Evaluation of infiltration engineering and storage tank systems for improved stormwater management

Lariyah Mohd Sidek - Universiti Tenaga Nasional (UNITEN), Aminuddin Ab Ghani - Universiti Sains Malaysia, Kaoru Treasure Takara - Kyoto University

Urbanisation of a watershed with its associated impact on the quantity and quality of stormwater runoff has resulted in the implementation of a number of alternatives for storm-water management. The early stage of stormwater management initiatives in Malaysia is concentrated on the minimization of downstream flooding caused by urbanisation. The objective of the project is to implement the source control and distributed storage systems to resolve identified problems of flooding and hydraulic overloading using the infiltration engineering systems and storage tank system. This paper presents the concept and result for subsurface infiltration and storage tank system which are studied to control stormwater quantity in Engineering Campus Universiti Sains Malaysia, Tronoh, Perak. The purpose of this study is to attenuate the peak flood hydrograph and volume by using three different infiltration and storage techniques based on the surrounding soil conditions. These systems are module infiltration system, loose rock infiltration system and module storage tank system. This paper also discusses some results retrieved from automatic data acquisition system. The comparison of peak flow attenuation and volume attenuation for these infiltration engineering and storage tank systems are highlighted in this paper. The study shows that the peak flow attenuation rate varies with different rainfall magnitude and storm duration at three study locations. These characteristics are important for optimising the design of detention/retention facilities. Modification to the system has been carried out in stage II data acquisition period after encountering flow constraints from stage I data analysis. The simulation using XP-SWMM confirmed the results obtained from the experiment.

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