Environmentally Considered Runaway Control (Ecodrainage) in Urban Areas (Case Study of Jatimulyo Village, Malang City)

Abstract

Land use changes in urban areas have a significant impact on increasing surface water runoff. Jatimulyo Village, Malang City, is one of the densely populated areas that is prone to flooding during the rainy season. This study aims to plan rainwater runoff control using an ecodrainage approach. The methods used include hydrological analysis with Log Pearson III distribution to calculate the design rainfall for a 5-year return period, as well as a rational method to calculate the runoff discharge. The results of the analysis show that the capacity of the existing channel is unable to accommodate the peak discharge of 1.103 m³/second. Infiltration wells are applied as ecodrainage components, and the calculation results show that the discharge after ecodrainage application decreases to 0.556 m³/second, or reduces runoff by 49.59%. Therefore, ecodrainage has proven effective in reducing the volume of surface runoff and can be a sustainable solution for flood-prone areas in urban areas.