Analysis of combination test of infiltration box and absorption well to reduce road flooding

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Abstract

Urbanisation increases impervious surfaces, leading to increased runoff and flood risk, particularly in tropical urban areas. This study examines the effectiveness of a combination of infiltration boxes and wells installed in road medians as a decentralized stormwater management strategy. Experiments were conducted using a laboratory-scale flume model to compare hydrological responses with and without an infiltration system. The analysed parameters included runoff volume, peak discharge, peak time, and infiltration efficiency. The results indicated that the system performance varied depending on configuration, with runoff reductions ranging from 30.34% to 59.37%. Under optimal conditions, the system was able to reduce peak discharge by up to 85.17% and delay peak flow time by approximately 35 min, indicating significant improvements in retention capacity and flow control. The infiltration efficiency ranged from 50.74% to 68.47%, indicating the system ability to increase water absorption and reduce surface runoff. However, under extreme rainfall conditions (>100 mm/h), the system capacity reached its maximum limit, necessitating integration with conventional drainage. In conclusion, these findings confirm that infiltration boxes are an effective low impact development solution and can be integrated to improve urban hydrological resilience.