Metropolitan Area Outer Underground Discharge Channel
Sector: Water Supply and Storage • Location: Saitama, Tokyo, Japan
Source: Bloomberg
The world's largest underground flood tunnel system built in Saitama, just outside Tokyo, Japan. It protects surrounding areas from floods by diverting water underground and pushing it out into a nearby river, reducing flood damage by 90%.
- Status
- Closed
- Sector
- Water Supply and Storage, Tunnel
- Location
- Saitama, Tokyo, Japan
- Updated
- 22 Jul 2026
- Source
- Bloomberg
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Project Information
Participants
| Not available for this record. |
Status
Original status | completed |
Taiyo status | Closed |
Taiyo last update | 2026-07-22 |
Contact
| Not available for this record. |
Description
Description | The world's largest underground flood tunnel system built in Saitama, just outside Tokyo, Japan. It protects surrounding areas from floods by diverting water underground and pushing it out into a nearby river, reducing flood damage by 90%. |
Original sector | Infrastructure |
Budget |
Location
Country | Japan |
State | Tokyo |
City | Saitama |
Source
Source | Bloomberg |
URL |
More Details
Record type | Project |
Sector | Water Supply and Storage, Tunnel |
Article published date | 2026-05-23 |
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