Water quality

Parameters

urban

sub-catchment

agriculture

sub-catchment

less-developed

sub-catchment

Grade

IV

Exceeding rate (sub-catchment)

Mean

S.D.

Mean

S.D.

Mean

S.D.

urban

agriculture

less-developed

DO (mg/l)

2.934

1.85

2.9

1.62

2.8

1.84

3

59%

59%

65%

COD (mg/l)

24.11

7.58

20.94

6.12

22.5

21.79

30

13%

6.6%

9.8%

BOD (mg/l)

4.81

1.57

4.35

1.68

4.29

2.02

6

18%

7.7%

13%

NH₃-N (mg/l)

1.89

1.25

2.03

1.69

2.32

1.99

1.5

58%

59%

63%

TP (mg/l)

0.48

0.26

0.46

0.28

0.51

0.37

0.3

77%

58%

74%

TN (mg/l)

4.25

1.32

4.8

2.29

5.1

2.1

1.5

100%

100%

100%