Abstract
Thermotolerant coliform (TC) loadings were quantified for 49 catchments draining into the North and South Bays of Santa Catarina (SC, southeastern Brazil), an area known for its tourism and aquaculture. TC loadings were calculated based on flow measurements taken in 26 rivers. TC concentrations ere quantified based on surface water samples collected at 49 catchment outlets in 2012 and 2013. Median TC loads ranged from 3.7 × 103 to 6.8 × 108 MPN s−1. TC loadings in the catchments increased in proportion to increases in resident human population, population density and percentage of urbanised area. Catchments with more than 60% of area covered by wastewater collection and treatment systems had higher TC loads per person than catchments with less than 25%. Based on the study catchments, these results indicate that current sewerage infrastructure is ineffective in reducing contamination of faecal origin to surface waters. These findings have important implications for the management of microbiological health hazards in bathing, recreational and shellfish aquaculture waters in the North and South Bays of Santa Catarina Island.
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Acknowledgements
The modelling work reported in this paper was funded by the Conselho Nacional de Pesquisa (CNPq) (Project CNPq/CT-Hidro/MPA no. 18/2010). We are grateful for this funding and also for information on sewerage infrastructure provided by the Municipality of Florianópolis.
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Garbossa, L.H.P., Souza, R.V., Campos, C.J.A. et al. Thermotolerant coliform loadings to coastal areas of Santa Catarina (Brazil) evidence the effect of growing urbanisation and insufficient provision of sewerage infrastructure. Environ Monit Assess 189, 27 (2017). https://doi.org/10.1007/s10661-016-5742-0
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DOI: https://doi.org/10.1007/s10661-016-5742-0