TAILIEUCHUNG - Relative risk of surface water pollution by E. coli derived from faeces of grazing animals compared to slurry application

In 1972, the Clean Water Act (CWA) delineated the basic structure for regulating discharges of pollutants into waters and for establishing quality standards for surface waters under the authority of EPA [10]. Under the CWA’s National Pollutant Discharge Elimination System program, stormwater permits were required for sediment runoff from construction sites and discharges of pollutants into surface waters [11]. The permitting system requires adoption of technology-based and water quality-based effluent limits [11,12]. Fracturing activities that inject liquid into the ground or store waters in temporary pits without any discharge are not regulated under the CWA. Thus, there. | . Vinten et al. 13 Soil Use and Management 2004 20 13 22 DOI SUM2004214 Relative risk of surface water pollution by E. coli derived from faeces of grazing animals compared to slurry application . Vinten1 . Douglas1 . Lewis1 . Aitken2 . Fenlon3 Abstract. This article examines some of the factors that influence the relative risk of Escherichia coli pollution of surface waters from grazing animals compared to cattle slurry application. Drainage water from pipe-drained plots grazed with sheep 16 sheep lambs per hectare from 29 May to 17 July 2002 had average E. coli counts of 11 . mL 1 or of estimated E. coli inputs over the grazing period. Drainage water from plots on the same site treated with cattle slurry 36 m3 ha 1 on 29 May 2002 had lower average E. coli counts of 1 or of estimated faecal input. Sheep 16 lambs per hectare grazing under cooler moister conditions from 24 September to 3 December 2001 gave drainage water with much higher average E. coli counts of 282 . mL 1 or of estimated input which is more than twice the average E. coli counts previously reported under such conditions Vinten et al. 2002 Soil Use and Management 18 1 9 . Laboratory studies of runoff from soil slabs after slurry application showed that the mobility of E. coli in surface soil decreased with time suggesting that increased attachment to soil or migration to immobile water also provides at least part of the physical explanation for the relatively higher risk of pollution from grazing animals compared with slurry. Sampling for E. coli in field drainflow and in streamwater during a storm event in the predominantly dairy Cessnock Water catchment Ayrshire Scotland supported the hypothesis that E. coli transport is linked to grazing animals. For a 7-mm rainfall event roughly 14 of the estimated daily input from grazing livestock was transported to the river even though little slurry spreading had occurred in the catchment in the .

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