Assessing Linkages between E. coli Levels in Streambed Sediment and Overlying Water in an Agricultural Watershed in Iowa during the First Heavy Rain Event of the Season

dc.contributor.author Pandey, Pramod
dc.contributor.author Soupir, Michelle
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-15T19:19:33.000
dc.date.accessioned 2020-06-29T22:41:19Z
dc.date.available 2020-06-29T22:41:19Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 2014
dc.date.embargo 2014-01-28
dc.date.issued 2014-01-01
dc.description.abstract <p>This study involved field observations in Squaw Creek watershed, located in central Iowa, to investigate the impact of a heavy rain event (rainfall of 71 mm in 24 h) on E. coli levels in the streambed sediment and overlying water. We assessed relationships between streamflow and E. coli and nutrient levels in the water column and streambed sediment. The results showed that during a heavy rain event, E. coli levels in the water column varied considerably, ranging from 360 to 37,553 CFU per 100 mL with a mean of 7,598 CFU per 100 mL. Elevated streamflow resulted in greater levels of E. coli in the water column. Streambed sediment E. coli levels ranged from 896 to 6,577 CFU per 100 g with a mean of 3,355 CFU per 100 g. Regression analysis found exponential relationships between streamflow and E. coli levels in the water column (R<sup>2</sup> = 0.56) and between streamflow and E. coli levels in the streambed sediment (R<sup>2</sup> = 0.45). R<sup>2</sup> values of the exponential relationship between streamflow and water column E. coli levels increased considerably when regressions for the rising and falling limbs of the hydrograph were performed separately (R<sup>2</sup> = 0.64 and 0.94, respectively). The exponential relationship between total suspended solids (TSS) and water column E. coli levels yielded an R<sup>2</sup> of 0.38, while TSS and streamflow yielded an exponential relationship with an R<sup>2</sup> of 0.64. The results presented here provide information on in-stream bacteria dynamics of an agricultural watershed during the first heavy rain of the season. We anticipate that the results will improve the understanding of in-stream E. coli transport during rain events and provide insight for policy makers to allocate E. coli loads in impaired water bodies.</p>
dc.description.comments <p>This article is from <em>Transactions of the ASABE</em> 57 (2014): 1571–1581, doi:<a href="http://dx.doi.org/10.13031/trans.57.10371" target="_blank">10.13031/trans.57.10371</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/618/
dc.identifier.articleid 1899
dc.identifier.contextkey 6579010
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/618
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1404
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/618/2014_Pandey_AssessingLinkages.pdf|||Sat Jan 15 01:17:27 UTC 2022
dc.source.uri 10.13031/trans.57.10371
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Environmental Indicators and Impact Assessment
dc.subject.disciplines Water Resource Management
dc.subject.keywords E. coli
dc.subject.keywords Streambed sediment
dc.subject.keywords Suspended sediment
dc.subject.keywords Water quality
dc.title Assessing Linkages between E. coli Levels in Streambed Sediment and Overlying Water in an Agricultural Watershed in Iowa during the First Heavy Rain Event of the Season
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 04becbfb-7a97-4d96-a0dd-5514295530ee
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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