円山川の超過洪水時におけるリスク軽減のための計画的氾濫に関する研究

Abstract

This study examines a flood control countermeasure, premediated overflow, to increasing external flood forces. It's a flood mitigation measure to effectively use available low risk areas as floodplains under considering topography and property distribution in a watershed. Areas and flood retention volumes are determined by uniformly lowering existing levee elevations. After choosing appropriate inundation areas, their amount of flood damages and risk reduction effects in downstream are both calculated by changing the height of overflow levee. The results indicate that suitable design of premediated overflow could reduce total flood damages to the entire watershed.