Green Wall as Urban Flood Mitigation

Mah, D.Y.S. and Jing, Teck Lau and Hafizah Mariah, Mohd Abuseman and Fang, Yenn Teo (2017) Green Wall as Urban Flood Mitigation. Proceedings of 37th International Association of Hydro-environmental Research (IAHR) World Congress. pp. 2083-2087. ISSN 1562-6865

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Abstract

This study intends to look into modular-typed green wall, specifically with coconut peat as the growing medium. Commonly, such design is attached to vertical outdoor wall. Therefore, it is suggested to direct roof runoff to the green wall as an urban flood mitigation strategy. Characteristics of coconut peat are investigated through experimental works. The application as urban runoff control is demonstrated through a modelling case study of a typical commercial lot. SWMM model is developed by taking the advantage of its low impact development interface to apply bio-retention system as a green wall. Scenarios of using dry and saturated coconut peats are subjected to intense 15-minute 10-year ARI storm event. Outputs of the model suggest that a straight column of green wall modules in 700 mm wide, 200 mm thick and 12000 mm high is capable to fully capture the 6.3 m3 of total roof runoff generated by the design storm. Hence, the idea of adopting green wall for urban flood mitigation is encouraging.

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