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Title: The role of trees in urban stormwater management

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Landscape and Urban Planning
Additional Journal Information:
Journal Volume: 162; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-08 17:04:56; Journal ID: ISSN 0169-2046
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Citation Formats

Berland, Adam, Shiflett, Sheri A., Shuster, William D., Garmestani, Ahjond S., Goddard, Haynes C., Herrmann, Dustin L., and Hopton, Matthew E. The role of trees in urban stormwater management. Netherlands: N. p., 2017. Web. doi:10.1016/j.landurbplan.2017.02.017.
Berland, Adam, Shiflett, Sheri A., Shuster, William D., Garmestani, Ahjond S., Goddard, Haynes C., Herrmann, Dustin L., & Hopton, Matthew E. The role of trees in urban stormwater management. Netherlands. doi:10.1016/j.landurbplan.2017.02.017.
Berland, Adam, Shiflett, Sheri A., Shuster, William D., Garmestani, Ahjond S., Goddard, Haynes C., Herrmann, Dustin L., and Hopton, Matthew E. 2017. "The role of trees in urban stormwater management". Netherlands. doi:10.1016/j.landurbplan.2017.02.017.
title = {The role of trees in urban stormwater management},
author = {Berland, Adam and Shiflett, Sheri A. and Shuster, William D. and Garmestani, Ahjond S. and Goddard, Haynes C. and Herrmann, Dustin L. and Hopton, Matthew E.},
abstractNote = {},
doi = {10.1016/j.landurbplan.2017.02.017},
journal = {Landscape and Urban Planning},
number = C,
volume = 162,
place = {Netherlands},
year = 2017,
month = 6

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on March 10, 2018
Publisher's Accepted Manuscript

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  • Investigations of the chemical characteristics of urban stormwater sediments in the rapidly growing Phoenix metropolitan area of Maricopa County, Arizona, showed that the inorganic component of these sediments generally reflects geologic background values. Some concentrations of metals were above background values, especially cadmium, copper, lead, and zinc, indicating an anthropogenic contribution of these elements to the sediment chemistry. Concentrations, however, were not at levels that would require soil remediation according to guidelines of the US Environmental Protection Agency. Arsenic concentrations generally were above recommended values for remediation at a few sites, but these concentrations seem to reflect geologic rather thanmore » anthropogenic factors. Several organochlorine compounds no longer in use were ubiquitous in the Phoenix area, although concentrations generally were low. Chlordane, DDT and its decay products DDE and DDD, dieldrin, toxaphene, and PCBs were found at almost all sites sampled, although some of the pesticides in which these compounds are found have been banned for almost 30 years. A few sites showed exceptionally high concentrations of organochlorine compounds. On the basis of published guidelines, urban stormwater sediments do not appear to constitute a major regional environmental problem with respect to the chemical characteristics investigated here. At individual sites, high concentrations of organic compounds--chlordane, dieldrin, PCBs, and toxaphene--may require some attention. The possible environmental hazard presented by low-level organochlorine contamination is not addresses in this paper; however, high levels of toxicity in urban sediments are difficult to explain. Sediment toxicity varied significantly with time, which indicates that these tests should be evaluated carefully before they are used for management decisions.« less
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  • The composition and morphology of colloidal materials entering an urban waterway (Brays Bayou, Houston, USA) during a storm event was investigated. Analyses of organic carbon, Si, Al, Fe, Cr, Cu, Mn, Zn, Ca, Mg, and Ba were performed on the fraction of materials passing through a 0.45 {micro}m filter. This fraction, traditionally defined as dissolved, was further fractionated by ultracentrifugation into colloidal and dissolved fractions. Colloids, operationally defined by this procedure, accounted for 17% of the carbon, 32% of the silica, 79% of the Al, 85% of the Fe, 52% of the Cr, 43% of the Mn, and 29% ofmore » the Zn present in filtrates when averaged over the storm event. However, the composition of colloidal material was observed to change over time. For example, colloids were predominantly composed of silica during periods of dry weather flow and at the maximum of the stormwater flow, while carbon dominated the colloidal fraction at the beginning and declining stages of the storm event. These changes in colloidal composition were accompanied by changes in colloidal morphologies, varying from organic aggregates to diffuse gel-like structures rich in Si, Al, and Fe. The colloidal phase largely determined the variability of elements in the 0.45 {micro}m filtrate.« less