Data Summary: Tega-numa (Lake Tega)
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| Site Name |
ASI-28 |
Photo : A. Kurata |
| Lake Name |
Tega-numa (Lake Tega) |
| State |
Chiba Prefecture |
| Country |
Japan |
| Latitude |
35:5N |
| Longitude |
140:1E |
| Altitude [m] |
- |
| Surface area [m2] |
6,500,000 |
Volume [m3] |
5,600,000 |
| Maximum depth [m] |
3.8 |
Mean depth [m] |
0.86 |
| Water level control |
Regulated |
Normal range of annual water level fluctuation [m] |
- |
| Length of shoreline [m] |
38,000 |
Residence time [yr] |
0.07 |
| Catchment area [m2] |
150,200,000 |
Hours of bright Sunshine [hr yr-1] |
2,370 |
| Solar radiation [MJ m-2 day-1] |
- |
Freezing period |
- |
| Mixing type |
Polymictic |
Annual fish catch [t yr-1] |
440 |
| Total N loading [t yr-1] |
863.1 |
Total P loading [t yr-1] |
111.9 |
| Population |
399,050 |
Population density of catchment area [person km-2] |
2,657 |
WATER USAGE
| Domestic water usage [m3 sec-1] |
- |
Irigation water usage [m3 sec-1] |
1.597222222 |
| Industrial water usage [m3 sec-1] |
- |
Power generation usage [m3 sec-1] |
- |
LAND USE
| Natural landscape [%] |
26.4 |
Agricultural land [%] |
34.4 |
Others [%] |
39.3 |
| Siltation |
Serious |
Toxic Contamination |
- |
| Eutrophication |
Serious |
Acidification |
None |
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