Modelling faecal indicator concentrations in large rural catchments using land use and topographic data

Journal of Applied Microbiology
J CrowtherC A Francis

Abstract

To characterize and model spatial variations in faecal-indicator organism concentrations in watercourses draining a large rural catchment during the bathing season. Presumptive coliform (PC), presumptive Eschericia coli (PE) and presumptive enterococci (PEnt) concentrations were determined under base- and high-flow conditions at 24 monitoring points in the Rheidol/Ystwyth catchment, Wales. Relationships with land use and topographic variables within their 'subcatchments' were investigated. Geometric mean (GM) concentrations typically increase more than 10-fold at high flow. The proportion of improved pasture within subcatchments explains 81.6, 73.0 and 85.8%, respectively, of the variance in high-flow GM PC, PE and PEnt concentrations. Distributed modelling suggests that organisms derived from more distant parts of subcatchments may be lost through die-off and sedimentation along watercourses at base flow, although not at high flow. Reductions in concentrations are also evident downstream of reservoir impoundments. Large rural catchments may contribute substantially to faecal indicator loadings in coastal waters. Indicator concentrations can be modelled successfully using land use and topographic data. Development of a modellin...Continue Reading

Citations

Jul 31, 2012·Marine Environmental Research·Jiao Wang, Zhiqiang Deng
Jan 28, 2012·Environment International·R W Muirhead, R M Monaghan
Sep 9, 2015·Environmental Pollution·Paul PettusYangdong Pan
May 12, 2007·Journal of Environmental Monitoring : JEM·Carl M StapletonTerry Hindle
Oct 3, 2018·Journal of Environmental Quality·Dennis GilfillanPhillip Scheuerman
Aug 6, 2008·Environmental Science & Technology·Walter E FrickRichard G Zepp
Jul 9, 2008·Environmental Science & Technology·Meredith B Nevers, Richard L Whitman

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