Testing the Concept of Mitigating Urban Flooding with Permeable Road: Case Study of Tong Wei Tah Street, Kuching City, Sarawak, Malaysia
DOI:
https://doi.org/10.48048/tis.2022.5592Keywords:
Drain, Flash flood, Permeable road, River, Stormwater detention, Urban runoffAbstract
This paper describes the investigation of permeable road as a mitigation measure for urban flooding. The study involves the reconstruction of a historical case of inundation, namely the 11 December 2019 flood event along the Tong Wei Tah Street in Greater Kuching City, Sarawak, Malaysia. The Storm Water Management Model version 5.0 was used as the platform to describe the flooding at the selected site and the functionality of permeable road to alleviate flooding. A permeable road with a dimension of 200 m long, 6 m wide and 1 m deep was simulated along the whole stretch of Tong Wei Tah Street. The model results show that flooding was caused by a backwater effect in the drainage system. Models predicted 0.1 to 0.5 m flood depths which matched the observed 0.3 m flood depth account of a local resident. The permeable road exhibited capability to absorb all the out-of-drain floodwaters, leaving no water due to the 11 December 2019 flood on the street. Modelling efforts demonstrated that the floodwater hydrographs in the drain rose and fell within 7 h, while the underground storage, filled and drained within 13 h. Moreover, the storage of permeable road was found to fill up to 75 %, reserving the unfilled 25 % for adverse weathers.
HIGHLIGHTS
- It was demonstrated in the case study of Tong Wei Tah Street that waterproof tarred road could be changed to permeable road that consists of permeable pavement layer and underground storage as urban flood mitigation strategy
- Through modelling efforts of a flooding event along Tong Wei Tah Street and its associated drainage systems, any spill of running water from the urban drains could be directed to the permeable road for temporary storage and conveyance
- It was found that floodwater on the road could be adsorbed by the permeable road structure itself, and as such, lessening the hydraulic burden of urban drains
GRAPHICAL ABSTRACT
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