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dc.contributor.authorBeal, C.
dc.contributor.authorRassam, D.
dc.contributor.authorGardner, E.
dc.contributor.authorKirchhof, G.
dc.contributor.authorMenzies, N.
dc.contributor.editorVijay P. Singh
dc.date.accessioned2017-05-03T13:02:53Z
dc.date.available2017-05-03T13:02:53Z
dc.date.issued2008
dc.date.modified2011-08-30T06:21:08Z
dc.identifier.issn1084-0699
dc.identifier.doi10.1061/(ASCE)1084-0699(2008)13:8(681)
dc.identifier.urihttp://hdl.handle.net/10072/40422
dc.description.abstractThe goal of this study was to investigate how extreme hydraulic loading influences hydraulic pathways, and thus failure potential, of two soil absorption systems. A grid of tensiometers and piezometers were installed beneath and adjacent to the absorption trenches, and water height was manipulated to simulate different hydraulic loadings. At both sites, measured soil matric potentials along the trench sidewalls increased toward zero as water height increased over time, indicating that water was preferentially flowing laterally above the biomat zones. Saturated hydraulic conductivity (Ks) of the soil and biomat, and other hydraulic parameters were calibrated using inverse modeling procedures in HYDRUS-2D. We found generally good agreement between measured and predicted matric potentials. The calibrated model was then used to predict fluxes through different infiltrative zones under typical and extreme hydraulic loads. Modeling indicated that the overall infiltration rates through the biomat and subbiomat zones fell within a relatively narrow range of 0.025-0.046 m/day at the two sites. Under extreme hydraulic loading to trenches, fluxes through the upper trench sidewalls (i.e., the exfiltration zone) were predicted to be substantially greater (i.e., 80% of total flux) than through the biomat zone. This confirms the conclusions made from field results, that a permeable exfiltration zone provides a critical buffer to surface surcharging during extreme trench loading. Conversely, the presence of a high sidewall biomat can reduce sidewall exfiltration of effluent, and therefore increase the likelihood of surface surcharging.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent187353 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Society of Civil Engineers
dc.publisher.placeUnited States
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom681
dc.relation.ispartofpageto692
dc.relation.ispartofissue8
dc.relation.ispartofjournalJournal of Hydrologic Engineering
dc.relation.ispartofvolume13
dc.rights.retentionY
dc.subject.fieldofresearchEnvironmental Science and Management not elsewhere classified
dc.subject.fieldofresearchSoil Physics
dc.subject.fieldofresearchCivil Engineering
dc.subject.fieldofresearchcode050299
dc.subject.fieldofresearchcode050305
dc.subject.fieldofresearchcode0905
dc.titleInfluence of Hydraulic Loading and Effluent Flux on Surface Surcharging in Soil Absorption Systems
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2008 American Society of Civil Engineers (ASCE). This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.date.issued2008
gro.hasfulltextFull Text
gro.griffith.authorBeal, Cara D.


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