Data Summary: Kojima-ko (Lake Kojima)
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| Site Name |
ASI-37 |
Photo : A. Kurata |
| Lake Name |
Kojima-ko (Lake Kojima) |
| State |
Okayama Prefecture |
| Country |
Japan |
| Latitude |
34:3N |
| Longitude |
133:5E |
| Altitude [m] |
0.5 |
| Surface area [m2] |
10,880,000 |
Volume [m3] |
17,700,000 |
| Maximum depth [m] |
9 |
Mean depth [m] |
1.6 |
| Water level control |
Regulated |
Normal range of annual water level fluctuation [m] |
2.4 |
| Length of shoreline [m] |
27,500 |
Residence time [yr] |
0.068 |
| Catchment area [m2] |
532,750,000 |
Hours of bright Sunshine [hr yr-1] |
2,264 |
| Solar radiation [MJ m-2 day-1] |
- |
Freezing period |
- |
| Mixing type |
- |
Annual fish catch [t yr-1] |
345 |
| Total N loading [t yr-1] |
469.1 |
Total P loading [t yr-1] |
62.1 |
| Population |
579,865 |
Population density of catchment area [person km-2] |
1,088 |
WATER USAGE
| Domestic water usage [m3 sec-1] |
- |
Irigation water usage [m3 sec-1] |
1.33 |
| Industrial water usage [m3 sec-1] |
- |
Power generation usage [m3 sec-1] |
- |
LAND USE
| Natural landscape [%] |
38 |
Agricultural land [%] |
31.6 |
Others [%] |
30.4 |
| Siltation |
None |
Toxic Contamination |
Not Serious |
| Eutrophication |
Serious |
Acidification |
None |
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