Environmental Assessment of Proposed Sylhet Hi-Tech Park



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7.3.2.1.2. Surface Water Quality


170. Adjacent to the proposed project site there is a narrow river, some small sizes shallow ditches at the north side and a beel called Khalitajuri beel at the east side. There is no remarkable source of water pollution in and around the project site. A surface water sample collected from adjacent Khalitajuri Beel and Katakhal River on 23rd December 2014 and analysed in DoE laboratory, Sylhet. Physically we found that the river water is turbid and brown in colour and beel water is clear but many weeds grew there. The Detailed of surface water quality test results of parameter like pH, EC, DO, TS, TDS, SS, BOD, COD, Fe, NH3 and CL2 are shown in Table 09 and 10.



Table 09: Surface water quality of Khalitajuri beel (Source: DoE lab, Sylhet)

Table09: Surface water quality of Khalitajuri Beel at the project site




SN

Parameter

Unit

Concentration

of Surface Water

Bangladesh (DoE) Standard for Surface Water

01

pH




7.9

6.5 – 8.5

02

DO

mg/l

5.4

4.5 – 8.0

03

BOD5

mg/l

39

50

04

COD

mg/l

31

200

05

TDS

mg/l

15.7

2100

06

EC

µS/cm

31.4

1200

07

TS

mg/l

21.98

2250

08

SS

mg/l

6.28

10

09

Fe

mg/l

2.04

2.0

10

NH3

mg/l

0.16

5.0

11

CL2

mg/l

10

600




Table10: Surface water quality of Katakhal River (Source: DoE lab, Sylhet)

Table10: Surface water quality of Katakhal River at the project site


SN

Parameter

Unit

Concentration

of Surface Water

Bangladesh (DoE) Standard for Surface Water

01

pH




7.3

6.5 – 8.5

02

DO

mg/l

5.2

4.5 – 8.0

03

BOD5

mg/l

46

50

04

COD

mg/l

78

200

05

TDS

mg/l

49.5

1000

06

EC

µS/cm

98.3

1200

07

TS

mg/l

68.81

2250

08

SS

mg/l

19.31

10

09

Fe

mg/l

1.68

2.0

10

NH3

mg/l

0.15

5.0

11

CL2

mg/l

12

600


Photograph12: DoE sample collector taking surface water sample from Khalitajuri beel

Photograph13: DoE sample collector taking surface water sample


171. From the above reading the different parameter of surface water of the site is within Bangladesh standard except Fe in the Khalitajuri Beel and Suspended Solids (SS) in the Katakhal River. Fe content in the Khalitajuri Beel is little higher than Bangladesh standard, whereas, SS in Katakhal river is higher than Bangladesh standard. As the sample was taken in the month of late December there was not enough water in the river. Having very less amount of water still there was plying many barges carrying stones from Katakhal Bridge to other places of the country. Because of frequent moving of barges on the shallow river, it makes the water turbid and disturbed. Hence, it is quite natural to increase the SS of the river. But the SS may come down during

monsoon time when water will be enough in the river. This could be cross checked taking another sample from the same spot during rainy season.




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