Ganga

 

Ø  The river water quality has shown improvement over the pre-GAP period water quality as may be seen at Table 7 & 8. It will be observed that in 1986, the bio-chemical oxygen demand (BOD) which is an indicator of pollution of river water quality was ranging from 5.5 to 15.5 mg/l in the critical stretch of Ganga from Kannauj to Varanasi.  As against this, the values of BOD in 2010 in the stretch of Kannauj to Kanpur is (1.5 – 4.8 mg/l) and Allahabad to Varanasi (3.10 – 6.25 mg/l) respectively. This is based on average of four months (March to June 2010). 

 

 

Ø  Similarly, Dissolved Oxygen (DO) levels which indicate the health of the river, were in the range of 5.6 to 6.6 mg/l in 1986 in the Allahabad-Varanasi stretch and in 2010 the range improved from 7.72 to 8.13 mg/l.

 

 

WATER QUALITY DATA FOR RIVER GANGA

(Summer Average i.e. March-June)

 

S.No

Station/Location

1986

2010

 

 

DO

(mg/l)

 

BOD

(mg/l)

DO

(mg/l)

BOD

(mg/l)

1.

Rishikesh

8.1

1.7

7.48

1.48

2.

Hardwar D/s

8.1

1.8

7.38

1.90

3.

Garhmukteshwar

7.8

2.2

7.43

2.18

4.

Kannauj U/S

7.2

5.5

7.32

4.18

5.

Kannauj D/S

NA

NA

7.03

4.58

6.

Kanpur U/S

7.2

7.2

6.35

3.34

7.

Kanpur D/S

6.7

8.6

6.18

4.16

8.

Allahabad U/S

6.4

11.4

7.67

5.51

9.

Allahabad D/S

6.6

15.5

7.98

4.41

10.

Varanasi U/S

5.6

10.1

8.46

2.26

11.

Varanasi D/S

5.9

10.6

7.85

3.78

12.

Patna U/S

8.4

2.0

6.13

1.79

13.

Patna D/S

8.1

2.2

6.10

2.20

14.

Rajmahal

7.8

1.8

6.35

1.63

15.

Palta

N/A

N/A

7.61

2.53

16.

Uleberia

N/A

N/A

6.51

2.69

(Sources :CPCB Delhi)

 

 

Bathing Water Quality Criteria:          DO equal to or more than 5.0 mg/l

                                                BOD equal to or less than 3.0 mg/l