Basin | Northern Lake | Southern Lake | Total |
---|---|---|---|
Surface area [km2] | 616 | 58 | 674 |
Volume [km3] | 27.3 | 0.2 | 27.5 |
Maximum depth [m] | 104 | 8 | 104 |
Mean depth [m] | 44 | 3.5 | 41 |
Normal range of annual water level fluctuation (regulated)[m] |
- | - | 1 |
Length of shoreline [km] | - | - | 235 |
Residence time [yr] | 5.5 | 0.04 | 5.5 |
Catchment area [km2] | - | - | 3,174 |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann. | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean temp. [deg C] | 3.2 | 3.5 | 6.2 | 11.7 | 16.6 | 20.8 | 25.1 | 26.4 | 22.3 | 16.4 | 10.8 | 5.9 | 14.1 |
Precipitation [mm] | 110 | 106 | 119 | 154 | 149 | 224 | 235 | 150 | 206 | 117 | 85 | 86 | 1,741 |
Station 1 (N. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 8.5 | 7.0 | 6.4 | 8.6 | 15.1 | 19.1 | 22.2 | 26.6 | 27.2 | 22.7 | 16.3 | 12.6 |
5 | 8.5 | 6.8 | 6.3 | 8.1 | 13.2 | 18.0 | 21.5 | 26.4 | 26.9 | 22.1 | 16.4 | 12.5 |
10 | 8.5 | 6.8 | 6.3 | 7.8 | 11.7 | 15.7 | 20.2 | 24.0 | 26.0 | 22.0 | 16.3 | 12.4 |
15 | 8.5 | 6.8 | 6.2 | 7.6 | 10.0 | 13.5 | 16.4 | 18.9 | 19.2 | 20.1 | 16.2 | 12.4 |
20 | 8.5 | 6.8 | 6.2 | 7.6 | 9.1 | 11.2 | 12.7 | 15.7 | 14.3 | 15.8 | 16.0 | 12.4 |
30 | 8.5 | 6.8 | 6.2 | 7.3 | 8.2 | 8.6 | 9.5 | 10.5 | 10.1 | 10.2 | 9.9 | 10.4 |
40 | 8.4 | 6.8 | 6.2 | 7.1 | 7.5 | 7.7 | 8.3 | 8.5 | 8.4 | 8.7 | 8.4 | 9.0 |
60 | 7.8 | 6.7 | 6.2 | 6.9 | 7.0 | 7.2 | 7.3 | 7.3 | 7.4 | 7.8 | 7.3 | 8.0 |
80 | 7.4 | 6.6 | 6.2 | 6.7 | 6.6 | 6.8 | 6.9 | 6.9 | 6.9 | 7.3 | 7.0 | 7.2 |
bottom | 7.2 | 6.6 | 6.2 | 6.6 | 6.4 | 6.6 | 6.8 | 6.6 | 6.8 | 7.0 | 6.8 | 7.0 |
Station 2 (S. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 5.5 | 5.5 | 5.8 | 11.8 | 17.8 | 22.1 | 23.5 | 27.5 | 27.8 | 22.8 | 15.6 | 9.9 |
bottom | 5.3 | 5.5 | 5.7 | 11.7 | 16.1 | 21.5 | 23.2 | 26.7 | 27.4 | 22.1 | 15.2 | 9.8 |
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Station 1 | 8.3 | 8.7 | 7.6 | 5.7 | 4.2 | 5.5 | 4.6 | 5.3 | 6.1 | 5.5 | 7.7 | 7.1 |
Station 2 | 2.0 | 2.4 | 1.5 | 2.4 | 2.1 | 2.1 | 2.4 | 2.4 | 1.8 | 1.5 | 1.7 | 1.7 |
Station 1 (N. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 7.4 | 7.4 | 7.4 | 7.7 | 8.2 | 8.2 | 8.7 | 8.9 | 8.7 | 8.1 | 7.7 | 7.6 |
5 | 7.7 | 7.5 | 7.4 | 7.7 | 8.2 | 8.3 | 8.7 | 9.0 | 8.7 | 8.1 | 7.7 | 7.6 |
10 | 7.4 | 7.4 | 7.4 | 7.7 | 8.1 | 8.2 | 8.3 | 8.7 | 8.5 | 8.1 | 7.7 | 7.6 |
15 | 7.4 | 7.5 | 7.4 | 7.7 | 7.8 | 7.8 | 7.8 | 7.6 | 7.6 | 7.6 | 7.7 | 7.6 |
20 | 7.4 | 7.4 | 7.4 | 7.7 | 7.7 | 7.5 | 7.5 | 7.5 | 7.4 | 7.3 | 7.6 | 7.5 |
30 | 7.4 | 7.5 | 7.4 | 7.6 | 7.6 | 7.4 | 7.4 | 7.3 | 7.3 | 7.2 | 7.3 | 7.3 |
40 | 7.4 | 7.5 | 7.4 | 7.6 | 7.5 | 7.4 | 7.7 | 7.3 | 7.3 | 7.2 | 7.1 | 7.1 |
60 | 7.2 | 7.4 | 7.7 | 7.6 | 7.6 | 7.4 | 7.4 | 7.3 | 7.3 | 7.2 | 7.0 | 7.0 |
80 | 7.0 | 7.4 | 7.3 | 7.6 | 7.5 | 7.4 | 7.4 | 7.1 | 7.1 | 7.1 | 6.9 | 6.9 |
bottom | 6.9 | 7.4 | 7.7 | 7.5 | 7.4 | 7.3 | 7.2 | 7.0 | 7.0 | 7.0 | 6.9 | 6.9 |
Station 2 (S. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 7.6 | 7.6 | 7.5 | 8.0 | 8.7 | 8.9 | 8.5 | 8.8 | 8.7 | 8.8 | 8.0 | 7.8 |
bottom | 7.6 | 7.6 | 7.5 | 8.1 | 8.6 | 8.8 | 8.6 | 8.8 | 8.7 | 8.6 | 8.0 | 7.7 |
Station 1*1, 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 0.7 | 1.1 | 0.9 | 1.2 | 1.2 | 0.5 | 1.7 | 1.3 | 1.0 | 1.2 | 0.9 | 1.2 |
5 | 1.1 | 1.6 | 1.3 | 1.3 | 1.5 | 1.2 | 2.1 | 1.8 | 1.3 | 1.6 | 1.0 | 1.1 |
10 | 0.7 | 1.0 | 1.1 | 1.2 | 1.3 | 1.1 | 1.9 | 2.1 | 1.0 | 1.3 | 1.0 | 1.2 |
15 | 0.6 | 0.8 | 1.2 | 1.2 | 1.3 | 0.9 | 1.4 | 1.6 | 1.1 | 1.2 | 1.0 | 1.2 |
20 | 0.8 | 0.7 | 1.0 | 1.3 | 1.2 | 0.5 | 1.1 | 1.0 | 0.8 | 0.7 | 0.9 | 1.2 |
30 | 0.7 | 0.8 | 1.1 | 1.2 | 1.0 | 0.6 | 0.6 | 0.8 | 0.4 | 0.6 | 0.6 | 0.9 |
40 | 0.8 | 0.8 | 1.0 | 1.3 | 1.1 | 0.5 | 0.6 | 0.5 | 0.3 | 0.4 | 0.4 | 0.6 |
60 | 0.5 | 1.1 | 1.1 | 1.3 | 1.0 | 0.4 | 0.6 | 0.4 | 0.2 | 0.4 | 0.3 | 0.3 |
80 | 0.5 | 0.9 | 0.8 | 1.5 | 1.4 | 0.7 | 0.7 | 0.6 | 0.3 | 0.6 | 0.4 | 0.4 |
bottom | 0.9 | 1.7 | 1.1 | 2.3 | 3.1 | 1.3 | 1.3 | 1.8 | 1.0 | 2.1 | 2.1 | 5.8 |
Station 2 (S. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 5.3 | 4.9 | 8.0 | 3.3 | 4.0 | 4.2 | 3.7 | 5.9 | 5.2 | 7.0 | 5.7 | 5.2 |
bottom | 4.7 | 4.8 | 7.8 | 3.4 | 3.7 | 4.5 | 4.7 | 6.5 | 5.9 | 8.0 | 6.3 | 5.8 |
Station 1 (N. Lake), 1981-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 10.2 | 10.5 | 10.8 | 11.1 | 10.7 | 9.4 | 9.3 | 8.8 | 7.9 | 8.4 | 9.2 | 9.8 |
5 | 9.9 | 10.7 | 10.9 | 11.0 | 11.1 | 10.0 | 9.9 | 8.6 | 8.2 | 8.4 | 9.4 | 9.7 |
10 | 9.9 | 10.7 | 11.0 | 11.0 | 11.0 | 10.0 | 9.1 | 8.4 | 8.0 | 8.2 | 9.3 | 9.6 |
15 | 9.9 | 10.6 | 11.0 | 11.0 | 10.8 | 9.9 | 8.8 | 6.9 | 6.3 | 6.8 | 9.1 | 9.7 |
20 | 9.9 | 10.5 | 10.9 | 11.1 | 10.5 | 9.8 | 8.9 | 7.2 | 7.0 | 6.2 | 8.9 | 9.6 |
30 | 9.9 | 10.5 | 11.0 | 10.9 | 10.6 | 10.0 | 9.3 | 8.4 | 7.8 | 7.4 | 7.4 | 8.1 |
40 | 9.6 | 10.4 | 10.8 | 10.9 | 10.4 | 10.1 | 9.7 | 8.9 | 8.5 | 7.9 | 7.3 | 7.6 |
60 | 7.6 | 10.4 | 10.8 | 10.8 | 10.5 | 10.2 | 10.0 | 9.1 | 9.1 | 8.1 | 7.0 | 7.3 |
80 | 6.7 | 9.6 | 10.7 | 10.4 | 10.4 | 10.1 | 9.8 | 8.9 | 8.2 | 7.1 | 5.7 | 6.1 |
botom | 5.6 | 9.6 | 10.0 | 10.2 | 9.8 | 9.0 | 8.3 | 6.5 | 5.1 | 3.1 | 3.2 | 4.0 |
Station 2 (S. Lake), 1982-1986 | ||||||||||||
Depth[m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 11.5 | 11.1 | 11.3 | 10.5 | 11.0 | 9.9 | 8.8 | 8.5 | 8.5 | 9.6 | 9.8 | 10.8 |
bottom | 11.3 | 11.0 | 11.4 | 10.5 | 11.0 | 9.5 | 8.9 | 8.4 | 7.8 | 8.9 | 9.8 | 10.7 |
Station 1 (N. Lake), 1982-1986 | ||||||||||||
Depth | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 1.7 | 1.6 | 1.6 | 1.5 | 1.8 | 2.2 | 2.6 | 2.3 | 2.6 | 2.3 | 2.0 | 1.9 |
5 | 1.9 | 1.6 | 1.7 | 1.6 | 1.8 | 2.2 | 2.7 | 2.6 | 2.4 | 2.6 | 2.0 | 2.0 |
10 | 1.8 | 1.7 | 1.5 | 1.6 | 1.6 | 2.1 | 2.5 | 2.3 | 2.4 | 2.3 | 2.0 | 2.0 |
15 | 1.8 | 1.6 | 1.6 | 1.5 | 1.6 | 1.9 | 2.0 | 2.0 | 2.1 | 2.1 | 2.0 | 1.9 |
20 | 1.8 | 1.5 | 1.5 | 1.4 | 1.4 | 1.9 | 1.8 | 1.8 | 1.8 | 1.8 | 1.9 | 1.9 |
30 | 1.8 | 1.6 | 1.5 | 1.5 | 1.3 | 1.6 | 1.6 | 1.5 | 1.4 | 1.7 | 1.4 | 1.7 |
40 | 1.8 | 1.6 | 1.5 | 1.4 | 1.4 | 1.6 | 1.4 | 1.4 | 1.3 | 1.6 | 1.4 | 1.5 |
60 | 1.5 | 1.6 | 1.6 | 1.4 | 1.3 | 1.4 | 1.3 | 1.4 | 1.4 | 1.3 | 1.3 | 1.5 |
80 | 1.5 | 1.5 | 1.5 | 1.4 | 1.4 | 1.5 | 1.4 | 1.4 | 1.3 | 1.5 | 1.4 | 1.5 |
bottom | 1.4 | 1.6 | 1.4 | 1.4 | 1.4 | 1.6 | 1.5 | 1.6 | 1.6 | 1.9 | 1.5 | 1.9 |
Station 2 (S. Lake), 1982-1986 | ||||||||||||
Depth | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 2.3 | 1.8 | 2.1 | 2.1 | 2.6 | 2.9 | 2.6 | 2.9 | 3.2 | 3.3 | 2.8 | 2.4 |
bottom | 2.3 | 2.0 | 2.1 | 2.1 | 2.8 | 3.2 | 2.6 | 2.9 | 3.3 | 3.4 | 2.9 | 2.5 |
Station 1 (N. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 2.8 | 2.3 | 2.5 | 1.7 | 4.7 | 2.5 | 7.2 | 4.8 | 4.4 | 6.3 | 5.6 | 6.4 |
5 | 2.9 | 2.3 | 2.8 | 2.9 | 6.5 | 3.3 | 8.7 | 5.6 | 4.9 | 6.9 | 6.3 | 6.8 |
10 | 2.9 | 2.2 | 2.8 | 2.9 | 4.2 | 3.6 | 8.6 | 9.7 | 5.6 | 7.1 | 5.9 | 6.3 |
15 | 2.9 | 2.2 | 2.6 | 2.9 | 3.1 | 3.5 | 5.4 | 7.1 | 5.4 | 6.2 | 6.0 | 6.2 |
20 | 2.9 | 2.1 | 2.7 | 2.9 | 2.6 | 3.1 | 3.0 | 3.9 | 3.8 | 4.1 | 5.7 | 6.0 |
30 | 2.7 | 2.1 | 2.5 | 2.6 | 1.8 | 1.5 | 1.2 | 1.6 | 1.6 | 1.3 | 1.7 | 3.4 |
40 | 2.5 | 2.0 | 2.5 | 2.6 | 1.5 | 1.0 | 0.7 | 0.8 | 0.9 | 0.7 | 0.7 | 1.0 |
60 | 1.1 | 1.9 | 2.7 | 2.4 | 1.5 | 0.7 | 0.6 | 0.3 | 0.5 | 0.4 | 0.5 | 0.4 |
80 | 0.5 | 1.7 | 2.7 | 2.4 | 1.9 | 0.8 | 0.6 | 0.4 | 0.6 | 0.4 | 0.4 | 0.3 |
bottom | 0.5 | 2.4 | 2.6 | 4.2 | 2.8 | 1.6 | 1.2 | 1.4 | 1.0 | 1.2 | 1.2 | 1.9 |
Station 2 (S. Lake), 1982-1986 | ||||||||||||
Depth | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 3.7 | 3.4 | 4.2 | 6.5 | 13.3 | 9.7 | 7.0 | 7.9 | 11.7 | 17.2 | 13.4 | 12.8 |
bottom | 4.0 | 3.6 | 4.3 | 7.2 | 14.9 | 10.9 | 8.8 | 8.5 | 14.3 | 20.9 | 14.2 | 12.7 |
Station 1 (N. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 0.01 | 0.01 | 0.01 | 0.00 | 0.01 | 0.01 | 0.01 | 0.00 | 0.01 | 0.00 | 0.01 | 0.01 |
5 | 0.01 | 0.01 | 0.01 | 0.00 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 |
10 | 0.01 | 0.01 | 0.01 | 0.00 | 0.01 | 0.01 | 0.02 | 0.01 | 0.00 | 0.01 | 0.00 | 0.01 |
15 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.02 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 |
20 | 0.01 | 0.01 | 0.00 | 0.00 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.01 | 0.00 | 0.01 |
30 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 |
40 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.02 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 |
60 | 0.00 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
80 | 0.00 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 |
bottom | 0.00 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.04 | 0.01 | 0.00 |
Station 2 (S. Lake), 1952-1956 | ||||||||||||
Depth | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 0.02 | 0.02 | 0.03 | 0.00 | 0.01 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 |
bottom | 0.02 | 0.01 | 0.03 | 0.00 | 0.00 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.01 |
Station 1 (N. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 0.14 | 0.17 | 0.18 | 0.17 | 0.12 | 0.09 | 0.06 | 0.02 | 0.00 | 0.02 | 0.06 | 0.09 |
5 | 0.14 | 0.17 | 0.18 | 0.16 | 0.12 | 0.09 | 0.06 | 0.02 | 0.01 | 0.03 | 0.06 | 0.09 |
10 | 0.14 | 0.17 | 0.18 | 0.17 | 0.13 | 0.10 | 0.07 | 0.03 | 0.02 | 0.03 | 0.05 | 0.09 |
15 | 0.14 | 0.17 | 0.18 | 0.17 | 0.15 | 0.12 | 0.11 | 0.09 | 0.11 | 0.08 | 0.06 | 0.09 |
20 | 0.14 | 0.17 | 0.18 | 0.17 | 0.16 | 0.16 | 0.16 | 0.15 | 0.17 | 0.17 | 0.06 | 0.09 |
30 | 0.14 | 0.17 | 0.18 | 0.17 | 0.18 | 0.19 | 0.20 | 0.21 | 0.23 | 0.23 | 0.22 | 0.18 |
40 | 0.15 | 0.17 | 0.18 | 0.17 | 0.19 | 0.20 | 0.21 | 0.22 | 0.22 | 0.23 | 0.25 | 0.24 |
60 | 0.22 | 0.18 | 0.18 | 0.18 | 0.19 | 0.20 | 0.21 | 0.22 | 0.22 | 0.23 | 0.25 | 0.26 |
80 | 0.27 | 0.20 | 0.18 | 0.19 | 0.20 | 0.21 | 0.21 | 0.23 | 0.25 | 0.25 | 0.27 | 0.27 |
bottom | 0.27 | 0.20 | 0.18 | 0.19 | 0.20 | 0.21 | 0.23 | 0.25 | 0.27 | 0.27 | 0.28 | 0.30 |
Station 2 (S. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 0.17 | 0.20 | 0.24 | 0.16 | 0.11 | 0.03 | 0.08 | 0.04 | 0.00 | 0.03 | 0.00 | 0.04 |
bottom | 0.17 | 0.20 | 0.24 | 0.16 | 0.11 | 0.03 | 0.08 | 0.04 | 0.00 | 0.03 | 0.00 | 0.04 |
Station 1 (N. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 0.28 | 0.30 | 0.30 | 0.31 | 0.31 | 0.25 | 0.25 | 0.26 | 0.18 | 0.19 | 0.21 | 0.24 |
5 | 0.31 | 0.30 | 0.34 | 0.34 | 0.34 | 0.30 | 0.28 | 0.29 | 0.24 | 0.23 | 0.23 | 0.25 |
10 | 0.29 | 0.31 | 0.31 | 0.34 | 0.31 | 0.31 | 0.28 | 0.27 | 0.22 | 0.22 | 0.22 | 0.25 |
15 | 0.31 | 0.32 | 0.31 | 0.33 | 0.33 | 0.29 | 0.30 | 0.33 | 0.30 | 0.27 | 0.21 | 0.26 |
20 | 0.31 | 0.31 | 0.30 | 0.34 | 0.32 | 0.31 | 0.33 | 0.33 | 0.34 | 0.31 | 0.23 | 0.24 |
30 | 0.33 | 0.32 | 0.30 | 0.35 | 0.31 | 0.31 | 0.32 | 0.37 | 0.36 | 0.34 | 0.33 | 0.32 |
40 | 0.29 | 0.30 | 0.31 | 0.32 | 0.31 | 0.30 | 0.30 | 0.35 | 0.35 | 0.33 | 0.35 | 0.37 |
60 | 0.37 | 0.30 | 0.32 | 0.34 | 0.32 | 0.31 | 0.29 | 0.34 | 0.34 | 0.33 | 0.30 | 0.36 |
80 | 0.39 | 0.33 | 0.30 | 0.33 | 0.32 | 0.31 | 0.30 | 0.35 | 0.37 | 0.35 | 0.37 | 0.39 |
bottom | 0.42 | 0.33 | 0.34 | 0.35 | 0.33 | 0.34 | 0.33 | 0.41 | 0.43 | 0.47 | 0.39 | 0.46 |
Station 2 (S. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 0.37 | 0.36 | 0.45 | 0.37 | 0.37 | 0.29 | 0.30 | 0.25 | 0.31 | 0.34 | 0.25 | 0.26 |
bottom | 0.39 | 0.39 | 0.45 | 0.39 | 0.40 | 0.34 | 0.35 | 0.30 | 0.34 | 0.36 | 0.26 | 0.28 |
Station 1 (N. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | .0002 | .0003 | .0004 | .0002 | .0002 | .0001 | .0001 | .0001 | .0001 | .0001 | .0001 | .0001 |
5 | .0003 | .0005 | .0004 | .0002 | .0001 | .0002 | .0002 | .0001 | .0001 | .0001 | .0001 | .0001 |
10 | .0002 | .0005 | .0004 | .0001 | .0002 | .0002 | .0002 | .0001 | .0001 | .0001 | .0001 | .0001 |
15 | .0003 | .0004 | .0004 | .0001 | .0001 | .0002 | .0001 | .0001 | .0001 | .0001 | .0001 | .0000 |
20 | .0002 | .0004 | .0005 | .0001 | .0001 | .0001 | .0002 | .0001 | .0001 | .0002 | .0001 | .0000 |
30 | .0002 | .0004 | .0004 | .0002 | .0002 | .0002 | .0004 | .0002 | .0002 | .0002 | .0002 | .0001 |
40 | .0002 | .0004 | .0004 | .0002 | .0003 | .0003 | .0005 | .0003 | .0002 | .0003 | .0005 | .0003 |
60 | .0009 | .0004 | .0005 | .0002 | .0004 | .0004 | .0005 | .0008 | .0005 | .0008 | .0011 | .0012 |
80 | .0020 | .0008 | .0005 | .0005 | .0006 | .0007 | .0008 | .0016 | .0015 | .0019 | .0020 | .0020 |
bottom | .0022 | .0009 | .0004 | .0005 | .0008 | .0011 | .0020 | .0026 | .0025 | .0031 | .0026 | .0022 |
Station 2 (S. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | .0002 | .0003 | .0004 | .0002 | .0002 | .0002 | .0007 | .0004 | .0002 | .0002 | .0002 | .0003 |
bottom | .0003 | .0002 | .0004 | .0002 | .0003 | .0002 | .0007 | .0004 | .0002 | .0002 | .0002 | .0004 |
Station 1 (N. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | .006 | .007 | .007 | .005 | .009 | .007 | .008 | .007 | .007 | .007 | .005 | .006 |
5 | .006 | .007 | .008 | .007 | .010 | .009 | .011 | .009 | .009 | .010 | .006 | .008 |
10 | .006 | .006 | .008 | .007 | .011 | .009 | .011 | .009 | .008 | .009 | .006 | .006 |
15 | .006 | .007 | .007 | .009 | .010 | .008 | .009 | .007 | .010 | .008 | .007 | .011 |
20 | .006 | .009 | .008 | .007 | .008 | .007 | .007 | .006 | .006 | .007 | .006 | .014 |
30 | .005 | .007 | .007 | .006 | .006 | .005 | .005 | .004 | .005 | .006 | .004 | .005 |
40 | .005 | .007 | .007 | .007 | .006 | .006 | .004 | .005 | .005 | .005 | .006 | .005 |
60 | .006 | .009 | .008 | .006 | .006 | .004 | .004 | .005 | .005 | .006 | .007 | .007 |
80 | .010 | .008 | .008 | .007 | .007 | .007 | .006 | .010 | .009 | .010 | .011 | .010 |
bottom | .011 | .010 | .007 | .009 | .012 | .009 | .013 | .016 | .014 | .018 | .017 | .024 |
Station 2 (S. Lake), 1982-1986 | ||||||||||||
Depth [m] | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.5 | .012 | .013 | .017 | .013 | .019 | .018 | .018 | .021 | .022 | .023 | .017 | .017 |
bottom | .013 | .013 | .017 | .014 | .018 | .019 | .018 | .022 | .024 | .024 | .018 | .018 |
F2 FAUNA
F4 BIOMASS
Year | 1964 | 1969 | 1974 | 1979 |
---|---|---|---|---|
Egeria densa | - | - | 577 | 94 |
Elodea nuttallii | - | 460 | 21 | + |
Others | 30 | 97 | 22 | 24 |
Total | 30 | 557 | 620 | 118 |
1955 | 1960 | 1965 | 1970 | 1975 | 1980 | |
---|---|---|---|---|---|---|
Fish total | 2181 | 1926 | 2938 | 3105 | 3262 | 3514 |
Oncorhynchus rhodurus | 68 | 30 | 37 | 23 | 22 | 11 |
Plecoglossu altivelis | 608 | 312 | 308 | 678 | 892 | 1345 |
Cyprinus carpio | 57 | 70 | 131 | 154 | 202 | 164 |
Carassius | 613 | 701 | 1104 | 615 | 616 | 791 |
Tribolodon hakonensis | 46 | 29 | 27 | 50 | 64 | 67 |
Zacco platypus | 11 | 13 | 33 | 37 | 40 | 39 |
Anguilla japonica | 30 | 22 | 19 | 37 | 13 | 9 |
Chaenogobius isaza | 10 | 5 | 436 | 473 | 377 | 411 |
Gnathopogon | 230 | 285 | 352 | 476 | 323 | 233 |
Opsariichthys uncirostris | 200 | 87 | 122 | 162 | 100 | 134 |
Others | 308 | 372 | 369 | 400 | 613 | 310 |
Mollusca total | 8205 | 5287 | 2957 | 2836 | 1412 | 950 |
Corbicula | 5697 | 4226 | 2511 | 1725 | 992 | 700 |
Others | 2508 | 1061 | 446 | 1111 | 420 | 250 |
Others | 230 | 269 | 286 | 519 | 1329 | 725 |
Total | 10616 | 7482 | 6181 | 6460 | 6003 | 5189 |
Natural landscape | Area [km2] | [%] |
---|---|---|
Woody vegetation | ||
Natural forests with little human disturbance | ||
Cool-temperate deciduous broadleaf forest (Fagus crenata, Acer spp.) | 59.3 | 1.8 |
Warm-temperate deciduous broadleaf forest (Zeikova serrata, Carpinus spp.) | 18.3 | 0.5 |
Evergreen broadleaf forest (Castanopsis cuspidata, Persea thunbergii, Quercus spp.) | 2.1 | 0.1 |
Evergreen conifer forest (Abies firma) | 11.3 | 0.3 |
Swamp forest (Salix chaenomeloides) | 1.2 | <0.1 |
Secondary forest | ||
Cool-temperate deciduous broadleaf forest (Quercus mongolica var. grosseserrata) | 511.7 | 15.3 |
Warm-temperate deciduous broadleaf forest (Quercus serrata, Q. acutissima) | 144.6 | 4.3 |
Pine forest (Pinus densiflora) | 817.0 | 24.5 |
Scrub | 135.3 | 4.1 |
Others | ||
Evergreen conifer plantation (Cryptomeria japonica, Chamaecyparis obtusa) | 395.0 | 11.8 |
Bamboo forest (Phyllostachys bambusoides) | 13.1 | 0.4 |
Herbaceous vegetation | ||
Dwarf bamboo community (Sasa spp.) | 7.2 | 0.2 |
Grassland (Miscanthus sinensis) and weeds | 54.6 | 1.6 |
Swamp (Phragmites australis) | 7.3 | 0.2 |
Agricultural land | ||
Paddy field | 767.7 | 23.0 |
Upland field | 23.7 | 0.7 |
Mulberry plantation | 4.5 | 0.1 |
Tea plantation | 9.0 | 0.3 |
Orchard | 5.6 | 0.2 |
Others | 20.2 | 0.6 |
Residential and industrial area | ||
Urban | 175.4 | 5.3 |
Rural | 50.5 | 1.5 |
Industrial | 24.1 | 0.7 |
Others | 48.0 | 1.4 |
Open water | 33.3 | 1.0 |
Total (exclusive of L. Biwa) | 3340.0 | 100.0 |
Paddy field | Upland field | Orchrd | Pasture | Total | |
---|---|---|---|---|---|
1975 | 609 | 38.6 | 23.9 | 2.8 | 674 |
1976 | 603 | 38.5 | 22.7 | 3.1 | 667 |
1977 | 597 | 37.9 | 22.5 | 3.3 | 661 |
1978 | 593 | 37.6 | 22.0 | 3.3 | 656 |
1979 | 588 | 36.9 | 21.9 | 3.4 | 650 |
1980 | 583 | 36.7 | 21.7 | 3.3 | 645 |
1981 | 579 | 36.5 | 20.8 | 3.4 | 640 |
1982 | 575 | 36.2 | 20.3 | 3.2 | 635 |
1983 | 571 | 35.8 | 20.1 | 3.2 | 630 |
1984 | 569 | 35.4 | 19.2 | 3.2 | 627 |
Gross produc- tion during the year [106 yen]* |
No. of persons engaged (1980) |
No. of establish- ments |
Main products and main kinds of industry |
|
---|---|---|---|---|
Primary industry | ||||
Agriculture | 104.847 | 58,300 | N.A. | 1) |
Forestry | 7.559 | 1.100 | N.A. | 2) |
Fisheries | 4.836 | 1.500 | N.A. | 3) |
Secondary industry | ||||
Manufacturing | 3,081,699 | 167,000 | 9,249 | 4) |
Mining | N.A. | 500 | 58 | 5) |
Others | N.A. | 40,700 | 7,205 | 6) |
Tertiary industry | N.A. | 250,600 | 41,367 | 7) |
*1 In shiga prefecture.
1955 | 1960 |
1970 | 1980 | |
---|---|---|---|---|
Primary industry | 51.4 | 43.5 | 27.6 | 11.7 |
Agriculture | 49.0 | 42.0 | 11.2 | |
27.3 | ||||
Forestry | 2.0 | 1.1 | 0.2 | |
Fisheries | 0.4 | 0.4 | 0.3 | 0.3 |
Secondary industry | 20.5 | 25.7 | 35.2 | 40.0 |
Manufacturing | 16.3 | 19.9 | 29.2 | 32.1 |
Mining | 0.3 | 0.5 | 0.2 | 0.1 |
Others | 3.9 | 5.3 | 5.8 | 7.8 |
Tertiary industry | 28.0 | 30.8 | 37.3 | 48.3 |
Total | 100.0 | 100.0 | 100.0 | 100.0 |
(Actual number) | (411,243) | (427,018) | (486,220) | (520,211) |
G3 POPULATION IN THE CATCHMENT AREA*1 (1985)(31,37)
Total Population | Population density [km-2] | Major cities (population) |
---|---|---|
1,155,844 | 277.8 | Otsu(234,551), Hikone, |
(345.7)* | Kusatsu, Omi-hachiman |
Fig. ASI-1-14 Trend of population increase in Shiga Prefecture (31-37)
Use rate [m3 sec-1] | |||
---|---|---|---|
In Shiga Pref. | Biwako Canals | Total | |
Domestic | 3.41 | 12.96 | 16.37 |
Irrigation | 30.00 | 1.29 | 31.29 |
Industrial | 3.04 | 0.03 | 3.07 |
Power plant | 61.22 | 43.32 | 104.54 |
Others | 8.70 | 0.48 | 9.182 |
Total | 106.37 | 58.08 | 164.14 |
Power plant (Seta River) | 186.14 | ||
Sum total | 350.50 |
Fig. ASI-1-15 (38) Utilization of water in the Lake Biwa/Yodo River system.
Name of contaminant | Concentration [ppm] | Main Source | |||
---|---|---|---|---|---|
Water | Bottom mud | Fish | Other organisms | ||
Methyl Hg | - | - | 0.013-0.79 | - | Pesticide |
(1969) | |||||
Total Hg | 0.0005 | 0.72-1.75 | 0.020-1.61 | - | Pesticide |
(1981) | (1978) | (1969) | |||
Cd | N.D. | 0.3-5.5 | 0.00-0.146 | 0.20-0.59 | Industrial |
(1978) | (1979) | (1976) | (1970) | ||
Cr | 0.002 | 29.5-74.6 | - | - | Industrial |
(1981) | (1979) | ||||
Pb | 0.05 | 32-134 | 0.00-8.25 | 0.00-25.1 | Industrial |
(1981) | (1979) | (1976) | (1976) | ||
Zn | 0-0.007 | 144-390 | 9.8-88.1 | 5.1-48.3 | Industrial |
(1978) | (1979) | (1976) | (1976) | ||
Sb | 0.002-0.01 | 0.0-0.51 | 0.0-0.82 | 0.0-1.62 | Industrial |
(1980) | (1977) | (1976) | (1976) | ||
Cu | 0.002-0.019 | 0.3-129 | 0.37-15.1 | 0.65-239 | Industrial |
(1980) | (1977) | (1976) | (1976) | ||
Ni | 0.004-0.018 | 0.29-7.19 | 0.0-0.86 | 0.18-1.24 | Industrial |
(1980) | (1977) | (1976) | (1976) | ||
F | 0.08-0.12 | - | - | - | Industrial |
(1975) | |||||
As | 0.02 | 8.1-20.8 | - | - | Industrial |
(1981) | (1978) | ||||
DDT | - | - | 0.04 | 0.029-0.14 | Pesticide |
(1976) | (1963) | ||||
BHC | 0.00004 | - | 0.04 | 0.013-0.075 | Pesticide |
(1979) | (1982) | (1963) | |||
PCP | - | - | 0.0-0.113 | - | Herbicide |
(1969) | |||||
PCB | 0.1 | 0.03-1.15 | 0.2-2 | 0.02-1 | Industrial |
(1975) | (1976) | (1976) | (1976) | ||
CNP | 0.0-0.000015 | 0.007-0.076 | 0.06 | - | Herbicide |
(1984) | (1985) | (1981) |
Methyl Hg | Total Hg | Sb | Pb | Cu | |
---|---|---|---|---|---|
Fish | |||||
1 Plecoglossus altivelis | .031-.051 | .045-.064 | .02-.27 | .49-5.89 | 1.19-2.24 |
2 Cyprinus carpio | - | - | - | .0-.35 | .91-1.01 |
3 Carassius carassius (subsp. cuvieri ?) |
- | - | .0-.05 | .0-1.98 | 1.26-2.53 |
4 Tribolodon hakonensis | .13-.23 | .25-.40 | - | - | - |
5 Parasilurus variegatus (subsp. microculus ?) |
- | - | - | .08-.12 | .63-.73 |
6 Chaenogobius isaza | - | - | - | - | - |
Shellfish | |||||
7 Sinotaia quadrata histrica | - | - | .0-1.11 | .0-8.36 | 26.0-98.3 |
8 Unio douglasiae biwae | - | - | .06 | - | 1.7 |
Submerged macrophyte | |||||
9 Elodea nuttallii | - | - | .0-.07 | .0-1.72 | .65-2.71 |
10 Potamogeton malaianus | - | - | .02-.08 | .10-.71 | 1.38-5.07 |
Cd | Zn | Ni | DDT | PCP | PCB | CNP | |
---|---|---|---|---|---|---|---|
1 | .001-.086 | 20.7-29.2 | .07-.85 | - | - | .3-2 | - |
2 | .0-.006 | 51.3-68.8 | .02-.09 | - | .0-.113 | 1-10 | |
3 | .0-.055 | 40.3-88.1 | .12-.39 | - | .027-.0995 | 1-20 | - |
4 | - | - | - | - | - | - | - |
5 | .009 | 14.9-31.8 | .0-.01 | - | - | - | - |
6 | - | - | - | .04 | .018 | .03-.8 | tr-.011 |
7 | .0-.10 | 25.3-126 | .0-1.98 | - | - | - | - |
8 | .17 | 35.4 | .01 | - | - | - | - |
9 | .0-.06 | 6.3-30.4 | .20-.75 | - | - | - | - |
10 | .03-.06 | .2-48.3 | .33-1.24 | - | - | - | - |
Maximum permissible limits [ppm] | |||
---|---|---|---|
Water Pollution Control Law* |
More stringent prefectural standards |
Environmental Pollution Control Ordinance(Shiga)* | |
Cd and its compounds | .1 | .01 | .01 |
Cyanides | 1 | .1 | .1 |
Organic P | 1 | N.D. | N.D. |
Pb and its compounds | 1 | .1 | .1 |
6+compounds | .5 | .05 | .05 |
As and its compounds | .5 | .05 | .05 |
Total Hg | .005 | - | .005 |
Alkyl Hg compounds | N.D. | - | N.D. |
PCB | .003 | - | .003 |
B. Items related to the protection of the environment
Maximum permissible limits [ppm] | |||||
---|---|---|---|---|---|
Water Pollution Control Law* |
More stringent prefectural standards |
Environmental Pollution Control Ordinance(Shiga)* | |||
Water discharge rate [m3 day-1] |
>50 | 30-50 | >50 | 30-50 | >50 |
pH | 5.8-8.6 | 6.0-8.5 | 6.0-8.5 | ||
100 | 80 | 100 | 80 | ||
BOD*2 | 160 | 120 | 90 | 120 | 90 |
70 | 50 | 70 | 50 | ||
100 | 80 | 100 | 80 | ||
COD*2 | 160 | 120 | 90 | 120 | 90 |
70 | 50 | 70 | 50 | ||
SS | 200 | 90 | 70 | 90 | 70 |
Mineral oil | 5 | 5 | 5 | ||
Animal and vegetable fat | 30 | 20 | 20 | ||
Phenols | 5 | 1 | 1 | ||
Cu | 3 | 1 | 1 | ||
Zn | 5 | 1 | 1 | ||
Dissolved Fe | 10 | 10 | 10 | ||
Dissolved Mn | 10 | 10 | 10 | ||
Cr | 2 | .1 | .1 | ||
F | 15 | 8 | 8 | ||
B | - | - | 2 | ||
Sb | - | - | .05 | ||
No. of coliform group [cells ml-1] |
3,000 | 3,000 | 3,000 |
*Japanese National Government enacted the Water Pollution Control Law (Statute No.138) in 1971. It was allowed for local governments to set more stringent standards where necessary. The Prefectural Government of Shiga revised the Prefectural Environmental Pollution Control Ordinance (legislated in 1969) completely in 1973 to meet the growing threat to human health and water quality due to the pollution of Lake Biwa.
T-N | |||||
Sources | Industrial | Domestic | Agricultural | Natural | Total |
---|---|---|---|---|---|
1960 | 405.5 | 1,021.3 | 2,047.7 | 1,986.9 | 5,461.4 |
1965 | 677.7 | 1,313.7 | 1,783.9 | 2,014.5 | 5,789.8 |
1970 | 1,281.4 | 1,821.3 | 1,804.0 | 2,033.9 | 6,940.6 |
1975 | 1,407.2 | 2,585.9 | 1,733.4 | 2,104.3 | 7,830.8 |
1980 | 2,089.2 | 3,248.0 | 1,726.9 | 2,131.9 | 9,196.0 |
T-P | |||||
Sources | Industrial | Domestic | Agricultural | Natural | Total |
---|---|---|---|---|---|
1960 | 110.3 | 88.4 | 98.4 | 70.4 | 367.5 |
1965 | 119.0 | 200.4 | 101.0 | 71.4 | 491.8 |
1970 | 372.0 | 348.7 | 119.6 | 72.2 | 912.5 |
1975 | 249.0 | 407.6 | 118.6 | 74.8 | 850.0 |
1980 | 371.1 | 497.4 | 120.7 | 75.8 | 1,065.0 |
N [%] | P [%] | |
---|---|---|
Natural | 27 | 9 |
Domestic wastewater | 33 | 48 |
Industrial wastewater | 18 | 29 |
Agricultural runoff | 22 | 14 |
Total | 100 | 100 |
J3 SANITARY FACILITIES AND SEWERAGE