Stream and Spring Water Evolution in a Rapidly Urbanizing Watershed, Austin, TX

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dc.creatorBeal, Lakin
dc.creatorBanner, Jay
dc.creatorSenison, Jeffrey
dc.creatorMusgrove, MaryLynn
dc.creatorYasbek, Lindsey
dc.creatorBendick, Nathan
dc.creatorHerrington, Christopher
dc.creatorReyes, Christopher
dc.date.accessioned2021-01-12T15:28:52Z
dc.date.available2021-01-12T15:28:52Z
dc.date.issued2020-02-27
dc.description.abstractQuantifying urban development impacts on fresh water quality and quantity is critical, especially as growing populations concentrate in urban centers and with climate change projections of increased hydrologic extremes. We investigate geochemical processes through which municipal supply and waste water, carbonate bedrock, and soils impact stream and spring water compositions within the Bull Creek watershed (Austin, Texas). This watershed exhibits a sharp geographic divide between urban and rural land. Urban and rural waters were assessed to quantify relative influences of municipal water on stream and spring water elemental compositions and Sr/Sr values. Higher Sr/Sr for samples from urban sites relative to rural sites can be accounted for by two processes: (1) water leakage from municipal infrastructure and/or irrigation or (2) ion exchange as precipitation infiltrates through soils with varying Sr/Sr. Irrigated soils have higher Sr/Sr than unirrigated soils, indicating that irrigated municipal water resets soil compositions and that process (1) is a dominant driver of urban stream and spring water evolution. Geochemical modeling results indicate that urban waters consist of 50% to 95% municipal water. Geochemical modeling further demonstrates the evolution of municipal water as it infiltrates as groundwater and undergoes water‐rock interaction. These results are compared with groundwater compositions on a regional scale to infer local flow paths and relative groundwater residences times of municipal water. This study provides a geochemical modeling framework that quantifies both the significance of municipal water on urban stream water and soil compositions and the role of municipal water within urbanized watersheds and aquifersen_US
dc.description.departmentOffice of the VP for Researchen_US
dc.identifier.citationBeal, L., Senison, J., Banner, J., Musgrove, M. L., Yazbek, L., Bendik, N., et al. (2020). Stream and spring water evolution in a rapidly urbanizing watershed, Austin, TX. Water Resources Research, 56, e2019WR025623. https:// doi.org/10.1029/2019WR025623en_US
dc.identifier.doi10.1029/2019WR025623
dc.identifier.urihttps://hdl.handle.net/2152/84247
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/11235
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofPlanet Texas 2050 - Published Researchen_US
dc.rights.restrictionRestricteden_US
dc.subjectwateren_US
dc.subjectgeochemical modelingen_US
dc.subjectmunicipal supply and waste wateren_US
dc.subjectcarbonate bedrocken_US
dc.subjectwatershedsen_US
dc.subjectgroundwateren_US
dc.titleStream and Spring Water Evolution in a Rapidly Urbanizing Watershed, Austin, TXen_US
dc.typeManuscripten_US

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