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The impacts of natural flood management and urban catchment composition on stormwater quality and in-channel sediment quality

Publication Date
October 12, 2016
Creators
Description
Natural Flood Management (NFM) techniques aim to reduce downstream flooding by storing and slowing the flow of stormwater to river channels. These techniques include a range of measures, including setback stormwater outfalls and the physical restoration of channels and floodplains, to improve the natural functioning of catchments. An additional benefit of NFM measures is the potential reduction in sediment and pollutant delivery to the channel. Urban development releases a variety of heavy metal and nutrient pollutants that enter rivers through stormwater outfalls with adverse effects on the aquatic ecosystem. In this study, the influence of channel modification and quality of the river habitat on the sediment quality surrounding stormwater outfalls was assessed. Sediment samples were taken at several outfalls within the Johnson Creek catchment, Oregon, USA, and analysed for a variety of urban pollutants. The level of river habitat quality and modification at each site were assessed using a semi-quantitative scoring methodology. Significant increases in pollutant levels were observed at outfalls, with a greater and more variable increase at direct compared to setback outfalls. Removal efficiency of certain pollutants was found to be significantly correlated to the level of habitat quality or modification (for Fe, Ba, Sn, Mg, P, K) indicating that more natural reaches had greater potential for pollutant removal. The findings highlight the multiple benefits associated with NFM and river restoration approaches in relation to sediment quality and pollutant content. Parent projects: Clean Water for All Portland-Vancouver ULTRA (Urban Long-term Research Area) project Blue-Green Cities Research Project Coverage (Temporal): May 2014-July 2014 Coverage (Spatial): Johnson Creek, Portland, Oregon USA Coverage (Coordinates): 45°26′51″N 122°17′18″W to 45°26′39″N 122°38′36″W Collection dates: May 2014-July 2014
External URI
DOI
Associate publ. DOI
Subjects (LCSH)

Flood control channel...

River sediments -- Qu...

River sediments -- Sa...

Johnson Creek (Clacka...

Pollutants -- Control...

Subjects

Stormwater pollution,...

Subjects (JACS)

JACS Subjects::Engine...

Subjects (LC)

Library of Congress S...

Divisions
Faculties, Schools and Departments::University of Nottingham, UK Campus::Faculty of Social Sciences::School of Geography
Data type
Physical sample analytical results (excel files), GIS spatial dataset (shapefiles)
Funders
Grant Number
EP/K013661/1
Data collection method
Detailed method is presented in the associated research paper. In summary, physical sediment sample collection from stormwater outfalls were processed for heavy metal and particle size distribution analysis.
Resource languages
English
Publisher
The University of Nottingham
Date Issued
October 11, 2016
File(s)
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Name

Physical sample analytical results.xlsx

Description
Contains the raw sample data for all sample locations within the study. Heavy metal, particle size distribution and contributing catchment information is provided in this dataset from which, following the methodology presented in the paper, the results can be replicated.
Size

67.13 KB

Format

Microsoft Excel XML

Checksum (MD5)

fec640112ed6bf22586a19174e1340a7

Thumbnail Image
Name

GIS spatial dataset.zip

Description
GIS spatial dataset
Size

85.75 KB

Format

Unknown

Checksum (MD5)

c7eefed6bff6845dbfa7f87c0bb4ab5b