E5 COD (Chemical Oxygen Demand) [mg L-1](7)
Determined by KMnO4 method.
YEAR: 2010
SITE1: Off Imazu (North Lake)
Depth Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
0.5 2.2 2.3 2.3 2.2 2.8 2.6 2.6 2.9 2.9 2.8 2.7 2.5
5 2.0 2.2 2.4 2.4 2.9 2.7 3.0 2.9 3.2 3.2 2.7 2.6
10 2.3 2.4 2.4 2.5 2.6 2.7 3.2 3.1 2.9 2.9 2.6 2.6
20 2.1 2.3 2.3 2.3 2.3 2.3 2.2 2.5 2.6 2.5 2.5 2.4
40 2.2 2.4 2.3 2.2 2.1 2.3 2.0 2.2 2.1 2.2 2.0 2.1
80 2.1 2.3 2.1 2.1 2.1 2.3 2.0 2.2 2.1 2.1 2.0 2.0
bottom 2.1 2.1 2.1 2.1 2.1 2.3 2.0 2.2 2.1 2.1 2.0 2.0
SITE2: Off Karasaki (South Lake)
Depth Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
0.5 3.2 2.9 2.9 3.4 3.7 3.3 3.1 3.0 4.2 3.1 3.1 3.4
SOURCE: H23 Environmental White Paper, Shiga Prefectural Government
YEAR: 1982 - 1986
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 1.9
5 1.9 1.6 1.7 1.6 1.8 2.2 2.7 2.6 2.4 2.6 2 2
10 1.8 1.7 1.5 1.6 1.6 2.1 2.5 2.3 2.4 2.3 2 2
15 1.8 1.6 1.6 1.5 1.6 1.9 2 2 2.1 2.1 2 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 2.1 2.1 2.8 3.2 2.6 2.9 3.3 3.4 2.9 2.5
