4.7 Article

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

期刊

JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 207, 期 -, 页码 60-69

出版社

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2017.11.018

关键词

Blue-green; Cloudburst; Urban drainage; Flood mitigation; Retrofit; Stormwater

资金

  1. Sweden Water Research
  2. J. Gustaf Richert Foundation at SWECO [2015-00181]
  3. Swedish Water and Wastewater Association (SWWA) via VA-teknik Sodra [15-108]

向作者/读者索取更多资源

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 Malmo, 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. (C) 2017 Elsevier Ltd. All rights reserved.

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