Japan Water Information System (JWIS) - MLIT
Japan's Ministry of Land, Infrastructure, Transport and Tourism hydrological database providing river water level, discharge, dam and radar rainfall observations from ~1,900+ water level/discharge stations nationwide, downloadable as CSV.
www1.river.go.jp
At a glance
- Region
- Japan (Asia)
- Coverage
- Japan
- Access
- Free
- Category
- Government
- Last updated
- 2026
What's inside
- Water level
- Discharge
- Rainfall
- Dam
Terms explained
What you can do with it
Typical work that data of this type supports.
- 01
Storage tracking
Follow storage and releases through the season.
Because it has: Water level
- 02
Change over time
See how lakes and wetlands have grown or shrunk.
- 03
Design flows
Estimate 1-in-50 and 1-in-100 year floods for bridges, culverts and spillways.
Because it has: Discharge
Where AI adds value
Ideas for machine learning and AI agents built on this kind of data.
- 01
Storage from space
Estimate volume from satellite water area and altimetry.
- 02
Release decisions
Optimise releases against inflow forecasts.
- 03
Flow forecasting
Train LSTM-style models on past records to forecast river levels and flow days ahead.
Related water data
- Japan Water Agency Real-time DataAsia | Free
- China Hydrology Data Project (Oberlin College)Asia | Free
- Hydrological Dataset for Ganges Basin 2000-2022 (Mendeley Data)Asia | Free
- Pakistan Flood Forecasting Division (FFD) DashboardAsia | Free
- RISE Sri Lanka - Full River LevelsAsia | Free
- Royal Irrigation Department Flood/Water Monitoring (Thailand)Asia | Free
Find more water data
Search and compare 1,900+ water data sources by region, type and access.