Degradation and biodiversity of rain gardens in the tropics
DOI:
https://doi.org/10.47818/DRArch.2025.v6i2169Keywords:
design maintenance, ecosystem services, green infrastructure, landscape degradation, rain gardensAbstract
Rain gardens are commonly applied as a nature-based stormwater management method in urban areas, yet the long-term impacts, possible degradation, and effects on biodiversity as a type of green infrastructure remain underexplored. By comparing two rain gardens in Singapore– one of the earlier prototypes in a neighbourhood managed by a local town council in Central Singapore at Potong Pasir, and a more recent one managed by the National Parks in the West at Jurong Lake Gardens, the ecological and aesthetic functions are investigated. Thus, the rain gardens are explored through the lenses of both functional and aesthetic degradation. Quantitative methods, including the Shannon Biodiversity Index, Green View Index, Colourfulness Index, and surface heat mapping, are applied. Observational methods, including spatial configurations of the rain gardens, plant health, and soil conditions, were also explored to understand the extent of degradation. Common challenges encountered in rain gardens included poor or improper maintenance, poor aesthetic and visual engagement, as well as improper design. Through the findings, comprehensive design and maintenance suggestions are provided for designers and planners to improve existing rain gardens and extend the lifespan and function of future gardens. Rain garden lifespans can be lengthened to reap long-term benefits like effective stormwater management and habitat creation for local biodiversity. Maintenance suggestions build upon existing grey infrastructure and nature-based solutions routine maintenance protocols, tackling the four key functions of a rain garden: sedimentation, filtration, infiltration, and bioretention. Design suggestions are drawn from the data analysed, including potential tree planting configurations and the use of groundcover to reduce surface temperature.
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References
AECOM. (n.d.). Jurong lake garden phase 2 development. https://aecom.com/projects/jurong-lake-garden-phase-2-development/
Attah, I. C., & Etim, R. K. (2020). Experimental investigation on the effects of elevated temperature on geotechnical behaviour of tropical residual soils. SN Applied Sciences, 2(3). https://doi.org/10.1007/s42452-020-2149-x
Bąk, J., & Barjenbruch, M. (2022). Benefits, inconveniences, and facilities of the application of rain gardens in urban spaces from the perspective of climate change–A review. Water, 14(7), 1153. https://doi.org/10.3390/w14071153
Behm, J. E., Bélouard, N., Gleditsch, J. M., Phillips, P. M., & Swartz, T. M. (2022). Trait-based approaches for understanding how biodiversity generates sustainable benefits in urban vegetated green infrastructure. Current Opinion in Environmental Sustainability, 57, 101204. https://doi.org/10.1016/j.cosust.2022.101204
Chaves, M. T. R., Moreira, J. G. R., Correia, K. P., Eloi, W. M., & Farias, T. R. L. (2025). Vegetation adaptability in a tropical urban rain garden: A study in northeast Brazil. Urban Forestry and Urban Greening, 107, p.128810. https://doi.org/10.1016/j.ufug.2025.128810
Chen, C.-F., Chen, Y.-W., Lin, C.-H., & Lin, J.-Y. (2024). Field performance of 15 rain gardens in different cities in Taiwan. The Science of the Total Environment, 947, 174545-174545. https://doi.org/10.1016/j.scitotenv.2024.17454
Chen, N., Tang, X., & Liu, W. (2022). Urban disaster risk prevention and mitigation strategies from the perspective of climate resilience. Wireless Communications and Mobile Computing. https://doi.org/10.1155/2022/4907084
Church, S. P. (2015). Exploring green streets and rain gardens as instances of small scale nature and environmental learning tools. Landscape and Urban Planning, 134, 229-240. https://doi.org/10.1016/j.landurbplan.2014.10.021
Dobbie, M. F. (2016). Designing raingardens for community acceptance. Cooperative Research Centre for Water Sensitive Cities. Melbourne, Australia.
Dobbie, M. F., & Farrelly, M. A. (2023). Affordance and the aesthetic experience of raingardens. Research Square. https://doi.org/10.21203/rs.3.rs-2903208/v1
Doğmuşöz, B. B. (2024). Plant selection for rain gardens in temperate climates: The case of Izmir, Turkey. Journal of Design for Resilience in Architecture and Planning, 5(1), 18-34. https://doi.org/10.47818/DRArch.2024.v5i1117
Dunnett, N., & Clayden, A. (2007). Rain gardens, managing water sustainability in the garden and designed landscape. Timber Press.
Ecotones and Habitats. (2019). Landzine international landscape award. https://landezine-award.com/jurong-lakeside-garden/
Ge, M., Huang, Y., Zhu, Y., Kim, M., & Cui, X. (2023). Examining the microclimate pattern and related spatial perception of the urban stormwater management landscape: The case of rain gardens. Atmosphere, 14(7), 1138. https://doi.org/10.3390/atmos14071138
Google Earth. (2025a). Potong Pasir Neighborhood. 1°20'01"N 103°51'54"E. 1,300m.
Google Earth. (2025b). Jurong Lake Gardens. 1°20'38"N 103°43'19"E. 1,100m.
Green Building Alliance. (n.d.). Rain gardens. https://gba.org/resources/green-building-methods/site-solutions/rain-gardens/
Guo, C., Li, J., Li, H., Zhang, B., Ma, M., & Li, F. (2018). Seven-year running effect evaluation and fate analysis of rain gardens in Xi’an, Northwest China. Water, 10(7), 944. https://doi.org/10.3390/w10070944
Guo, J. C. Y., & Luu, T. M. (2015). Operation of cap orifice in a rain garden. Journal of Hydrologic Engineering, 20(10). https://doi.org/10.1061/(ASCE)HE.1943-5584.0001184
Hanumesh, M., Mohan, M., & Anand, P. (2024). Enhancing urban resilience and biodiversity: Integrating rain gardens and green corridors. In Innovations in the Development of Sustainable Infrastructure: Proceedings of the International Conference on Technological Innovations in Multidisciplinary Engineering and Sciences. (pp. 52-65). Springer Nature.
Healthy Land and Water. (2020). Water sensitive urban design. Water by Design. https://waterbydesign.com.au/wsud#:~:text=Urban%20development%20using%20conventional%20approaches,water%20supply%20and%20sewage%20management
Housing and Development Board. (2024, June 21). Four Tengah BTO projects awarded top-tier Active, Beautiful, Clean Waters certification. https://www.hdb.gov.sg/about-us/news-and-publications/press-releases/21062024-Four-Tengah-BTO-Projects-Awarded-Top-tier-Active-Beautiful-Clean-Waters-Certification
Johnston, M. R., Balster, N. J., & Thompson, A. M. (2020). Vegetation alters soil water drainage and retention of replicate rain gardens. Water, 12(11), 3151. https://doi.org/10.3390/w12113151
Kelishadi, H., Mosaddeghi, M. R., Ayoubi, S., & Mamedov, A. I. (2018). Effect of temperature on soil structural stability as characterized by high energy moisture characteristic method. Catena, 170, 290-304. https://doi.org/10.1016/j.catena.2018.06.015
Lau, T.-K., & Lin, T.-P. (2023). Investigating the relationship between air temperature and the intensity of urban development using on-site measurement, satellite imagery and machine learning. Sustainable Cities and Society, 100, pp.104982–104982. https://doi.org/10.1016/j.scs.2023.104982
Laukli, K., Gamborg, M., Haraldsen, T. K., & Vike, E. (2022). Soil and plant selection for rain gardens along streets and roads in cold climates: Simulated cyclic flooding and real-scale studies of five herbaceous perennial species. Urban Forestry and Urban Greening, 68, p.127477. https://doi.org/10.1016/j.ufug.2022.127477
Li, J., Liu, F., & Li, Y. (2020). Simulation and design optimization of rain gardens via DRAINMOD and response surface methodology. Journal of Hydrology, 585. https://doi.org/10.1016/j.jhydrol.2020.124788
Liu, A., Egodawatta, P., & Goonetilleke, A. (2022). Ranking three water sensitive urban design (WSUD) practices based on hydraulic and water quality treatment performance: Implications for effective stormwater treatment design. Water, 14(8), 1296. https://doi.org/10.3390/w14081296
Loh, B. (2012). A selection of plants for bioretention system in the tropics. Centre for Urban Greenery and Ecology. https://www.nparks.gov.sg/-/media/cuge/pdf/rtn-04-2012---a-selection-of-plants-for-in-the-tropics.pdf
Ma, L., Guo, Z., Lu, M., He, S., & Wang, M. (2023). Developing an urban streetscape indexing based on visual complexity and self-organizing map. Building and Environment, 242, 110549. https://doi.org/10.1016/j.buildenv.2023.110549
Massachusetts Department of Environmental Protection. (2006). Bioretention areas & rain gardens. Massachusetts Clean Water Toolkit. https://megamanual.geosyntec.com/npsmanual/bioretentionareasandraingardens.aspx
McGuire, M. P., Grimley, D. A., Phillips, A. C., Stillwell, A. S., William, R., Shen, J., & Schneemann, M. (2021). Retrofitting urban land through integrative, subsoils-based planning of green stormwater infrastructure: a research framework. Environmental Research: Infrastructure and Sustainability, 1(3). https://doi.org/10.1088/2634-4505/ac27bd
Morash, J., Wright, A., LeBleu, C., Meder, A., Kessler, R., Brantley, E., & Howe, J. (2019). Increasing sustainability of residential areas using rain gardens to improve pollutant capture, biodiversity and ecosystem resilience. Sustainability, 11(12), 3269. https://doi.org/10.3390/su11123269
National Parks Board. (2024). NParks completes Jurong Lake Gardens with opening of rejuvenated Chinese and Japanese Gardens. https://www.nparks.gov.sg/news/news-detail/nparks-completes-jurong-lake-gardens-with-opening-of-rejuvenated-chinese-and-japanese-gardens
Public Utilities Board. (2018). Code of practice on surface water drainage (6th ed.). https://www.pub.gov.sg/Documents/CoP_On_Surface_Water_Drainage.pdf
Public Utilities Board. (2024). Active, beautiful, clean waters design guidelines (5th ed.). https://www.pub.gov.sg/-/media/Images/Feature/Content-Pages/Resources/Publications/Pdfs/ABC_Waters_Design_Guidelines.pdf
Puppala, H., Tamvada, J. P., Kim, B., & Peddinti, P. R. T. (2022). Enhanced green view index. MethodsX, 9, 101824. https://doi.org/10.1016/j.mex.2022.101824
Shi, L., Maruthaveeran, S., Yusof, M. J. M., Zhao, J., & Liu, R. (2024). Exploring herbaceous plant biodiversity design in Chinese rain gardens: A literature review. Water, 16(11), 1586. https://doi.org/10.3390/w16111586
Tang, S., Song, Y., Wang, Y., Jia, Z., Gao, X., Cheng, N., & Lu, T. (2024). Optimizing stormwater runoff treatment: The role of two-stage tandem rain gardens. Environmental Research, 262. https://doi.org/10.1016/j.envres.2024.119831
Tara, N., & Thrupp, C. (2018). Maintenance of WSUD Assets – “The good, the bad and the ugly.” In Proceedings of the 9th Australian Stream 1 Management Conference, Brisbane City Council. https://asnevents.s3.amazonaws.com/Abstrakt-FullPaper/51644/9ASM-Full-Paper.pdf
The Institution of Engineers Singapore. (2016). ABC waters at potong pasir–A case study [PDF]. https://www.ies-crm.com/professional/registry/abc/ABCWaters_Potong-Pasir_IES_Case%20Study%20slides.pdf
Vineyard, D., Ingwersen, W. W., Hawkins, T. R., Xue, X., Demeke, B., & Shuster, W. (2015). Comparing green and grey infrastructure using life cycle cost and environmental impact: A rain garden case study in Cincinnati, OH. Journal of the American Water Resources Association, 51(5), 1342-1360. https://doi.org/10.1111/1752-1688.12320
William, R., Gardoni, P., & Stillwell, A. S. (2019). Predicting rain garden performance under back-to-back rainfall conditions using stochastic life-cycle analysis. Sustainable and Resilient Infrastructure, 6(3-4), 143-155. https://doi.org/10.1080/23789689.2019.1660549
Xiao, Q., McPherson, E. G., Zhang, Q., Ge, X., & Dahlgren, R. (2017). Performance of two bioswales on urban runoff management. Infrastructures, 2(4), 12. https://doi.org/10.3390/infrastructures2040012
Ying, B. X., (2019), Potong Pasir: The idyllic town imbued with community spirit. Edgeprop Singapore. https://www.edgeprop.sg/property-news/potong-pasir-idyllic-town-imbued-community-spirit
Yuan, J., Dunnett, N., & Stovin, V. (2017). The influence of vegetation on rain garden hydrological performance. Urban Water Journal, 14(10), 1083-1089. https://doi.org/10.1080/1573062X.2017.1363251
Zhu, H., Nan, X., Yang, F., & Bao, Z. (2023). Utilizing the green view index to improve the urban street greenery index system: A statistical study using road patterns and vegetation structures as entry points. Landscape and Urban Planning, 237, 104780. https://doi.org/10.1016/j.landurbplan.2023.104780
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Copyright (c) 2025 Lina Altoaimi, Shruthakeerthi Karthikeyan, Akshitha Vadlakunta, Yuting Wang, Abdul Thaqif Abdul Terawis
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