Tokyo Metropolitan - Flood Control Integrated Information System (Bureau of Construction River Division)Provide

As of 2026/07/15 15:49

Storage ratio of regulating reservoirStorage ratio of regulating reservoir

Kannana regulating reservoir

Time unit
1 minute
10 minutes
1 hour
Regulating reservoir 10 minutes

Legend

Storage ratio
100% storage ratio 100% storage ratio
80% storage ratio 80% storage ratio
50% storage ratio 50% storage ratio
Storage ratio Storage ratio
No line Stopped/missed
Regulating reservoir cross-section view
100% storage ratio is exceeded 100% storage ratio is exceeded
80% storage ratio is exceeded 80% storage ratio is exceeded
50% storage ratio is exceeded 50% storage ratio is exceeded
Storage started Storage started
Normal Normal period
Observation data
欠測 Missing
Blank Unmeasure
Observation info *¹
Current storage ratio (%)
Storage start date
Reservoir info
Total storage (m3) 540,000

Detailed data

Observation date & time Storage ratio
11:50 0
12:00 0
12:10 0
12:20 0
12:30 0
12:40 0
12:50 0
13:00 0
13:10 0
13:20 0
13:30 0
13:40 0
13:50 0
14:00 0
14:10 0
14:20 0
14:30 0
14:40 0
14:50 0
15:00 0
15:10 0
15:20 0
15:30 0
15:40 0
  • *¹ Storage ratio and storage start time are provisional values.
  • *² The inflow into the regulating reservoir mainly contributes to lowering of the river water level downstream from the regulating reservoir.
     In the event of a heavy rainfall, please follow evacuation information from the local government and take appropriate evacuation actions by referring to river flooding and water level information.
  • *³ Stored water is promptly drained to prepare for the next rainfall while checking river, weather and other conditions.