|
WATER ANALYSES
FOR RIVER GREAT STOUR
January
1998 - December 1998 2
SEASONAL
CHANGES
Vauxhall Bridge
(GR 163598)
|
Parameter
|
Units
|
Jan
|
Feb
|
Mar
|
Apr
|
May
|
Jun
|
Jul
|
Aug
|
Sept
|
Oct
|
Nov
|
Dec
|
|
Discharge
|
Cumecs
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Temp
|
oC
|
7.4
|
4.9
|
10.1
|
11.6
|
17.1
|
12.9
|
16.1
|
20.0
|
17.9
|
12.5
|
11.2
|
6.6
|
|
pH
|
pH
units
|
8.1
|
8.1
|
8.1
|
8.1
|
8.3
|
8.1
|
8.0
|
8.2
|
7.9
|
8.1
|
n/a
|
7.9
|
|
dissolved
O2
|
%
|
94
|
93
|
96
|
115
|
120
|
94
|
86
|
110
|
97
|
102
|
97
|
97
|
|
BOD
|
mg/l
|
1.8
|
1.6
|
1.5
|
1.5
|
1.5
|
1.7
|
1.3
|
1.2
|
1.8
|
2.0
|
n/a
|
1.6
|
|
Ammonia
|
mg/l
|
0.10
|
0.15
|
0.04
|
<0.03
|
<0.03
|
<0.03
|
<0.03
|
0.05
|
0.04
|
0.06
|
n/a
|
0.15
|
|
Nitrate
|
mg/l
|
6.7
|
7.4
|
6.2
|
5.3
|
5.4
|
5.2
|
3.6
|
4.2
|
3.6
|
5.3
|
n/a
|
6.8
|
|
Nitrite
|
mg/l
|
0.05
|
0.06
|
0.04
|
0.03
|
0.03
|
0.09
|
0.02
|
0.03
|
0.06
|
0.09
|
n/a
|
0.06
|
|
Phosphate
|
mg/l
|
0.30
|
0.53
|
0.46
|
0.19
|
0.24
|
0.77
|
0.86
|
0.56
|
0.52
|
0.42
|
n/a
|
0.18
|
Blackmill Bridge
(GR 174599)
|
Parameter
|
Units
|
Jan
|
Feb
|
Mar
|
Apr
|
May
|
Jun
|
Jul
|
Aug
|
Sept
|
Oct
|
Nov
|
Dec
|
|
Discharge
|
Cumecs
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Temp
|
oC
|
7.5
|
5.6
|
10.7
|
12.1
|
17.5
|
13.4
|
16.2
|
20.5
|
18.0
|
12.7
|
11.6
|
7.0
|
|
pH
|
pH
units
|
8.0
|
8.0
|
8.0
|
8.0
|
8.2
|
8.0
|
7.9
|
8.1
|
8.0
|
7.9
|
n/a
|
7.9
|
|
dissolved
O2
|
%
|
103
|
89
|
95
|
117
|
125
|
100
|
88
|
122
|
92
|
97
|
94
|
96
|
|
BOD
|
mg/l
|
5.5
|
2.2
|
1.8
|
1.7
|
2.0
|
1.6
|
1.8
|
1.5
|
1.6
|
2.6
|
n/a
|
2.1
|
|
Ammonia
|
mg/l
|
0.28
|
0.95
|
0.84
|
0.08
|
0.10
|
0.04
|
<0.03
|
0.05
|
0.07
|
0.40
|
n/a
|
0.14
|
|
Nitrate
|
mg/l
|
6.7
|
6.6
|
7.4
|
8.3
|
10.6
|
9.8
|
7.6
|
10.2
|
10.4
|
9.7
|
n/a
|
11.2
|
|
Nitrite
|
mg/l
|
0.54
|
0.80
|
0.36
|
0.12
|
0.11
|
0.09
|
0.02
|
0.03
|
0.06
|
0.18
|
n/a
|
0.11
|
|
Phosphate
|
mg/l
|
0.41
|
0.68
|
0.54
|
0.34
|
0.56
|
0.91
|
0.93
|
1.54
|
1.01
|
0.71
|
n/a
|
0.56
|
Source: The Environment Agency |
