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Hydrology 2015, 2(4), 193-209; doi:10.3390/hydrology2040193

Urban Stormwater Temperature Surges: A Central US Watershed Study

Water Resources Program, Department of Forestry, School of Natural Resources, University of Missouri, 203 ABNR Building, Columbia, MO 65211, USA
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Vijay P. Singh
Received: 10 July 2015 / Revised: 18 September 2015 / Accepted: 20 October 2015 / Published: 28 October 2015
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Abstract

Impacts of urban land use can include increased stormwater runoff temperature (Tw) leading to receiving water quality impairment. There is therefore a need to target and mitigate sources of thermal pollution in urban areas. However, complex relationships between urban development, stormwater runoff and stream water heating processes are poorly understood. A nested-scale experimental watershed study design was used to investigate stormwater runoff temperature impacts to receiving waters in a representative mixed-use urbanizing watershed of the central US. Daily maximum Tw exceeded 35.0 °C (threshold for potential mortality of warm-water biota) at an urban monitoring site for a total of five days during the study period (2011–2013). Sudden increases of more than 1.0 °C within a 15 min time interval of Tw following summer thunderstorms were significantly correlated (CI = 95%; p < 0.01) to cumulative percent urban land use (r2 = 0.98; n = 29). Differences in mean Tw between monitoring sites were significantly correlated (CI = 95%; p = 0.02) to urban land use practices, stream distance and increasing discharge. The effects of the 2012 Midwest USA drought and land use on Tw were also observed with maximum Tw 4.0 °C higher at an urban monitoring site relative to a rural site for 10.5 h. The current work provides quantitative evidence of acute increases in Tw related to urban land use. Results better inform land managers wishing to create management strategies designed to preserve suitable thermal stream habitats in urbanizing watersheds. View Full-Text
Keywords: stream water temperature; experimental watershed study; urban heat island; storm water runoff; water quality stream water temperature; experimental watershed study; urban heat island; storm water runoff; water quality
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zeiger, S.J.; Hubbart, J.A. Urban Stormwater Temperature Surges: A Central US Watershed Study. Hydrology 2015, 2, 193-209.

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