S/N

Parameter

Unit

STATION

ANOVA

Upper reach

(n =37)

Mean ± S.E

Mid basin

(n = 26)

Mean ± S.E

Dam site

(n = 13)

Mean ± S.E

F

P

1

Water-Temperature

˚C

28.0 ± 0.3

28.4 ± 0.4

29.2 ± 0.5

1.763

0.179

2

Apparent-Colour

Pt-Co

619.9 ± 72.0

494.6 ± 59.5

341.7 ± 31.9

3.088

0.052

3

True-Colour

Pt-Co

168.3 ± 19.6

158.6 ± 17.3

161.9 ± 18.6

0.071

0.931

4

Turbidity

NTU

47.7 ± 6.9

37.3 ± 5.6

27.1 ± 3.9

1.913

0.155

5

Total Suspended Solids (TSS)

mgL−1

164.0 ± 20.9

152 ± 22.1

111.0 ± 11.2

1.079

0.345

6

Total Solids (TS)

mgL−1

220.0 ± 21.0

208 ± 22.5

170.0 ± 13.2

0.896

0.413

7

pH

0-14

6.44 ± 0.04

6.48 ± 0.06

6.50 ± 0.05

0.379

0.686

8

Conductivity

µScm−1

84.00 ± 3.50

83.00 ± 3.90

75.00 ± 2.40

1.185

0.312

9

Total Dissolved Solids (TDS)

mgL−1

56.00 ± 1.00

55.00 ± 2.70

50.00 ± 2.00

0.868

0.424

10

Total-Alkalinity

mgCaCO3L−1

22.10 ± 0.80

21.90 ± 0.60

22.20 ± 0.90

0.029

0.971

11

Total-Hardness

mgCaCO3L−1

11.54 ± 0.77

12.01 ± 0.98

10.38 ± 0.74

0.559

0.574

12

Total-Acidity

mgCaCO3L−1

14.00 ± 1.00

13.00 ± 1.00

12.00 ± 1.50

0.840

0.436

13

Calcium ion (Ca2+)

mgL−1

3.92 ± 0.26

4.13 ± 0.31

3.59 ± 0.26

0.571

0.567

15

Magnesium ion (Mg2+)

mgL−1

0.43 ± 0.06

0.39 ± 0.08

0.34 ± 0.08

0.286

0.752

16

Sodium ion (Na+)

mgL−1

6.42 ± 0.16

6.16 ± 0.17

5.93 ± 0.18

1.624

0.204

17

Potassium ion (K+)

mgL−1

2.56 ± 0.17

2.49 ± 0.21

2.11 ± 0.12

1.022

0.365

18

Bicarbonate ion ( HCO 3 − 1 )

mgL−1

26.50 ± 1.00

26.20 ± 0.80

26.60 ± 1.10

0.029

0.971

19

Chloride ion (Cl−1)

mgL−1

4.29 ± 0.18

4.39 ± 0.23

4.18 ± 0.30

0.150

0.861

20

Sulphate ion ( SO 4 2 − )

mgL−1

4.63 ± 0.18

4.81 ± 0.32

4.66 ± 0.52

0.121

0.887

21

Dissolved Oxygen (DO)

mgL−1

3.60 ± 0.30

4.20 ± 0.40

4.60 ± 0.50

1.803

0.172

22

Dissolved Oxygen Saturation

%

45.60 ± 4.00

54.10 ± 4.90

60.20 ± 6.60

2.022

0.140

23

Biochemical Oxygen Demand (BOD5)

mgL−1

4.30 ± 0.60

4.10 ± 0.60

3.20 ± 0.30

0.667

0.517

24

Organic-Matter (OM)

mgL−1

8.16 ± 0.58

7.45 ± 0.61

7.11 ± 1.06

0.588

0.558

25

Nitrate ion ( NO 3 − )

mgL−1

1.29 ± 0.14

1.13 ± 0.12

0.92 ± 0.09

1.505

0.229

26

Phosphate ( PO 4 3 − )

mgL−1

0.22 ± 0.01

0.23 ± 0.02

0.20 ± 0.02

0.809

0.449