| Summary: | Pervious or porous concrete is one type of concrete technology that is regarded as both high-performing and environmentally benign. Floods are a common natural phenomenon that frequently occurs in various regions across the globe. This study focused on permeability of porous concrete to evaluate the effectiveness of porous concrete drainage systems. The physical drainage model, which focused on various sizes of porous cube (100 cm x 30 cm x 75 cm), (150 cm x 300 cm x 75 cm) and (200 cm x 300 cm x 75 cm) and various weir heights which are 5 cm,10 cm and 15 cm to stabilize the flow and create uniform flow. With various inflow (Qin) rate were successfully carried out in accordance with the necessary criteria. In the meantime, a linear analysis of velocity and depth was carried out, respectively with regression and correlation analysis has been used to evaluate the performance of porous concrete with various sizes. From the results, it indicates that According to the results, size of porous 200 cm x 300 cm x 75 cm with the largest porosity had the highest permeability rate (R2 = 0.9994) when compared to other sizes. Based on the findings, it was observed that the porous structure of 200x300x75cm show the greatest percentage reduction by 16.53 % and a reduction of 5.51 m per meter length, in comparison to other porous structures of varying sizes. As the size of porous materials increases, there is a corresponding increase in both permeability and porosity. Therefore, it can be concluded that the permeability and porosity of a porous material are enhanced when its size is increased. © 2024 Elsevier Ltd. All rights reserved.
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