Civil Engineering and Architecture Vol. 8(6), pp. 1335 - 1349
DOI: 10.13189/cea.2020.080617
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Hydraulic Modelling Analysis for Road Stormwater Drainage Evaluation under RCPs‎ Based Rainfall Data

Mohammed Saleh Al-Ghadi ^1,*, Wan Hanna Melini Wan Mohtar ¹, Siti Fatin Mohd Razali ¹, Ahmed El-Shafie ^2
1 Department of Civil and Structural Engineering, Faculty of Engineering and Built Environment, National University of Malaysia, 43600, Bangi, Selangor, Malaysia
² Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

ABSTRACT

Road drainage systems are often-constructed utilised design approaches not incorporating process-based depictions of possible hydrological responses, resulting in insufficient systems due to infrastructural development and climate change and ultimately, increased hydrological reaction. This study assessed possible effects of precipitation intensity variation following future severe rainfall events on the current road drainage system as whether pre-climatic stormwater drainage system could withstand potentially higher discharges and the need for modified design guidelines incorporating possible precipitation intensity variations due to ‎climate change. A case study was undertaken utilising rainfall data to develop an intensity-duration-frequency (IDF) curve representing precipitation volume variations due to climate change. The peak discharge and water level were simulated using hydraulic software program SWMM 5.1 for the existing open drainage system, wherein three future potential climate scenarios, namely 2030, 2040, and 2050 were simulated based on the RCP4.5 and RCP8.5 scenarios. The simulation results showed a tremendous future precipitation increment for RCP4.5 and RCP8.5 scenarios, yielding the following values, respectively: 28.8%, ‎‎43.7% and 34.6% and 65%, 61.5% and 75.5%. Therefore, the study findings and approach implemented should be considered when detailing assessments and preserving areas are at risk of high water flows. The study concludes that the existing road drainage system's inadequacy to manage copious rainfall amounts ‎anticipated due to climate change. Therefore, the study contributes to suggest the need for developing ‎drainage system magnitude using higher return periods to mitigate flood levels ‎on urban road networks.

KEYWORDS
Intensity-Duration-Frequency (IDF) Curve, Extreme Rainfall Changes, Road Drainage Infrastructure, Climate Change, ‎Urban Flash-Flood, SWMM

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Mohammed Saleh Al-Ghadi , Wan Hanna Melini Wan Mohtar , Siti Fatin Mohd Razali , Ahmed El-Shafie , "Hydraulic Modelling Analysis for Road Stormwater Drainage Evaluation under RCPs‎ Based Rainfall Data," Civil Engineering and Architecture, Vol. 8, No. 6, pp. 1335 - 1349, 2020. DOI: 10.13189/cea.2020.080617.

(b). APA Format:
Mohammed Saleh Al-Ghadi , Wan Hanna Melini Wan Mohtar , Siti Fatin Mohd Razali , Ahmed El-Shafie (2020). Hydraulic Modelling Analysis for Road Stormwater Drainage Evaluation under RCPs‎ Based Rainfall Data. Civil Engineering and Architecture, 8(6), 1335 - 1349. DOI: 10.13189/cea.2020.080617.