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Assessing Hydrological Effects of Bioretention Cells for Urban Stormwater Runoff in Response to Climatic Changes

1
School of Architecture, Southeast University, Nanjing 210096, China
2
College of Architecture and Urban Planning, Guangzhou University, Guangzhou 510006, China
3
Biophilic lab, Z+T Studio, Shanghai 200052, China
4
Nanyang Environment & Water Research Institute, Nanyang Technological University, Singapore 637141, Singapore
5
School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
6
Faculty of Built Environment, University of New South Wales, Sydney, NSW 2052, Australia
7
School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore
*
Authors to whom correspondence should be addressed.
Water 2019, 11(5), 997; https://doi.org/10.3390/w11050997
Received: 31 March 2019 / Revised: 24 April 2019 / Accepted: 9 May 2019 / Published: 13 May 2019
(This article belongs to the Special Issue Urban Rainfall Analysis and Flood Management)
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Abstract

An investigation into the effectiveness of bioretention cells (BCs) under potential climatic changes was conducted using representative concentration pathways. A case study of Guangzhou showed changes in peak runoff in climate change scenarios, with obvious growth in RCP8.5 and slight growth in RCP2.6. The performance of BCs on multiple parameters, including reduction of runoff volume, peak runoff, and first flush, were examined in different design storms using a hydrology model (SWMM). The effectiveness of BCs varied non-linearly with scale. Their performance fell by varying amounts in the various scenarios. BCs could provide sufficient effects in response to short-return-period and short-duration storms, but the performance of BCs decreased with heavy storms, especially considering climate change. Hence, BCs cannot replace grey infrastructure but should be integrated with them. The method developed in this study could be useful in the planning and design of low impact development in view of future climate changes. View Full-Text
Keywords: bioretention; stormwater; climate change; scenario; low impact development; SWMM bioretention; stormwater; climate change; scenario; low impact development; SWMM
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, M.; Zhang, D.; Lou, S.; Hou, Q.; Liu, Y.; Cheng, Y.; Qi, J.; Tan, S.K. Assessing Hydrological Effects of Bioretention Cells for Urban Stormwater Runoff in Response to Climatic Changes. Water 2019, 11, 997.

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