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Seasonal and stormflow chloride loads in an urban–agricultural watershed in central Illinois, USA

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Abstract

Manual and high-frequency measurements (n = 535) of chloride (Cl) along a low-order stream in an urban–agricultural watershed (8% urban, 87% agriculture) were conducted to investigate the importance of stormflow to Cl transport. Sampling was conducted from February 2018 to February 2019; manual sampling occurred weekly, while stormflows were sampled at high frequency. Total Cl export was nearly 780,000 kg, of which 42.1% occurred during winter. Stormflows, which represented 19% of the period, contributed 57.6% of the total Cl load. The importance of stormflows varied seasonally; winter and spring storms exported nearly half of total Cl, 29.1% and 18.2% respectively, while summer (8.2%) and fall storm (2.1%) events account for only ~ 10% of total export. A substantial portion of Cl export, 43.4%, also occurred during baseflow, likely from accumulation of Cl related to road salt and KCl fertilizer in groundwater. The results identified two periods of elevated Cl concentrations: (1) flushing of road salt from impervious surfaces during and immediately following the cold season and (2) transport of salt accumulated from the dry season. Elevated discharges associated with summer and fall stormflows when road salt was not present did not generate similar Cl loads, despite peak discharge values larger than those measured in the winter and spring. The lack of deicing application and a shift to stored Cl during the summer stormflows created a discharge–load relationship that reached an asymptote where further increases in discharge do not correspond with increased Cl load.

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Availability of data and materials

The data that support the findings of this study are openly available in Faculty Publications– Geography, Geology, and the Environment at https://ir.library.illinoisstate.edu/fpgeo/1/.

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Not applicable.

Abbreviations

ELW:

Evergreen Lake watershed

PoTCL:

Percent of total cumulative load

PoSCL:

Percent of total storm cumulative load

PoSEV:

Percent of total storm-event volume

PoTV:

Percent of total volume

SMC:

Six Mile Creek

TCL:

Total cumulative load

TEV:

Total event volume

SCL:

Total storm cumulative load

TV:

Total volume

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Acknowledgements

The authors thank the City of Bloomington and property owners for access to the sampling locations. The authors thank the anonymous reviewers for their comments and suggests that have improved the paper.

Funding

A.O. received a student research grant from the Illinois Groundwater Association.

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Contributions

Conceptualization, AO and EP; methodology, AO and EP; formal analysis, AO; investigation, AO and EP; data curation, EP; writing—original draft preparation, AO; writing—review and editing, AO, and EP; visualization, AO and EP; supervision, EP; project administration, EP. All authors have read and agreed to the published version of the manuscript.

Corresponding author

Correspondence to Eric W. Peterson.

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The authors declare no conflicts of interest.

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Oberhelman, A., Peterson, E.W. Seasonal and stormflow chloride loads in an urban–agricultural watershed in central Illinois, USA. Environ Earth Sci 80, 445 (2021). https://doi.org/10.1007/s12665-021-09744-x

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  • DOI: https://doi.org/10.1007/s12665-021-09744-x

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