiological groundwater quality, relate indicator levels to certain watershed features and management characteristics which are likely to affect water quality. The dynamics of seasonal temporal contamination was determined with statistical analyses of indicator organism concentrations. Nonparametric tests were used to analyze relationships between bacterial indicators in well water and other variables. TC, FC, and FS were found in all samples indicating the wells had been contaminated with human and animal fecal material. The frequency distribution of microorganisms fitted a logistic distribution. The concentrations appeared to be temporal and levels varied between seasons with higher concentrations in winter. The cause of contamination could be linked to the easy access of domestic animals to the wells and to the permeable well casing material. Local precipitation runoff directly influenced the bacterial concentrations found in the wells.
author	Valenzuela,Mariela Lagos,Bernardo Claret,Marcelino Mondaca,María A Pérez,Claudio Parra,Oscar
author_facet	Valenzuela,Mariela Lagos,Bernardo Claret,Marcelino Mondaca,María A Pérez,Claudio Parra,Oscar
author_sort	Valenzuela,Mariela
title	Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central Chile
title_short	Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central Chile
title_full	Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central Chile
title_fullStr	Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central Chile
title_full_unstemmed	Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central Chile
title_sort	fecal contamination of groundwater in a small rural dryland watershed in central chile
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000200013
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Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central Chile

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