Application of StormPav Modules as Alternative Home-Based On-Site Detention System

Ts. Johnny Ong King, Ngu (2023) Application of StormPav Modules as Alternative Home-Based On-Site Detention System. PhD thesis, University Malaysia Sarawak.

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Abstract

On-site stormwater detention system within a residential property is meant for an environmental protection device that temporarily stores stormwater within the property lot to mitigate flash flood, particularly during rainy seasons. A field test is constructed in a real-life terrace house’s car porch with a 4.40 m (W) x 4.70 m (L) x 0.45 m (D) tank filled with precast-concrete modular units (StormPav) with an effective storage volume of 3.97 m3. Inflow downpipe is installed to the detention tank and connected to the roof gutter which receives rainwater from the house roof; while a pipeline is installed to discharge outflow from the tank to the house perimeter drain. It has recorded sixteen observed storm events coincided with the 2019/2020 Northeast Monsoon that consist of rainfall depth categories ranging from 0-20 mm, 20-30 mm, 30-40 mm, 40-50 mm rainfall depths. Another four historical storm events that coincided with Northeast Monsoon seasons from 2015-2017 are sourced to augment the analysis. The Kolmogorov-Smirnov goodness of fit tests between the observed and modelled cumulative distributions have produced 0.01-0.14 maximum vertical distances that are lower than the 0.41-0.68 critical values which indicating close matches. Outcomes from the validated model have suggested to use an outlet size of 0.055 m. By combining the analyses from the field test and SWMM model, it is found the home-based system is able to contain all stormwaters of the rainfall depths mentioned above. Collected field data from a 95m2 roof catchment is used to model an OSD system with 50m2 and 150m2 roof catchments. The 150m2 roof catchment had steep line graphs and the OSD system could handle up to 30mm rainfall, but had the highest water detention and attenuation rate (65%). The 50m2 roof catchment had the lowest attenuation rate (15%) due to limited detention.

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