S/N

Parameter

Unit

SEASON

ANOVA

Dry season

(n =18)

Mean ± S.E.

Rainy season

(n = 58)

Mean ± S.E.

F

P

1

Water-Temperature

˚C

27.9 ± 0.5

28.5 ± 0.3

1.345

0.250

2

Apparent-Colour

Pt-Co

586.8 ± 126.3

511.6 ± 39.7

2.295

0.134

3

True-Colour

Pt-Co

105.1 ± 10.2

182.1 ± 14.0

8.899

0.004**

4

Turbidity

NTU

48.0 ± 12.8

38.3 ± 3.5

1.059

0.307

5

Total Suspended Solids (TSS)

mgL⁻¹

181.0 ± 42.8

142.0 ± 110.5

1.674

0.120

6

Total Solids (TS)

mgL⁻¹

231.0 ± 42.8

200.0 ± 10.9

0.993

0.322

7

pH

0 - 14

6.68 ± 0.08

6.75 ± 0.03

13.50

0.0004***

8

Conductivity

µScm⁻¹

73.00 ± 1.60

85.00 ± 2.70

6.171

0.015*

9

Total Dissolved Solids (TDS)

mgL⁻¹

50.00 ± 1.30

56.00 ± 1.80

3.089

0.083

10

Total-Alkalinity

mgCaCO₃L⁻¹

22.10 ± 1.70

22.00 ± 0.40

0.017

0.898

11

Total-Hardness

mgCaCO₃L⁻¹

6.65 ± 0.49

13.01 ± 0.52

41.98

9.05 × 10⁻⁹***

12

Total-Acidity

mgCaCO₃L⁻¹

12.00 ± 1.00

14.00 ± 0.80

0.889

0.349

13

Calcium ion (Ca²⁺)

mgL⁻¹

2.36 ± 0.19

4.43 ± 0.17

40.650

1.4 × 10⁻⁸***

15

Magnesium ion (Mg²⁺)

mgL⁻¹

0.16 ± 0.02

0.47 ± 0.05

13.780

0.0004***

16

Sodium ion (Na⁺)

mgL⁻¹

6.29 ± 0.26

6.22 ± 0.11

0.114

0.737

17

Potassium ion (K⁺)

mgL⁻¹

1.67 ± 0.04

2.70 ± 0.13

18.820

4.48 × 10⁻⁵***

18

Bicarbonate ion ( ${\text{HCO}}_3^{-1}$ )

mgL⁻¹

26.50 ± 2.00

26.40 ± 0.40

0.017

0.898

19

Chloride ion (Cl⁻¹)

mgL⁻¹

4.16 ± 0.26

4.35 ± 0.15

0.393

0.533

20

Sulphate ion ( ${\text{SO}}_4^{2-}$ )

mgL⁻¹

3.98 ± 0.25

4.92 ± 0.19

6.573

0.012*

21

Dissolved Oxygen (DO)

mgL⁻¹

5.10 ± 0.40

3.60 ± 0.20

10.220

0.002**

22

Dissolved Oxygen Saturation

%

65.50 ± 5.00

46.50 ± 3.20

8.941

0.004**

23

Biochemical Oxygen Demand (BOD₅)

mgL⁻¹

3.90 ± 0.90

4.00 ± 0.40

0.018

0.895

24

Organic-Matter (OM)

mgL⁻¹

7.30 ± 1.00

7.87 ± 0.42

0.365

0.548

25

Nitrate ion ( ${\text{NO}}_3^{-}$ )

mgL⁻¹

1.47 ± 0.29

1.08 ± 0.05

4.391

0.040*

26

Phosphate ( ${\text{PO}}_4^{3-}$ )

mgL⁻¹

0.22 ± 0.02

0.22 ± 0.01

0.001

0.976