International Journal of Marine Science, 2017, Vol.7, No.16, 141-160
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Table 4 Typical analysis of river water and pollution load in the Karnafully River at different locations, April 1984- March 1985
Location
pH
E.C.
(micromhos
/cm)
Chloride
(mg/L)
Total
alkalinity
(mg/L)
S.S.
(mg/L)
D.O.
(mg/L)
BOD
(mg/L)
COD
(mg/L)
Remarks
Middle of Karnafully River
near Bambooghat
7.7
245
18.0
55
240
6.5
38
65
Maximum
6.8
134
6.2
34
59
5
4.2
49
Average
6.0
100
2.0
16
101.0
4.0
0.4
30
Minimum
Side of Karnafully
8.5
750
100.0
460
42.5
5.9
22.0
68
Maximum
7.3
218
15.5
36.8
11.0
4.4
3.8
45.1 Average
7.0
120
3.1
18
46
0.1
1.0
30
Minimum
River near Dovashi bazaar 7.6
250
28
60
31
5.6
3.2
55
Maximum
7.2
150
7.4
36
12
5.0
2.0
42.2 Average
6.7
120
2.5
18
58
3.8
0.7
26
Minimum
Middle of Karnafully
River near Dobshi bazaar
8.4
-
-
-
48.5
7.4
2.9
104
Maximum
7.9
-
-
-
23.0
7.0
2.2
78.9 Average
7.6
-
-
-
≦
50
6.5
1.6
39.5 Minimum
Side of Karnafully river
near Patenga
7.7
245
18.0
55
240
6.5
38
65
Maximum
6.8
134
6.2
34
59
5
4.2
49
Average
6.0
100
2.0
16
101.0
4.0
0.4
30
Minimum
Acceptable value of the
parameters in the case of
use of the river for fishing
6.5-8.5 -
-
-
≧
7.0
≦
5
Note: Source: Hossain (2004)
Table 5 Seasonal variation of the Karnafully river water quality
Parameters
Seasons
Karnafullly
Min.
Max.
pH
Pre-monsoon
7.15
8.12
Monsoon
6.36
9.86
Post-monsoon
7.20
8.40
EC
Pre-monsoon
90.00
36325.00
Monsoon
99.00
25300.00
Post-monsoon
93.00
45600.00
DO
Pre-monsoon
.00
6.33
Monsoon
2.15
6.50
Post-monsoon
3.25
7.91
Carbon dioxide
Pre-monsoon
1.41
13.31
Monsoon
4.47
13.40
Post-monsoon
3.12
49.98
Total alkalinity
Pre-monsoon
5.64
119.00
Monsoon
16.29
104.00
Post-monsoon
24.00
121.00
Total hardness
Pre-monsoon
16.00
4000.00
Monsoon
10.00
2380.00
Post-monsoon
22.00
4500.00
Chloride
Pre-monsoon
2.09
13147.70
Monsoon
3.21
10125.94
Post-monsoon
7.00
12120.20
