• Uncategorized

Water Monitoring

In order to assess the water quality in the state, the Nagaland Pollution Control Board in collaboration with the Central Pollution Control Board under the National Water Quality Monitoring Programme (NWMP) monitors 28 (twenty eight) stations in Nagaland. Four major rivers namely Dhansiri & Chathe at Dimapur, Dzu at Kohima and Milak  at Mokokchung are monitored on monthly basis. Ground water source  from 10 stations  is monitored on half yearly basis.

 NATIONAL WATER QUALITY MONITORING PROGRAMME (NWMP) STATIONS IN NAGALAND

Station Code District Type Latitude Longitude Location Monitoring   frequency
1796 Dimapur R 25˚53.21′ 93˚44.15′ FULL NAGARJAN, DIMAPUR M
1797 Dimapur R 25˚54.77′ 93˚44.58′ BRIDGE NEAR PURANA BAZAAR, DIMAPUR M
1798 Dimapur R 25˚55.66′ 93˚44.832′ NEAR CHECK GATE (DIMAPUR-KHATKHATI ROAD) M
1799 Dimapur R 25˚54.22′ 93˚40.90′ TOWN BOUNDARY BRIDGE(DIPHU ROAD) DIMAPUR M
1800 Dimapur R 25˚55.28′ 93˚43.49′ NUTON BOSTI, (NAGA CEMETERY) NAGALAND M
1928 Dimapur R 25˚557.11′ 93˚45.46′ NAGALAND- ASSAM BORDER, DIMAPUR, NAGALAND M
1929 Dimapur R 25˚46.13′ 93˚49.00′ CHATHE AT MEDZIPHEMA, DIMAPUR, NAGALAND M
1930 Kohima R 25˚39’24.11″ 93˚11’13.2″ DZU IN KOHIMA, NAGALAND M
2886 Dimapur L 25˚53.818′ 93˚45.253′ PUDUMPUKHURI, NEAR NH-29, DIMAPUR M
2887 Dimapur L 25˚54.469′ 93˚45.279′ BANGLA FISHERY, DIMAPUR M
2888 Dimapur R 25˚51.897′ 93˚46.917′ CATHE RIVER NEAR CIHSR, DIMAPUR M
2889 Kohima R 25˚41.052′ 93˚02.424′ DZUDZA RU (HYDRO) IN KOHIMA, NAGALAND M
2890 Kohima R 25˚42.53′ 94˚06.09′ SANO RU (BELOW NEW SECRETARIAT)IN KOHIMA M
2891 Kohima R 25˚39.493′ 94˚07.814′ DZUCHA RU IN KOHIMA, NAGALAND M
2892 Kohima R 25˚39.494′ 94˚07.798′ DZUNA RU IN KOHIMA, ADJOINING  NEW KMC, SWM SITE M
2893 Kohima R 25˚39.517′ 94˚07.806′ DZUCHA RU (CONFLUENCE OF DZUCHA & DZUNA M
2894 Mokokchung R 26˚39’45.6″ 94˚39’45.6″ MILAK RIVER AT TULI, MOKOKCHUNG, NAGALAND M
2895 Mokokchung R 26˚43’15.0″ 94˚37’12.4″ MILAK RIVER AT PAPER NAGAR, TULI, MOKOKCHUNG M
2896 Kohima W 25˚40.64′ 94˚06.91′ BOREWELL AT KOHIMA VILLAGE IN KOHIMA, NAGALAND H
2897 Peren W 25˚4’09.7″ 93˚32’43.6″ BOREWELL AT KAMDI BAZAR, PEREN, NAGALAND H
2898 Dimapur W 25˚45’41” 93˚36’01.6″ OPENWELL AT DOYAPUR DHANSIRIPAR, DIMAPUR H
2899 Dimapur W 25˚47’11.5″ 93˚37’35.9″ BOREWELL AT DHANSIRIPAR, DIMAPUR H
2900 Dimapur W 25˚52’10.8″ 93˚44’06.1″ OPENWELL AT TOULAZOUMA VILLAGE, DIMAPUR H
2901 Dimapur W 25˚52’57.7″ 93˚44’36.7″ OPEN WELL AT LUNGWIRAM VILLAGE, DIMAPUR H
2902 Dimapur W 25˚52’00.6″ 93˚42’55.6″ BOREWELL AT THAHEKHU VILLAGE, DIMAPUR H
2903 Dimapur W 25˚53’32.8″ 93˚42’37.6″ OPEN WELL AT SIGNAL ANGAMI VILLAGE, DIMAPUR H
2904 Dimapur W 25˚55’11.5″ 93˚43’29.9″ OPEN WELL AT NAGA CEMETRY, DIMAPUR H
2905 Dimapur W 25˚53.757′ 93˚43.203′ BOREWELL AT SIGNAL POINT, DIMAPUR, NAGALAND H

Note: R – River         L – Lake          W – (RING WEll & BORE WELL)         M – Monthly               H – Half yearly

Water analysis report showing average value of different parameters during 2017 is given below:

 

Sl. No

PARAMETERS STATION CODE
1796 1797 1798 1799 1800 1928 1929 1930 2886 2887 2888 2889 2890

2891

1

Dissolved Oxygen (mg/l)

4.77

4.62 4.44 4.58 1.8 4.465 5.37 5.24 4.46 4.69 5.67 5.69 5.12 5.37
2 pH 7.8 7.75 7.7 7.60 7.39 7.66 7.82 8.10 7.42 7.40 7.67 7.84 7.77

7.82

3

Conductivity (µS/cm)

178.4

150.5 150.4 125.8 196.1 156.9 88.25 264.8 149.6 150.1 98.27 117.2 349.2

197.3

4

BOD (mg/l)

3.39

3.66 3.75 2.52 13.89 5.15 2.62 2.7 3.95 3.42 2.54 1.84 2.63

2.55

5

Nitrate- Nitrogen (mg/l)

0.55

0.48 0.45 0.56 0.58 0.50 0.49 0.66 0.45 0.38 0.49 0.67 2.07

0.69

6

Turbidity (NTU)

122.5

170.6 136.1 100.8 56.20 155.6 107.0 158.6 58.25 26.86 115.2 215.1 129.3

78.77

7

Phenolphthalein Alkalinity (mg/l)

1.16

0.66 0.5 0 0 0.33 0.16 4.33 0 0 0 0.72 3.6

0.9

8

Total Alkalinity (mg/l)

84.4

75.33 74.5 69 85.33 75.75 42 99.66 66.88 52.88 40.66 55.11 86.66

63.66

9

Chloride (mg/l)

10.81

7.5 5.6 5.4 15.9 7.1 2.9 7.0 20.6 14.63 2.98 5.93 65

20.45

10

Chemical Oxygen Demand (mg/l)

27.54

22.9 16.3 21.36 28.14 19.78 11.88 12.58 35.74 34.32 15.1 21.44 14.3

13.68

11

Ammonia Nitrogen (mg/l)

0.40

0.24 0.34 0.24 2.4 0.78 0.18 0.28 0.28 0.20 0.20 0.30 0.65

0.53

12

Total Hardness (mg/l)

67.83

63 66.5 53.33 63.33 67.5 40.66 128.1 56.88 46.22 36.44 55.11 127.1

70.88

13

Calcium Hardness (mg/l)

40.5

36.66 38.66 33.33 42.83 34.5 18.16 56.5 27.55 26.66 20.22 32 61.77

34.66

14

Magnesium Hardness (mg/l)

6.48

6.38 6.62 4.75 4.83 8.05 5.46 18.27 7.15 5.69 4.71 6.04 17.61

9.71

15

Sulphate (mg/l)

20.5

23.5 22.66 18.5 18.5 23.08 21.58 58.08 18.55 23 26.77 28 44.66

36.66

16

Total Dissolved Solids (mg/l)

112

88 81 70.88 104.8 90.41 50.86 157.4 77.56 74.91 49.31 58.83 174.4

94.97

17

Total Suspended Solids(mg/l)

0.33

0.26 0.226 0.14 0.16 0.26 0.11 0.32 0.15 0.16 0.16 0.20 0.93 0.27

18

Phosphate (mg/l)

0.26

0.18 0.18 0.37 0.46 0.17 0.10 0.21 0.11 0.06 0.13 0.55 0.88

0.3

19

Boron (mg/l)

0.22

0.07 0.07 0.12 0.33 0.17 0.07 0.06 0.06 0.43 0.18 0.10 0.04

0.10

20

Potassium (mg/l)

10.16

3.81 3.86 3.83 6.16 4.01 3.05 3.86 5.36 7.61 4.45 4.2 9.15

4.58

21

Fluoride (mg/l)

0.18

0.11 0.12 0.14 0.11 0.12 0.09 0.06 0.13 0.22 0.07 0.09 0.09

0.08

22

Arsenic (mg/l)

0

0 0 0 0 0 0 0 0 0 0 0 0

0

23

Cadmium (mg/l)

0.01

0.01 0.01 0.03 0.01 0.01 0.01 0.01

24

Copper (mg/l)

0.07

0.14 0.05 0.16 0.09 0.07 0.09 0.09 0.13 0.07 0.11 0.02 0.02

0.03

25

Lead (mg/l)

0

0 0 0 0 0 0 0 0 0 0 0 0

0

26

Chromium (mg/l)

0

0 0 0 0 0 0 0 0 0 0 0 0

0

27

Nickel

0.16

0.14 0.17 0.56 0.22 0.9 0.9 0.1 0.47 0.24 0.25 0.06 0.1

0.09

28

Zinc (mg/l)

2.6

2.39 2.14 2.08 0.9 2.18 1.88

29

Iron (mg/l)

0.86

2.12 0.83 3.48 23.39 0.74 0.31 0.31 1.22 0.69 0.58 0.49 0.5

0.4

BIO- MONITORING

30

Saprobic Score

5.92 6 6.7

31

Diversity Score

0.55 0.50 0.66

32

Water Quality

Moderate Slight Slight

33

Water Quality Class

C B B

34

Indicator Colour

Green Light Blue Light Blue

 

 

 

Sl. No PARAMETERS STATION CODE
2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905

1

Dissolved Oxygen (mg/l)

5.45

5.72 5.62 5.53

2

pH

7.76

7.67 7.72 7.45 7.93 7.27 5.9 7.18 6.90 7.04 7.78 7.33 6.64

7.13

3

Conductivity (µS/cm)

292.5

214.7 101.4 96.12 586 218 151.5 192 274 367.6 651 491.5 788

349

4

BOD (mg/l)

5.35

3.44 1.71 1.88

5

Nitrate- Nitrogen (mg/l)

1.73

1.37 0.24 0.25 0.06 0.05 1.59 0.12 2.88 1.4 0.12 0.29 5.2

0.11

6

Turbidity (NTU)

102.4

83.97 54.24 85.03 9.95 108.7 3.77 3.85 13.23 3.73 2.18 5.11 2.09

3.22

7

Phenolphthalein Alkalinity (mg/l)

0.02

0.22 0 0 1.4 0 0 0.2 0 0 0.15 0 0

0

8

Total Alkalinity (mg/l)

82.44

82.44 36 32 214 73 13 144 31 37 213 198 21

32

9

Chloride (mg/l)

68.80

40.02 7.87 5.86 78 22.2 47 2.1 46.5 6.65 1.8 35 205.5

117.5

10

Chemical Oxygen Demand (mg/l)

28.6

23.12 9.58 13 14 11.2 14.6 7.8 13.5 10.8 9.3 18.4 11

9.8

11

Ammonia Nitrogen (mg/l)

1.08

0.74 0.21 0.21 0.49 0.97 0.27 0.66 0.26 0.33 0.99 1.04 0.23

0.33

12

Total Hardness (mg/l)

89.66

72.77 39.33 45.11 248 67 39 48 51 53 115 183 191

74

13

Calcium Hardness (mg/l)

47.66

42.22 19.33 18.26 108 19 16 22 33 31 35 113 135

50

14

Magnesium Hardness (mg/l)

10.97

7.82 8.36 6.34 34.16 11.71 5.60 6.34 4.39 5.36 19.51 17.07 13.66

5.85

15

Sulphate (mg/l)

35.13

34.98 25.11 26 77.5 19 16.5 22.5 30 25 30 47 32.5

36.5

16

Total Dissolved Solids (mg/l)

135.7

106.8 52 48.04 293 109 75.85 96.05 137 183.5 325.5 245.5 394

174.5

17

Total Suspended Solids(mg/l)

0.28

0.20 0.18 0.19 0.04 0.02 0.02 0.01 0.05 0.09 0.13 0.15 0.57

0.16

18

Phosphate (mg/l)

0.22

0.17 0.11 0.07 0.04 0.08 0.22 0.17 0.2 0.11 0.26 0.15 0.14

0.13

19

Boron (mg/l)

0.58

0.34 0.09 0.16 0.12 0.45 0.05 0.07 0.05 0.17 0.05 0.44 0.09

0.55

20

Potassium (mg/l)

5.23

5.03 3.41 2.88 9.8 2.4 3.1 5.1 2.5 5 4 16.1 20

6.4

21

Fluoride (mg/l)

0.20

0.18 0.17 0.13 0.07 0.07 0.08 0.18 0.1 0.1 0.17 0.09 0.17

0.24

22

Arsenic (mg/l)

0.005

0.005 0 0 0 0 0 0.005 0.005 0.005 0 0 0

0

23

Cadmium (mg/l)

24

Copper (mg/l)

0.02

0.02 0.03 0.03 0.03 0.02 0.02 0.01 0.02 0.02 0.01 0.02 0.02

0.05

25

Lead (mg/l)

0

0 0 0 0 0 0 0 0 0 0 0 0 0

26

Chromium (mg/l)

0

0 0 0 0 0 0 0 0 0 0 0 0

0

27

Nickel

0.15 0.09 0.12 0.15 0.15 0.09 0.06 0.08 0.09 0.07 0.02 0.16 0.17

0.09

28

Zinc (mg/l)

29

Iron (mg/l)

0.64 0.42 1.12 0.76 0.62 1.24 0.47 1.5 0.37 0.27 0.37 0.18 0.07

0.65

 

                          Designated Best Use Classification of Inland Surface Water:

Class

Designated Best Use

Criteria

A

Drinking water source without conventional treatment but after disinfection pH: 6.5 to 8.5

Dissolved Oxygen: 6mg/l or more

Biochemical Oxygen Demand: 2mg/l or

Total Coliform: 50MPN/100ml

B

Outdoor bathing (Organized) pH: 6.5 to 8.5

Dissolved Oxygen: 5mg/l or more

Biochemical Oxygen Demand: 3mg/l or

Total Coliform: 500MPN/100ml

C

Drinking water source with conventional treatment followed by disinfection pH: 6.5 to 8.5

Dissolved Oxygen: 4mg/l or more

Biochemical Oxygen Demand: 3mg/l or Total Coliform: 5000 MPN/ml

D

Propagation of wildlife and fisheries pH: 6.5 to 8.5

Dissolved Oxygen: 4mg/l or more

Free Ammonia: 12mg/l

E

Irrigation, industrial cooling and controlled  waste disposal pH: 6 to 8.5

Electrical Conductivity: Max. 2250mhos/cm

Sodium Absorption Ratio: Max. 26

Boron: Max. 2mg/l

MPN – Most Probable Number

Inference:

Dissolved oxygen (DO) is the amount of oxygen present in the water in the dissolved form. In one of the drains at Naga Cemetery, Dimapur DO level was found very low on an average of 1.8 mg/l during 2017.  As per designated best use, DO should be above 4mg/l and in all the monitoring station it was recorded above the prescribed standards.

Biochemical oxygen demand (BOD) is a measure of the quantity of oxygen used by microorganisms (e.g., aerobic bacteria) in the oxidation of organic matter. BOD is one of the most important indicators of pollution. At the same station at Naga Cemetery, Dimapur, the highest BOD was observed at 13.89 mg/l while the least was analyzed as 1.84 mg/l at Dzudza Ru (Below Hydro) at Kohima. As per designated best use, BOD should be below 3mg/l however, the high levels of BOD may be attributed to the discharge of domestic wastewater mostly in untreated form and the municipal waste thrown directly into the water bodies without treatment. The relatively high levels of BOD can also be attributed to the presence of decaying organic matter. The other reason for high BOD level may be due to increased runoff from urban and agricultural fields.