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Environmental Systems Research

Table 6 Variability and trends of mean water level of Lake Hayk (1999–2005)

From: Climate variability and trends in the Endorheic Lake Hayk basin: implications for Lake Hayk water level changes in the lake basin, Ethiopia

Time period

Minimum

(m)

Maximum

(m)

Mean

(m)

SD

CV (%)

P values

(2 tailed)

Sen’s slope

Jan

0.22

0.84

0.63

0.22

34.79

0.260

0.03

Feb

0.31

0.65

0.51

0.13

24.76

0.260

0.02

Mar

0.75

2.85

1.87

0.70

37.34

0.260

0.32

Apr

1.55

2.56

2.07

0.40

19.16

0.260

0.09

May

0.26

1.22

0.90

0.34

37.45

0.260

0.04

Jun

0.71

1.17

0.98

0.16

15.81

0.260

0.06

Jul

1.74

3.99

2.83

0.71

24.99

0.260

0.19

Aug

1.81

3.93

2.91

0.67

22.98

0.452

0.20

Sep

1.66

2.74

2.29

0.37

15.93

0.707

0.12

Oct

0.98

2.05

1.54

0.43

27.75

0.970

0.05

Nov

1.08

1.90

1.45

0.37

25.34

0.970

0.05

Dec

0.30

1.61

1.20

0.47

39.26

0.970

0.05

Kiremt

1.48

2.75

2.25

0.41

18.03

0.452

0.12

Belg

1.21

1.99

1.61

0.31

19.37

0.260

0.11

Bega

1.14

1.82

1.52

0.24

15.49

0.452

0.07

Annual

1.15

1.90

1.60

0.25

15.63

0.452

0.09

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