Multiple rainfall event pollution transport by Sustainable Drainage Systems: the fate of fine sediment pollution
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A key design criterion of sustainable urban drainage systems is to mitigate urban stormwater pollution. Current research defines sustainable urban drainage systems (SuDS) pollutant treatment efficiency through the detention of total suspended solids, urban nutrients and heavy metal pollutants within the system during a design flow event, with research focusing on sand (>2mm) sediment movement. The impact of multiple rainfall-runoff events on the fine sediment (<2mm) treatment efficiency of SuDS is not yet well defined and the temporal movement of detained sediment has not been investigated in detail. The field research presented in this paper addresses this research gap, monitoring ongoing fine sediment transport through a best practice designed SuDS network over 12 months through the use of a novel rare earth oxide (REO) trace methodology. Through time-stepped monitoring of the fine sediment pollution across three SuDS treatment trains (networks), the following key conclusions have been drawn. (1) That fine sediment becomes re-suspended and re-deposited within SuDS assets and the network as a result of ongoing multiple rainfall-runoff events. (2) That this re-suspension continues for over 52 weeks. (3) That by area, linear wetlands (within the monitored networks) out-perform wetland and swale assets in multiple event fine sediment detention. And (4) that multiple event monitoring and analysis of fine sediment within a SuDS network highlights the under-performance of SuDS assets against current design event expectations.
Related publication DOI
- Sediment transport -- Research
- Drainage -- Research
- Runoff -- Purification -- Evaluation
- Runoff -- Environmental aspects
- Water quality management -- Evaluation
- Urban runoff -- Management -- Evaluation
- Contaminated sediments -- Management
- Sustainable urban drainage systems; sediment transport; rare earth tracer; pollutant treatment efficiency; stormwater quality
- JACS Subjects::Physical sciences::Science of aquatic & terrestrial environments::Environmental sciences::Applied environmental sciences
- Library of Congress Subject Areas::G Geography. Anthropology. Recreation::GE Environmental Sciences
- T Technology::TD Environmental technology. Sanitary engineering
- Faculties, Schools and Departments::University of Nottingham, UK Campus::Faculty of Social Sciences::School of Geography
Data typeTabulated data presented in the manuscript, e.g. rainfall simulations, xls files that compose each of the figures presented in the manuscript, and the original figure (for figures 2 to 6).
- Allen, D.
- Haynes, H.
- Olive, V.
- Funders::Engineering & Physical Sciences Research Council
- Blue-Green Cities Research Project
- Jan 2014 - Jan 2015
- J4M8 distribution park, West Lothian, Scotland
- Between Jan 2014 - Jan 2015
- 55°52′40.9″N 3°39′08.0″W
Data collection methodDetailed method is presented in the research paper. In summary, physical sediment sample collection from stomwater network. Trace and particle size distribution analysis were undertaken for each sample.
- Heriot-Watt University