Integrated Flood Risk Matrix for Priority Determination Among Flood Impact Factors in Urban Drainage Systems

ABSTRACT Global climate change exacerbates urban floods, making their projection into future uncertainties more challenging. Identifying flood impact factors in urban areas is necessary for effective urban flood risk management. However, studies investigating the priority determination among flood impact factors based on an integrated decision‐making tool are limited. This study proposes an integrated flood risk matrix combining two methods. The proposed tool comprises quantitative and qualitative approaches to comprehensively investigate the priorities among flood impact factors. The quantitative approach examines the “uncertainty,” and the qualitative approach investigates the “importance”. The proposed tool, combined with two measures, performs priority determination with respect to hydrological and hydraulic flood risk factors. Pipe roughness and curve number were identified as the key drivers (i.e., high priority). In addition, the proposed matrix demonstrated how priority determination among flood impact factors can help improve decision‐making for urban infrastructure projects. This study improves knowledge of project decision‐making by providing a mechanism that integrates two different methods while providing reliable results.