E. LAKE WATER QUALITY
SITE : Lake Center
YEAR : 2015
SOURCE: Nagano Prefectural Government FY:Heisei27 Water Quality Measurement Report
E1 TRANSPARENCY [m]
Month Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar
---------------------------------------------------------------------------------------------------------------
3.9 5 7 4 7 4.2 6 3.5
E2 pH
Month Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 6.5 7.7 7.6 7.7 7.8 8.8 8.5 7.8
25 6,5 7.3 6.3 6.5 7.1 6.9 7.0 6.3
E3 SS [mh l-1]
Month Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 1 1 <1 7 <1 1 <1 4
25 1 1 8 <1 1 <1 <1 <1
E4 DO [mg l-1]
Month Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 11 10 9.1 10 8.5 9.5 9.8 9.8
25 9.7 5.6 2.0 3.0 0.5 0.6 0.5 <0.5
E5 COD [mg l-1]
Month Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 0.8 1.5 1.5 4.0 1.4 2.0 1.6 3.4
25 0.7 1.3 2.5 1.5 3.1 3.6 4.0 4.9
E7 NITROGEN CONCENTRATION
Total-N [mg l-1]
Month Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 0.24 0.16 0.16 0.23 0.08 0.15 0.06 0.21
25 0.28 0.39 0.70 0.41 0.63 0.74 0.79 0.77
E8 PHOSPHORUS CONCENTRATION (5)
Total-P [mg l-1]
Month Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 0.007 0.005 <0.003 0.028 0.004 0.006 0.004 0.013
25 0.008 0.008 0.025 0.022 0.025 0.037 0.033 0.073
SOURCE: Data Book of World Lake Environments
E1 TRANSPARENCY [m](5)
SITE: Station 1
YEAR: 1985
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
---------------------------------------------------------------------------------------------------------------
Depth [m]
- - - 2.5 4.0 3.5 3.5 6.5 7.5 7.5 10 5.0
E2 pH (5)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 - - - 7.4 7.3 9.2 7.2 7.5 7.4 7.7 7.8 6.8
29 - - - 6.6 6.6 6.5 6.4 7.6 6.4 6.5 7.8 6.8
E3 SS [mg l-1](5)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 - - - <1 2 2 2 1 3 2 2 1
29 - - - <1 2 <1 4 4 4 3 4 2
E4 DO [mg l-1](5)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 - - - 11 10 9.9 9.6 8.5 8.6 9.4 9.5 8.9
29 - - - 8.5 8.6 6.1 3.1 0.8 0.9 1.0 0.2 6.2
E5 COD [mg l-1](5)
Determined by KMnO4 method.
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 - - - 2.3 2.1 3.0 1.2 1.6 1.3 <0.5 1.0 0.9
29 - - - 1.5 1.1 1.8 1.3 0.8 1.1 1.6 2.3 1.0
E6 CHLOROPHYLL CONCENTRATION [micro l-1](Q)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
---------------------------------------------------------------------------------------------------------------
Depth [m]
0 - - - - 0.5 - 0.5 2.1 6.4 7.8 0.4 2.1
2 - - - - 1.0 - 1.8 1.7 6.0 14.6 1.0 2.0
5 - - - - 0.9 - 4.4 0.9 1.8 1.3 1.2 2.2
10 - - - - 0.5 - 2.7 0.9 0.5 0.6 0.7 2.1
20 - - - - 0.5 - 1.0 0.3 0.4 1.1 0.5 1.0
E7 NITROGEN CONCENTRATION (5)
Total-N [mg l-1]
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 - - - 0.47 0.49 0.36 0.27 <0.29 0.19 0.14 0.15 0.44
29 - - - 0.71 0.72 0.90 0.88 0.58 0.56 0.44 1.2 0.47
E8 PHOSPHORUS CONCENTRATION (5)
Total-P [mg l-1]
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
---------------------------------------------------------------------------------------------------------------
Depth [m]
0.5 - - - .012 .015 .007 .005 .035 .006 .005 .004 .008
29 - - - .009 .009 .015 .011 .005 .010 <.003 .057 .008
