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Efficiency of blue-green stormwater retrofits for flood mitigation – Conclusions drawn from a case study in Malmö, Sweden

Haghighatafshar, Salar LU orcid ; Nordlöf, Beatrice ; Roldin, Maria ; Gustafsson, Lars-Göran ; la Cour Jansen, Jes LU and Jönsson, Karin LU (2018) In Journal of Environmental Management 207. p.60-69
Abstract
Coupled one-dimensional (1D) sewer and two-dimensional (2D) overland flow hydrodynamic models were constructed to evaluate the flood mitigation efficiency of a renowned blue-green stormwater retrofit, i.e. Augustenborg, in Malmö, Sweden. Simulation results showed that the blue-green stormwater systems were effective in controlling local surface flooding in inner-city catchments, having reduced the total flooded surfaces by about 70%. However, basement flooding could still be a potential problem depending on the magnitude of the inflows through combined sewer from upstream areas. Moreover, interactions between blue-green retrofits and the surrounding pipe-system were studied. It was observed that the blue-green retrofits reduced the peak... (More)
Coupled one-dimensional (1D) sewer and two-dimensional (2D) overland flow hydrodynamic models were constructed to evaluate the flood mitigation efficiency of a renowned blue-green stormwater retrofit, i.e. Augustenborg, in Malmö, Sweden. Simulation results showed that the blue-green stormwater systems were effective in controlling local surface flooding in inner-city catchments, having reduced the total flooded surfaces by about 70%. However, basement flooding could still be a potential problem depending on the magnitude of the inflows through combined sewer from upstream areas. Moreover, interactions between blue-green retrofits and the surrounding pipe-system were studied. It was observed that the blue-green retrofits reduced the peak flows by approximately 80% and levelled out the runoff. This is a substantial advantage for downstream pipe-bound catchments, as they do not receive a cloudburst-equivalent runoff from the retrofitted catchment, but a reduced flow corresponding to a much milder rainfall. Blue-green retrofits are more effective if primarily implemented in the upstream areas of a pipe-bound catchment since the resulting reduced runoff and levelled out discharge would benefit the entire network lying downstream. Implementing blue-green retrofits from upstream towards downstream can be considered as a sustainable approach.
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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Blue-green, Cloudburst, Urban Drainage, flood mitigation, Retrofit, stormwater, Stormwater system, Stormwater runoff, SUDS, LID
in
Journal of Environmental Management
volume
207
pages
10 pages
publisher
Elsevier
external identifiers
  • pmid:29154009
  • scopus:85034067619
ISSN
0301-4797
DOI
10.1016/j.jenvman.2017.11.018
project
Sustainable Urban Flood Management
What rainfall events can be managed in the Eco-City of Augustenborg?
Blue-green stormwater systems for citywide flood mitigation - Monitoring, conceptualization, modelling, and evaluation
language
English
LU publication?
yes
id
d3837477-edcb-450e-a89c-9ef4e069125d
date added to LUP
2017-12-12 15:29:48
date last changed
2022-04-25 04:13:48
@article{d3837477-edcb-450e-a89c-9ef4e069125d,
  abstract     = {{Coupled one-dimensional (1D) sewer and two-dimensional (2D) overland flow hydrodynamic models were constructed to evaluate the flood mitigation efficiency of a renowned blue-green stormwater retrofit, i.e. Augustenborg, in Malmö, Sweden. Simulation results showed that the blue-green stormwater systems were effective in controlling local surface flooding in inner-city catchments, having reduced the total flooded surfaces by about 70%. However, basement flooding could still be a potential problem depending on the magnitude of the inflows through combined sewer from upstream areas. Moreover, interactions between blue-green retrofits and the surrounding pipe-system were studied. It was observed that the blue-green retrofits reduced the peak flows by approximately 80% and levelled out the runoff. This is a substantial advantage for downstream pipe-bound catchments, as they do not receive a cloudburst-equivalent runoff from the retrofitted catchment, but a reduced flow corresponding to a much milder rainfall. Blue-green retrofits are more effective if primarily implemented in the upstream areas of a pipe-bound catchment since the resulting reduced runoff and levelled out discharge would benefit the entire network lying downstream. Implementing blue-green retrofits from upstream towards downstream can be considered as a sustainable approach.<br/>}},
  author       = {{Haghighatafshar, Salar and Nordlöf, Beatrice and Roldin, Maria and Gustafsson, Lars-Göran and la Cour Jansen, Jes and Jönsson, Karin}},
  issn         = {{0301-4797}},
  keywords     = {{Blue-green; Cloudburst; Urban Drainage; flood mitigation; Retrofit; stormwater; Stormwater system; Stormwater runoff; SUDS; LID}},
  language     = {{eng}},
  month        = {{02}},
  pages        = {{60--69}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Environmental Management}},
  title        = {{Efficiency of blue-green stormwater retrofits for flood mitigation – Conclusions drawn from a case study in Malmö, Sweden}},
  url          = {{http://dx.doi.org/10.1016/j.jenvman.2017.11.018}},
  doi          = {{10.1016/j.jenvman.2017.11.018}},
  volume       = {{207}},
  year         = {{2018}},
}