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Monitoring of water quality from roof runoff: Interpretation using multivariate analysis

Vialle, Claire and Sablayrolles, Caroline and Lovera, Maurin and Jacob, Séverine and Huau, Marie-Christine and Vignoles-Montrejaud, Mireille Monitoring of water quality from roof runoff: Interpretation using multivariate analysis. (2011) Water Research, 45 (12). 3765-3775. ISSN 0043-1354

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Official URL: https://doi.org/10.1016/j.watres.2011.04.029


The quality of harvested rainwater used for toilet flushing in a private house in the south-west of France was assessed over a one-year period. Temperature, pH, conductivity, colour, turbidity, anions, cations, alkalinity, total hardness and total organic carbon were screened using standard analytical techniques. Total flora at 22°C and 36°C, total coliforms, Escherichia coli and enterococci were analysed. Overall, the collected rainwater had good physicochemical quality but did not meet the requirements for drinking water. The stored rainwater is characterised by low conductivity, hardness and alkalinity compared to mains water. Three widely used bacterial indicators - total coliforms, E. coli and enterococci - were detected in the majority of samples, indicating microbiological contamination of the water. To elucidate factors affecting the rainwater composition, principal component analysis and cluster analysis were applied to the complete data set of 50 observations. Chemical and microbiological parameters fluctuated during the course of the study, with the highest levels of microbiological contamination observed in roof runoffs collected during the summer. Escherichia coli and enterococci occurred simultaneously, and their presence was linked to precipitation. Runoff quality is also unpredictable because it is sensitive to the weather. Cluster analysis differentiated three clusters: ionic composition, parameters linked with the microbiological load and indicators of faecal contamination. In future surveys, parameters from these three groups will be simultaneously monitored to more accurately characterise roof collected rainwater.

Item Type:Article
Additional Information:This publication is available at http://www.sciencedirect.com/science/article/pii/S0043135411002181
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Other partners > Veolia Environnement (FRANCE)
Laboratory name:
Deposited On:26 Jan 2012 14:46

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