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The Japanese Experience in Integrated Urban Flood Risk Management Knowledge Note 2: Planning and Prioritizing Urban Flood Risk Management Investments Ii

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The Japanese Experience in Integrated Urban Flood Risk Management Knowledge Note 2: Planning and Prioritizing Urban Flood Risk Management Investments Ii Public Disclosure Authorized Public Disclosure Authorized Public Disclosure Authorized Learning from Japan’s Experience in Integrated Urban Flood Risk Management: A Series of Knowledge Notes Public Disclosure Authorized Knowledge Note 2: Planning and Prioritizing Urban Flood Risk Management Investments ©2019 The World Bank International Bank for Reconstruction and Development The World Bank Group 1818 H Street NW, Washington, DC 20433 USA October 2019 DISCLAIMER This work is a product of the staff of The World Bank with external contributions. The findings, interpretations, and conclusions expressed in this work do not necessarily reflect the views of The World Bank, its Board of Executive Directors, or the governments they represent. The World Bank does not guarantee the accuracy of the data included in this work. The boundaries, colors, denominations, and other information shown on any map in this work do not imply any judgment on the part of The World Bank concerning the legal status of any territory or the endorsement or acceptance of such boundaries. The report reflects information available up to June 30, 2019. RIGHTS AND PERMISSIONS The material in this work is subject to copyright. Because The World Bank encourages dissemination of its knowledge, this work may be reproduced, in whole or in part, for noncommercial purposes as long as full attribution to this work is given. Any queries on rights and licenses, including subsidiary rights, should be addressed to World Bank Publications, The World Bank Group, 1818 H Street NW, Washington, DC 20433, USA; e-mail: [email protected]. CITATION Please cite this series of knowledge notes and/or its individual elements as follows: World Bank. 2019. “Learning from Japan’s Experience in Integrated Urban Flood Risk Management: A Series of Knowledge Notes.” World Bank, Washington, D.C. World Bank. 2019. “Learning from Japan’s Experience in Integrated Urban Flood Risk Management: A Series of Knowledge Notes—Knowledge Note 1: Assessing and Communicating Urban Flood Risk.” World Bank, Washington, D.C. World Bank. 2019. “Learning from Japan’s Experience in Integrated Urban Flood Risk Management: A Series of Knowledge Notes—Knowledge Note 2: Planning and Prioritizing Urban Flood Risk Management Investments.” World Bank, Washington, D.C. World Bank. 2019. “Learning from Japan’s Experience in Integrated Urban Flood Risk Management: A Series of Knowledge Notes—Knowledge Note 3: Designing and Implementing Urban Flood Risk Management Investments.” World Bank, Washington, D.C. World Bank. 2019. “Learning from Japan’s Experience in Integrated Urban Flood Risk Management: A Series of Knowledge Notes—Knowledge Note 4: Operating and Maintaining Urban Flood Risk Management Investments.” World Bank, Washington, D.C. World Bank. 2019. “Learning from Japan’s Experience in Integrated Urban Flood Risk Management: A Series of Knowledge Notes—Appendix: Case Studies in Integrated Urban Flood Risk Management in Japan.” World Bank, Washington, D.C. Knowledge Note 2: Planning and Prioritizing Urban Flood Risk Management Investments i ACKNOWLEDGEMENTS The four-part series “Learning from Japan’s Experience in Integrated Urban Flood Risk Management: A Series of Knowledge Notes” was prepared by a World Bank team led by Jolanta Kryspin-Watson, and comprising Shoko Takemoto, Zuzana Stanton-Geddes, Kenya Endo, and Masatsugu Takamatsu. Primary and secondary data gathering, and research, was conducted by Washington CORE and Yachiyo Engineering Co., Ltd. The four reports benefited from additional research and contributions by Jia Wen Hoe, Sayaka Yoda, Toshihiro Sonoda, Alex Keeley, Tomoki Takebayashi, Thimali Thanuja Pathirana Batuwita Pathiranage, and Chinami Yamagami; and peer review by Vivien Deparday, Keiko Saito, Ryoji Takahashi, Bontje Marie Zangerling, Srinivasa Rao Podipireddy, Dixi Mengote-Quah, Dzung Huy Nguyen, and Camilo Lombana Cordoba. The team is also grateful for the support of Mika Iwasaki, Luis Tineo, Reiko Udagawa, and Haruko Nakamatsu. The Knowledge Notes were developed with valuable contributions and guidance from numerous Japanese professionals and experts on integrated urban flood risk management. These include Professor Hiroaki Furumai, the University of Tokyo; Arata Ichihashi, Tokyo Metropolitan Research Institute for Environmental Protection; Michiru Sasagawa, Rain City Support and People for Rainwater; Nobuyuki Tsuchiya, Japan Riverfront Research Center; Shinji Nishimura, Urban Renaissance Agency (UR); Keiji Takeda, UR; Mikio Ishiwatari, Japan International Cooperation Agency (JICA); Miki Inaoka, JICA; Tomoki Matsumura, Ministry of Land, Infrastructure, Transport and Tourism (MLIT); Akito Kinoshita, MLIT; Takuji Nakazato; Chikao Okuda, Tokyo Metropolitan Government; Professor Takanori Fukuoka, Tokyo University of Agriculture; Yorikazu Kitae, Development Bank of Japan (DBJ); Tomohiro Ishii, Yokohama City; Minato-Mirai 21 Promotion Division, Urban Development Bureau, Yokohama City; Environmental Planning Bureau, Yokohama City; and Shoji Takemoto, Kobe City. Editorial services were provided by Fayre Makeig and Lisa Ferraro Parmelee. Kenya Endo designed the report. The Knowledge Notes were prepared under the auspices of the Urban Floods Community of Practice (UFCOP). UFCOP is a global knowledge initiative led by the World Bank with support from the Global Facility for Disaster Reduction and Recovery (GFDRR) and others. The Knowledge Notes were developed with the financial support of the Japan–World Bank Program for Mainstreaming Disaster Risk Management in Developing Countries, which is financed by the Government of Japan and receives technical support from the World Bank Tokyo Disaster Risk Management Hub. Cover Image: The Shibaura wastewater treatment plant in Minato Ward, Tokyo. This sewerage water detention facility integrates significant flood risk management functions with multipurpose urban amenities such as public green spaces, recreational facilities, and new commercial high-rises. (Photo Credit: Kenya Endo) Learning from Japan’s Experience in Integrated Urban Flood Risk Management Development of Knowledge Notes: The Japanese Experience in Integrated Urban Flood Risk Management Knowledge Note 2: Planning and Prioritizing Urban Flood Risk Management Investments ii Draft Knowledge Notes Knowledge Note 2: Urban Flood Risk Investment Planning and Prioritization Table of Contents 1. Summary 1 2. Urban Flood Risk Management in Japan: Evolution and Stakeholders 3 2.1 The Evolution of Urban Flood Risk Management in Japan 3 2.2 Institutional Arrangements and Key Stakeholders in Urban Flood Risk Management in Japan 4 2.3 City-Level Flood Management 7 Considering Change and Uncertainty 8 3. Planning and Prioritizing Investments in Urban Flood Risk Management 10 Step 1: Goal Setting 10 Step 2: Integrated Planning and Prioritization 12 Step 3: Consensus Building and Responsibility Sharing 16 4. Case Studies 18 4.1 Case of Tokyo Metropolitan Government 18 Context 18 Evolution of IUFRM Planning in TMG 19 Step 1: Goal Setting 21 Step 2: Integrated Planning and Prioritization 22 Step 3: Consensus Building and Responsibility Sharing 25 Future Challenges 26 4.2 Case of Shiga Prefecture 26 Context 26 Step 1: Goal Setting 27 Step 2: Integrated Planning and Prioritization 28 Step 3: Consensus Building and Responsibility Sharing 30 Future Challenges 31 4.3 Case of Setagaya Ward 31 Context 31 Step 1: Goal Setting 32 Step 2: Integrated Planning and Prioritization 33 Step 3: Consensus Building and Responsibility Sharing 36 Future Challenges and Next Steps 38 5. Lessons Learned and Key Takeaways 39 Step 1: Goal Setting 40 Step 2: Integrated Planning and Prioritization 40 Step 3: Consensus Building and Responsibility Sharing 41 6. References 42 Learning from Japan’s Experience in Integrated Urban Flood Risk Management Knowledge Note 2: Planning and Prioritizing Urban Flood Risk Management Investments iii List of Figures Figure 1. Share of Total Flood Damage Due to River and Surface Water Floods, 1997–2006 8 Figure 2. Relationship and Effects of Climate Change, Urbanization, and Increasing Flood Damages 9 Figure 3. Timeline of Plans for Managing the Risk of Heavy Rain in Tokyo 19 Figure 4. Heavy Rain Management Goals and Sectoral Allocation in Tokyo 22 Figure 5. Types of Heavy Rain Measures Identified in the Tokyo Basic Policy for Heavy Rain Management (updated (updated 2014) 23 Figure 6. Criteria for Designating Priority Areas for Flood Risk Management in Tokyo 23 Figure 7. Watersheds and Districts Prioritized for Intensified Heavy Rain Measures in Tokyo, 2014 25 Figure 8. Integrating Flood Risk Assessments into Land Use Plans, Shiga Prefecture 30 Figure 9. How Setagaya Ward’s Heavy Rain Basic Policy and Action Plan Connects with Other Legal and Policy and Policy Frameworks 32 Figure 10. Setagaya Ward’s Progress toward Watershed-based Flood Management Targets 33 Figure 11. Setagaya Ward’s Heavy Rain Measures and Responsible Stakeholders 37 List of Tables Table 1. Sharing Responsibility for the Integrated Management of Flood Risk in Japan 6 Table 2. Overview of Flood Damages Caused by Heavy Rain in July 2018 8 Table 3. Future Rainfall Levels, Flood Frequency, and Probability of Flood Occurrence According to Different Climate to Different Climate Change Scenarios 9 Table 4. Urban Flood Risk Management Goals and Decision-Making Tools and Processes in Tokyo and Shiga 11 Table 5. Major Stakeholders and Role Sharing, by Type of Flood Risk 17 Table 6. Evolution of Tokyo’s Flood Management Goals 21 Table 7. Sharing
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