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- Yokohama City Sewerage Inundation Countermeasures Plan
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Yokohama City Sewerage Inundation Countermeasures Plan
[Preliminary disaster prevention using data]
Last updated on March 28, 2025.
What is the Yokohama City Sewerage Inundation Countermeasures Plan?
With the aim of further promoting the development of resilient towns that are resistant to rain based on the progress of inundation countermeasures and the effects of climate change, a new perspective of pre-disaster prevention has been adopted, and targets and measures for inundation countermeasures by sewerage in the future This is a master plan for inundation countermeasures that defines how to proceed.
Yokohama City Sewerage Inundation Countermeasures Plan
Composition of the Plan
1 Position of the Plan
2 Current status and issues of inundation countermeasures
- Current status of flood countermeasures
- Issues for flood control
3 Future Inundation Countermeasures
4 Disaster Prevention Measures
- Review of target maintenance levels (targets to prevent flooding)
- Promotion of "Preliminary Disaster Prevention"
- Areas subject to maintenance in this plan
- Selection of maintenance areas
5 antidisaster measure
- Targets to prevent serious damage (100mm/hr, general prevention of flood above floor level)
- Life-saving goals (153mm/hr, secure safe evacuation)
Download
Area map to be maintained
The maintenance of sewerage facilities will be prioritized from areas where the “inundation assumption” is wide and deep, the “inundation effect” is large, and the risk of flooding is high.
In this plan, we aim to complete the development of 16 trunk lines and 252 districts, which are responsible for the area with the highest flood risk as a basin in approximately 20 years.
※The area targeted for maintenance divided based on the flow of rainwater is colored, but inundation is not expected in the entire area of each area.
Distribution of booklets
Plan booklets are distributed at the following locations.
- Sewerage and Rivers Bureau Management Promotion Section (24th floor of City Hall)
- Citizen Information Center (3rd floor of City Hall)
- Each ward office Public Relations Section
Recruitment of citizen opinion about draft
During period from December 24, 2024 to February 14, 2025, we carried out citizen opinion offer about plan draft.
Thank you very much for your feedback.
Inundation Countermeasures Study Group based on Climate Change
In formulating a new inundation countermeasure plan, the “Inundation Countermeasures Study Group Based on Climate Change” discussed the issues that form the framework of the plan, such as the goals of inundation countermeasures and the concept of maintenance priority.
Committee members
| Name (furigana) | Affiliation | |
|---|---|---|
| Committee members | Hiroyuki Kato | Project Associate Professor, Graduate School of Engineering, The University of Tokyo (former Director, Sewerage Business Division, Ministry of Land, Infrastructure, Transport and Tourism) |
| Expert Committee Members | ISHIKAWA Eiko | Associate Professor, Department of Urban Studies, Faculty of Liberal Arts, Yokohama City University |
| Expert Committee Members | Hiroaki Morita | Professor, Department of Civil Engineering, Faculty of Engineering, Nihon University |
Term of office of committee members
From April 28, 2023 to late November, 2023
Status of the Study Group
| Schedule | Major items to be discussed | |
|---|---|---|
| 1st Study Group | June 5, 2023 | Targets for flood control [Setting disaster prevention targets (targets to prevent flooding)] In light of the impact of climate change, we will strengthen rainfall (target development level) targeted for facility development by 1.1 times.
[Setting reduce disaster damage Targets] Targets to prevent serious damage: 100mm/hr, general prevention of flood above floor level To save lives: 153mm/hr, ensuring safe evacuation |
| 2nd Study Group | July 5, 2023 | Concept of maintenance priority
|
| 3rd Study Group | August 24, 2023 | Concept of maintenance priority
|
| The 4th Study Group | November 29, 2023 | Items described in the Inundation Countermeasures Plan (draft) |
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Inquiries to this page
Sewerage and Rivers Bureau Management Promotion Department Management Promotion Section (Plan)
Phone: 045-671-2838
Phone: 045-671-2838
Fax: 045-664-0571
E-Mail address [email protected]
Page ID: 390-093-100
