Data Summary: Ogochi-damu-ko (Okutama Reservoir)
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| Site Name |
ASI-24 |
Photo : Tokyo Metropolitan Government |
| Lake Name |
Ogochi-damu-ko (Okutama Reservoir) |
| State |
Tokyo |
| Country |
Japan |
| Latitude |
35:5N |
| Longitude |
139:1E |
| Altitude [m] |
550 |
| Surface area [m2] |
4,250,000 |
Volume [m3] |
189,100,000 |
| Maximum depth [m] |
142.5 |
Mean depth [m] |
44.4 |
| Water level control |
Regulated |
Normal range of annual water level fluctuation [m] |
4 |
| Length of shoreline [m] |
45,400 |
Residence time [yr] |
0.68 |
| Catchment area [m2] |
259,000,000 |
Hours of bright Sunshine [hr yr-1] |
- |
| Solar radiation [MJ m-2 day-1] |
11.4 |
Freezing period |
None |
| Mixing type |
Monomictic |
Annual fish catch [t yr-1] |
- |
| Total N loading [t yr-1] |
78.73 |
Total P loading [t yr-1] |
4.65 |
| Population |
3,258 |
Population density of catchment area [person km-2] |
12.4 |
WATER USAGE
| Domestic water usage [m3 sec-1] |
7.8 |
Irigation water usage [m3 sec-1] |
0 |
| Industrial water usage [m3 sec-1] |
0 |
Power generation usage [m3 sec-1] |
7.7 |
LAND USE
| Natural landscape [%] |
94.6 |
Agricultural land [%] |
1.7 |
Others [%] |
3.5 |
| Siltation |
None |
Toxic Contamination |
None |
| Eutrophication |
Serious |
Acidification |
None |
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