Comparing the hydrological performance of blue green infrastructure design strategies in urban/semi-urban catchments for stormwater management

Abstract

Blue green infrastructure (BGI), in recent decades, have been increasingly recognized as robust stormwater control measures to reduce urban flooding, promote infiltration, and restore a catchment's flow to its pre-development stage. However, studies comparing the hydrological benefits of BGI alternatives at catchment scale are often limited to single catchment or single/few BGI options scaled over a catchment. This study designed a set of BGI alternatives as a combination of different BGI facilities in terms of the following: (a) spatial distribution scale (end-of-pipe vs. decentralized) and (b) naturalness scale (less engineered vs. more engineered), in three different urban catchments representing an inner city, a residential suburb, and a new urban housing. In addition, their hydrological performances were compared. A 10-year return period design rain and a continuous rain series of 11 years were modelled for each BGI alternative using the computer model (stormwater management model). It was observed that in most catchments, decentralized alternatives (both engineered and natural) showed better potential to reduce the magnitude and frequency of flooding than centralized measures. Similarly, the tested decentralized natural, less engineered alternatives showed higher potential to increase infiltration than the decentralized engineered alternatives in all three catchments. Meanwhile, infiltration-based BGI alternatives showed similar potential to mimic pre-development flow as other decentralized BGI alternatives.

Keywords

blue green infrastructure; flooding; infiltration; stormwater management; urban hydrology

Published in

Water Science and Technology
2024, volume: 90, number: 9, pages: 2696-2712
Publisher: IWA PUBLISHING

SLU Authors

• Sun, Zhengdong

  • Department of Landscape Architecture, Planning and Management, Swedish University of Agricultural Sciences
    

• Deak Sjöman, Johanna

  • Department of Landscape Architecture, Planning and Management, Swedish University of Agricultural Sciences
    

• Randrup, Thomas

  • Department of Landscape Architecture, Planning and Management, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Oceanography, Hydrology, Water Resources
Water Engineering

Publication identifier

• DOI: https://doi.org/10.2166/wst.2024.346

Permanent link to this page (URI)

https://res.slu.se/id/publ/133134