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Enhancing stormwater sediment settling at detention pond inlets by a Bottom Grid Structure
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water. (Urban Water Engineering)ORCID iD: 0000-0003-2186-453X
Czech Technical University in Prague.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water. (Urban Water Engineering)
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water. (Urban Water Engineering)
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2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Stormwater sediments of various sizes and densities are recognised as one of the most important stormwater quality parameters that can be conventionally controlled by settling in detention ponds. The Bottom Grid Structure (BGS) is an innovative (non-proprietary) concept proposed in this study to enhance removal of stormwater sediments entering ponds and reduce sediment resuspension. This concept was studied in a hydraulic scale model with the objective of elucidating the effects of the BGS geometry on stormwater sediment trapping. Towards this end, the BGS cell size and depth, and the cell cross-wall angle were varied for a range of flow rates, and the sediment trapping efficiency was measured in the model. The main value of the observed sediment trapping efficiencies, in the range from 13 to 55%, was a comparative assessment of various BGS designs. In general, larger cells (footprint 10x10 cm, in the model) were more effective than the smaller cells (5x5 cm), the cell depth exerted small influence on sediment trapping, and the cells with inclined cross-walls proved more effective in sediment trapping than the vertical cross-walls. However, the BGS with inclined cross-walls would be harder to maintain. Future studies should address an optimal cell design and testing in an actual stormwater pond.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Stormwater ponds; sediment settling; hydraulic scale modelling; sediment trapping efficiency
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-76465OAI: oai:DiVA.org:ltu-76465DiVA, id: diva2:1362878
Conference
Sewer Processes and Networks - SPN9
Funder
Swedish Research Council Formas, 2016-20075Available from: 2019-10-21 Created: 2019-10-21 Last updated: 2020-02-28

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CiteExportLink to record
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Citation style
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