S/N

Causal Factors

1

2

3

4

5

6

7

8

9

Score

Rank

1

Incidence of pollution

59

20

6

10

10

-

-

-

-

207

1

2

Gas flaring

31

40

6

18

10

-

-

-

-

251

2

3

Industrial pollution

10

21

20

31

23

-

-

-

-

351

3

4

Thermal pollution

5

9

32

36

20

3

-

-

-

368

4

5

Erosion

-

15

20

10

30

30

-

-

-

460

5

6

Siltation

-

-

11

-

20

40

33

1

-

612

6

7

Physical obstruction of water ways by waste and equipment

-

-

-

-

2

32

41

20

10

739

7

8

Sewage pollution

-

-

-

-

-

-

21

50

34

847

8

9

Flooding

-

-

-

-

-

-

10

34

61

891

9