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Sediment transport in grassed swales during simulated runoff events
2002 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 45, no 7, p. 41-49Article in journal (Refereed) Published
Abstract [en]

Particle trapping in nine different grassed swales was measured successfully with a standardised runoff event simulation procedure. The percentage of total suspended solids removed ranged from 79 to 98%. It was found that sedimentation processes, rather than grass filtration governed the overall particle trapping efficiency. The highest particle trapping efficiency was observed in the field swales with dense, fully developed turf. A high infiltration rate was beneficial for the particle trapping and an increased swale length made it possible for smaller particles to be captured. A densely vegetated, ten metre long swale, receiving a stormwater flow of 1.0 litres per second, may capture a majority of the waterborne particles with settling velocities larger than 0.1 metres per hour. A simple model of particle trapping efficiency in grassed swales was developed and tested. It was found that mean swale residence time could be used as a design parameter for particle removal in grassed swales. The suggested exponential relationship between mean swale residence time and particle settling velocity associated with a certain trapping efficiency is so far only valid for a limited range of swale designs and residence times.

Place, publisher, year, edition, pages
2002. Vol. 45, no 7, p. 41-49
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-6620Local ID: 4dce6ab0-798b-11db-8824-000ea68e967bOAI: oai:DiVA.org:ltu-6620DiVA: diva2:979506
Note
Validerad; 2002; Bibliografisk uppgift: NOVATECH 2002 - 4. International Conference on Innovative Technologies in Urban Drainage, Lyon-Villeurbanne [France], 25-27 Jun 2001; 20061121 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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