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 2009 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 2009). 

 

 

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 2009 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

2009

 

 

DO

(mg/l)

 

BOD

(mg/l)

DO

(mg/l)

BOD

(mg/l)

1.

Rishikesh

8.1

1.7

8.0

1.0

2.

Hardwar D/s

8.1

1.8

7.8

1.3

3.

Garhmukteshwar

7.8

2.2

7.9

2.0

4.

Kannauj U/S

7.2

5.5

7.2

1.5

5.

Kannauj D/S

NA

NA

7.6

4.8

6.

Kanpur U/S

7.2

7.2

7.5

3.8

7.

Kanpur D/S

6.7

8.6

7.5

3.9

8.

Allahabad U/S

6.4

11.4

8.13

6.25

9.

Allahabad D/S

6.6

15.5

8.13

4.00

10.

Varanasi U/S

5.6

10.1

7.83

3.83

11.

Varanasi D/S

5.9

10.6

7.72

3.10

12.

Patna U/S

8.4

2.0

7.03

1.60

13.

Patna D/S

8.1

2.2

6.88

2.17

14.

Rajmahal

7.8

1.8

6.53

1.65

15.

Palta

N/A

N/A

7.23

2.77

16.

Uleberia

N/A

N/A

5.45

2.47

 

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

                                                      BOD equal to or less than 3.0 mg/l