E. LAKE WATER QUALITY


SITE  : Lake Center
YEAR  : 2015
SOURCE: Okayama Prefectural Government FY Heisei27 Water Quality Measurement Report


         Unit     Ave.   Min.   Max.
---------------------------------------
E2 pH             8.4    7.4    9.5
E3 SS  [mg l-1]   17      8     32
E4 DO  [mg l-1]   10     5.0    17
E5 COD [mg l-1]   6.9    5.3    9.3
E7 T-N [mg l-1]   1.1   0.83    1.4
E8 T-P [mg l-1]   0.17  0.086   0.31






SOURCE: Data Book of World Lake Environments


E1 TRANSPARENCY [m](Q)

SITE: Lake centre
YEAR: 1985

Month   	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
-----------------------------------------------------------------------------------------------------------------
Depth [m]
                0.5	0.6	0.5	0.5	0.4	0.5	0.4	0.4	0.5	0.5	0.4	0.5


E2 pH (Q)
Month   	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
-----------------------------------------------------------------------------------------------------------------
Depth [m]
  0.5	        9.2	8.7	9.3	9.2	9.4	8.8	7.5	8.4	7.4	8.5	9.2	9.4


E3 SS [mg l-1](Q)
Month   	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
-----------------------------------------------------------------------------------------------------------------
Depth [m]
  0.5	        28	12	19	20	25	19	27	16	20	17	26	21


E4 DO [mg l-1](Q)
Month   	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
-----------------------------------------------------------------------------------------------------------------
Depth [m]
  0.5	        14	12	17	15	10	9.1	9.5	8.2	5.8	9.9	13	14


E5 COD [mg l-1](Q)
Determined by KMnO4 method.

Month   	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
-----------------------------------------------------------------------------------------------------------------
Depth [m]
  0.5	        10	9.8	13	10	11	10	9.1	11	8.1	9.0	10	10


E6 CHLOROPHYLL CONCENTRATION [micro l-1](Q)
Month   	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
-----------------------------------------------------------------------------------------------------------------
Depth [m]
  0.5	        110	96	180	120	130	100	56	74	28	62	160	150


E7 NITROGEN CONCENTRATION (Q)
Total-N [mg l-1]
Month   	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
-----------------------------------------------------------------------------------------------------------------
Depth [m]
  0.5	        2.02	2.24	3.19	1.98	1.32	1.71	1.83	1.52	1.55	1.46	1.81	1.83


E8 PHOSPHORUS CONCENTRATION (Q)
Total-P [mg l-1]

Month   	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
-----------------------------------------------------------------------------------------------------------------
Depth [m]
  0.5	       0.16	0.19	0.18	0.13	0.24	0.16	0.33	0.34	0.21	0.13	0.16	0.15