Yokohama City River Maintenance Plan

　In Yokohama City, rivers and waterways are indispensable as an important urban infrastructure, such as moisturizing daily citizens' lives and protecting the city from floods during heavy rains. In light of recent changes in social conditions, such as the intensification of rainfall, aging of facilities, and the progress of digital technologies such as AI analysis, we will further strengthen cooperation with the local community and steadily promote our efforts so far, Aiming for efficiency, we have newly formulated the "Yokohama City River Maintenance Plan", which systematically summarizes the contents related to maintenance.

• Yokohama-shi river maintenance plan (PDF: 19,968KB)

• Cover to Table of Contents (PDF: 957KB)
• Part 1 Basic matters of the plan (PDF: 3,607KB)
• Part 2 Specific matters of the plan at the facility (river edition) (PDF: 3,411KB)
• Part 2 Specific matters of the plan in the facility (waterway) (PDF: 2,925KB)
• Specific matters of the plan in Part 2 facilities (rainwater runoff control facilities) (PDF: 2,451KB)
• Materials at the end of the book-1 Glossary (PDF: 1,029KB)
• Documents at the end of the book-2 Casebook (PDF: 6,755KB)

Yokohama-shi river maintenance plan (commentary version)

• Rivers　　　　　　　(under preparation)
• Waterways　　　　　　　(under preparation)
• Rainwater runoff control facility (under preparation)

※It will be posted after completion.

　Based on opinions from citizens, etc., the content was enhanced.
　Specifically, in addition to adding the viewpoint of biodiversity to the maintenance goals, illustrations, diagrams, photographs, etc. were added to the glossary and casebooks to make technical terms easier to understand.

• Yokohama-shi river maintenance plan (original draft) (PDF: 20,220KB)

　About Yokohama-shi river maintenance plan (draft), we carried out citizen opinion offer from September 25, 2024 to October 25, 2024 and had 72 people, 126 opinions. Thank you very much for your valuable opinions and suggestions regarding the maintenance and management of rivers from many citizens.

• About conduct result of citizen opinion offer about Yokohama-shi river maintenance plan (draft) (PDF: 175KB)
• Summary of opinion that we had and way of thinking of Motoichi for opinion (PDF: 408KB)
• Yokohama-shi river maintenance plan (draft) leaflet (PDF: 3,816KB)
• Yokohama-shi river maintenance plan (draft) summary version (PDF: 2,910KB)
• Yokohama-shi river maintenance plan (draft) (PDF: 12,334KB)

Link: Click here for detailed plans for each facility (action plan)