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ASSESSING LONG-TERM ECONOMIC VIABILITY: A CASE STUDY OF FLOOD PROTECTION INVESTMENT

Author(s): SS-3-4: Promoting Investment in Disaster Risk Reduction and Climate Change Adaptation - Policies and Innovative Approaches for a Resilient Future
XVIII IWRA World Water Congress Beijing China 2023
Sub-theme 3: Building Resilience for Disaster Prevention and Mitigation
Author(s): Mikio Ishiwatari, PhD - Japan International Cooperation Agency
Oral: PDF

Abstract

CONTENTS

  1. Introduction
  2. Economic benefits of flood protection in Sendai City
  3. How to share benefits and costs among multistakeholders

Conclusion

Proposed methodology of economic analysis for long-term investment in flood protection in the past at river basin scale.

For assessing the past and future benefits consider effects of past urbanization and inflation.

Natorigawa River basin including Sendai City, Japan
70 years investment was efficient with cost-benefit ratio of 6.1

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