Evaluation of the Combined Effects of Consecutive Open Levees in Kitagawa River and Functional Improvement by Modifying Opening Heights

Key Points

• The research aims to evaluate the flood control effects of increasing the opening height of levees to reduce flooding frequency in agricultural fields.
• Conducted numerical simulations assessing flood control and debris flow damage.
• Proposed increasing the opening height of levees to alleviate flooding.
• Analyzed the impact of levee height changes on water levels.
• Increased opening height showed greater flood control effectiveness than current levels.
• Reduction in debris flow damage was observed with the proposed modifications.
• Higher water level differences between interior and exterior land increased risks of piping.