Faecal contamination over flood events in a pastoral agricultural stream in New Zealand

作者: J.W. Nagels , R.J. Davies-Colley , A.M. Donnison , R.W. Muirhead

DOI: 10.2166/WST.2002.0408

关键词: Deposition (geology)Environmental scienceGrazingTurbidityHydrologyContaminationDrainage basinWater qualityBeef cattleFlood myth

摘要: Faecal bacterial dynamics during flood events were studied in the Topehaehae Stream near Morrinsville, New Zealand, a catchment used for grazing dairy and beef cattle. During rising limb of natural event, E. coli concentration rose by more than 2 orders magnitude peaked at 41,000 cfu/100 mL. correlated closely with turbidity over both variables close to time maximum flow acceleration rather peak flow. An artificial on same stream, created releasing water from supply reservoir fine weather no wash-in catchment, produced broadly similar pattern faecal contamination (peak = 12,500 mL). This other evidence suggests that direct deposition matter cattle stream channel may be or greater importance land. The experiments have been useful constructing model yields, they imply exclusion livestock channels appreciably improve quality.

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