Evaluating the Role of Infiltration Wells in Sustainable Drainage Systems: A Case Study in Sengkang City, Indonesia

Abstract

An effective urban drainage system is the primary key to overcoming the risk of flooding due to high rainfall intensity. Tempe District, Wajo Regency, South Sulawesi, is one of the areas facing severe problems in its drainage system. The flooding in this area is caused by the inability of conventional drainage systems to handle high surface water runoff, especially during periods of intense rain. This research introduces a new approach to sustainable drainage systems by applying the infiltration well technique. The analysis was carried out by considering the infiltration well parameters, such as a depth of 3 m, a radius of 0.6 m, and a soil permeability of 5 x 10-5 m/s. This infiltration well was implemented in the upstream subcatchment area of the Sengkang City primary channel. The results of the analysis show that the use of infiltration wells can produce a significant positive impact in reducing flood risk. In a five-year return period, the flood volume can be reduced by 12.15 x 103 m3; in a 10-year return period, the volume reduction reaches 13.16 x 103 m3. Although the effectiveness of infiltration wells is limited to 9% and 6% for each return period, this approach significantly contributes to minimizing the impact of flooding in affected areas. Hopefully, these findings can contribute to planning and managing urban water systems, especially in areas vulnerable to flood risk.

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