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Flood vulnerability assessment of donstream area in Mono basin in Yoto district, south-eastern Togo


par Abravi Essenam KISSI
University of Lome - Master 2014
  

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Annexe 4: Mann-Kendall results of annual , monthly and seasonal flow for the study area

Months

Mann Kendall test

 

Mann Kendall

Statistic (Zc)

p-value (two tailed test)

alpha

Sen's slope estimate

Test Interpretation

Mar

62.000

< 0,0001

0.05

2.233

Reject H0

Apr

50.000

< 0,0001

0.05

2.031

Reject H0

May

52.000

< 0,0001

0.05

2.289

Reject H0

June

26.000

0.014

0.05

0.910

Reject H0

Jul

14.000

0.202

0.05

-1.354

Accept H0

Aug

-14.000

0.202

0.05

-3.391

Accept H0

Sept

-26

0.014

0.05

-4.697

Reject H0

Oct

6.000

0.624

0.05

-0.047

Accept H0

Nov

30.000

0.0004

0.05

2.295

Reject H0

Dec

48.000

< 0,0001

0.05

3.433

Reject H0

Jan

50.000

< 0,0001

0.05

2.653

Reject H0

Feb

56.000

< 0,0001

0.05

2.135

Reject H0

Annual

262

0.002

0.05

2.462

Reject H0

High rainy season

456

0.000

0.05

3.416

Reject H0

High dry season

436

0.000

0.05

2.663

Reject H0

Small dry season

80

0.357

0.05

1.392

Accept H0

Small rainy season

54

0.537

0.05

1.125

Accept H0

Feb

56.000

< 0,0001

0.05

2.135

Reject H0

Annual

262

0.002

0.05

2.462

Reject H0

High rainy season

456

0.000

0.05

3.416

Reject H0

High dry season

436

0.000

0.05

2.663

Reject H0

Small dry season

80

0.357

0.05

1.392

Accept H0

Small rainy season

54

0.537

0.05

1.125

Accept H0

Annexe 5: calculation for Return Period of 2010 Flood, Mono River

Water Year

Rank

Ranked discharge

Return period

Exceedence probability

2000

1

736.70

41

0.02

1971

2

731.68

21

0.05

2007

3

709.11

14

0.07

2001

4

665.12

10

0.10

2003

5

615.93

8

0.12

1981

6

591.77

7

0.15

1986

7

588.35

6

0.17

1980

8

552.91

5

0.20

2010

9

549.65

5

0.22

1999

10

526.23

4

0.24

2005

11

471.37

4

0.27

1992

12

463.27

3

0.29

1975

13

444.23

3

0.32

1988

14

440.94

3

0.34

1990

15

436.73

3

0.37

1972

16

425.99

3

0.39

1989

17

424.81

2

0.41

2008

18

402.60

2

0.44

1982

19

350.72

2

0.46

1976

20

337.38

2

0.49

2002

21

331.09

2

0.51

1974

22

329.98

2

0.54

2006

23

315.35

2

0.56

1978

24

289.35

2

0.59

1977

25

257.10

2

0.61

2004

26

256.97

2

0.63

1979

27

252.48

2

0.66

1995

28

251.82

1

0.68

1973

29

247.67

1

0.71

1985

30

240.60

1

0.73

1991

31

227.13

1

0.76

1998

32

225.49

1

0.78

1983

33

212.32

1

0.80

1987

34

200.91

1

0.83

1994

35

196.56

1

0.85

1993

36

166.30

1

0.88

1997

37

139.64

1

0.90

1996

38

137.94

1

0.93

2009

39

80.17

1

0.95

1984

40

69.16

1

0.98

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