Mapping of Escherichia coli Sources Connected to Waterways in the Ruamahanga Catchment, New Zealand

Environmental Science & Technology
John R DymondR W Muirhead

Abstract

Rivers and streams in New Zealand are natural with free access and used by many people for swimming and fishing. However, pastoral farming with free grazing animals is a common land use in New Zealand and faecal microorganisms from them often end up in waterways. These microorganisms can seriously affect human and animal health if ingested. This paper describes spatial modeling using GIS of Escherichia coli sources in a large catchment (350 000 ha), the Ruamahanga. By examining the pathway of water over and through soils, it is possible to determine whether E. coli sources are connected to waterways or not. The map of E. coli sources connected to waterways provides useful context to those setting water quality limits. This approach avoids the complexity of modeling the fate and transport of E. coli in waterways, yet still permits the assessment of catchment-wide mitigation and best management practice. Fencing of waterways would minimize E. coli sources directly defecated to water and would reduce total E. coli sources by approximately 35%. Introduction of dung beetles would minimize sources connected to waterways by overland flow and would reduce total E. coli sources by approximately 35%. Construction of dairy effluent ponds ...Continue Reading

References

Nov 27, 2002·Applied and Environmental Microbiology·Gunjan Pandey, Rakesh K Jain
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Jan 16, 2004·Water Research·Rob Collins, Kit Rutherford
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Feb 9, 2011·Journal of Water and Health·Rebecca StottRichard Muirhead
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Jun 13, 2012·Journal of Natural Science, Biology, and Medicine·Manjul Tiwari
May 21, 2014·Environmental Science & Technology·Eelco FranzHetty Blaak

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