Enhancing stormwater sediment settling at detention pond inlets by a Bottom Grid Structure

Document identifier: oai:DiVA.org:ltu-76465
Keyword: Engineering and Technology, Civil Engineering, Water Engineering, Teknik och teknologier, Samhällsbyggnadsteknik, Vattenteknik, Stormwater ponds, Sediment settling, Hydraulic scale modelling, Sediment trapping efficiency, VA-teknik, Urban Water Engineering, Centrumbildning - Centrum för dagvattenhantering (DRIZZLE), Centre - Centre for Stormwater Management (DRIZZLE)
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 3 Good health and wellbeing
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

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.

Authors

Ivan Milovanovic

Luleå tekniska universitet; Arkitektur och vatten; Urban Water Engineering
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Vojtech Bareš

Czech Technical University in Prague
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Annelie Hedström

Luleå tekniska universitet; Arkitektur och vatten; Urban Water Engineering
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Inga Herrmann

Luleå tekniska universitet; Arkitektur och vatten; Urban Water Engineering
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Tomas Piscek

Czech Technical University in Prague
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Jiri Marsalek

Luleå tekniska universitet; Arkitektur och vatten; Urban Water Engineering
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Maria Viklander

Luleå tekniska universitet; Arkitektur och vatten; Urban Water Engineering
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