F.J. MOCK JOON KI

PERHITUNGAN DEBIT ANDALAN DENGAN METODE DR. F.J. MOCK No

Data

A

Meteorologi Data

Unit

1 Curah hujan

B

P;mm/bulan

D

Februari

Maret

April

Mei

Juni

Juli

Agustus

112.89

80.98

80.56

47.83

164.32

32.87

70.90

157.10

12

15

13

10

10

7

9

28

31

30

31

30

31

31

2 Hari hujan

n;hari

3 Jumlah hari

Hr;hari

31 3.57

3.59

3.73

3.08

3.45

2.62

2.47

2.92

mm/bulan

110.67

100.52

115.63

92.40

106.95

78.60

76.57

90.52

5 Expose Surface (m)

%

20.00

20.00

30.00

20.00

20.00

20.00

30.00

40.00

6 E/Eto=(m/20) x (18-n)

%

2.00

6.00

4.50

5.00

8.00

8.00

16.50

18.00

7 E = (6) x Epm

mm/bulan

2.21

6.03

5.20

4.62

8.56

6.29

12.63

16.29

8 EI = Epm - E

mm/bulan

108.46

94.49

110.43

87.78

98.39

72.31

63.94

74.23

Evapotranspirasi Potensial (Eto)

mm/hari

Limited Evapotranspirasi (EI)

Water Surplus 9 (P - EI) 10 SMS = ISMS + (P-EI) 11 SMC

E

Januari

16

4 Epm C

Kons

mm/bulan

4.44

-13.51

-29.87

-26.09

65.93

-39.44

6.97

82.88

mm/bulan

254.44

198.23

131.90

84.89

150.82

32.08

76.16

332.88

211.74

161.77

110.98

84.89

71.52

69.19

250.00

248.21

ISMC

250

12 Soil storage

mm/bulan

0.00

13.51

29.87

26.09

0.00

39.44

0.00

0.00

13 Water surplus (8+11)

mm/bulan

4.44

0.00

0.00

0.00

65.93

0.00

6.97

82.88

14 Koefisien Infiltrasi

(if)

0.40

0.40

0.40

0.40

0.40

0.40

0.40

0.40

15 Infiltrasi (13 x 14)

(i;mm/bulan)

1.77

0.00

0.00

0.00

26.37

0.00

2.79

33.15

16 Konstanta resesi aliras

(K)

0.60

0.60

0.60

0.60

0.60

0.60

0.60

0.60

(PF)

0.10

0.10

0.10

0.10

0.10

0.10

0.10

0.10

18 1/2 x (1+K) x i

1.42

0.00

0.00

0.00

21.10

0.00

2.23

26.52

19 K x Vn-1

82.74

50.50

30.30

18.18

10.91

19.20

11.52

8.25

Total Run Off

17 Percentage factor

20 Vn

Vn-1

137.9

84.16

50.50

30.30

18.18

32.00

19.20

13.75

34.77

-33.66

-20.20

-12.12

13.83

-12.80

-5.45

21.02

21 ΔVn=Vn-(Vn-1)

mm/bulan

-53.74

22 Base Flow = i - ΔVn

mm/bulan

55.51

33.66

20.20

12.12

12.55

12.80

8.24

12.13

23 Direct Run Off = WS - i

mm/bulan

2.66

0.00

0.00

0.00

39.56

0.00

4.18

49.73

24 Storm run off=PxPF(jika P>250,SRO=0)

mm/bulan

11.29

8.10

8.06

6.17

16.43

3.29

7.09

15.71

25 Total Run Off=Bflow+DRO+SRO

mm/bulan

69.47

41.76

28.25

18.29

68.53

16.09

19.51

77.57

26 Catchment Area

km²

3174.25

3174.25

3174.25

3174.25

3174.25

3174.25

3174.25

3174.25

27 Stream flow (m3/second)

(m³/det)

82.33

49.49

33.48

21.67

81.22

19.07

23.12

91.93

September

Oktober

Nopember

Desember

164.81

145.62

92.09

89.40

12

12

14

10

30

31

30

31

4.33

2.59

2.88

3.34

129.90

80.29

86.40

103.54

30.00

20.00

40.00

30.00

9.00

6.00

8.00

12.00

11.69

4.82

6.91

12.42

118.21

75.47

79.49

91.12

46.60

70.15

12.60

-1.72

294.81

320.15

262.60

248.28

250.00

250.00

250.00

250.00

0.00

0.00

0.00

1.72

46.60

70.15

12.60

0.00

0.40

0.40

0.40

0.40

18.64

28.06

5.04

0.00

0.60

0.60

0.60

0.60

0.10

0.10

0.10

0.10

14.91

22.45

4.03

0.00

20.86

21.46

26.35

18.23

35.77

43.91

30.38

18.23

1.00

8.14

-13.53

-12.15

17.64

19.92

18.57

12.15

27.96

42.09

7.56

0.00

16.48

14.56

9.21

8.94

62.08

76.57

35.34

21.09

3174.25

3174.25

3174.25

3174.25

73.57

90.75

41.88

25.00

13.38

= Debit Andalan

PERHITUNGAN EVAPOTRANSPIRASI ( Eto) DENGAN METODE PEN MAN

BULAN

SUHU (T)

ea (mbar)

RH (%)

ed (mbar)

(ea-ed) (km/hr)

u

f (u)





w

1-w

Ra

n/hari

(mm/hr) ( % )

N (jam)

n/N (%)

Rs (mm/hr)

Januari

29.00

40.16

90.00

36.14

4.02

63.20 0.44

2.32

0.66

0.78

0.22 14.80

2.84 12

0.24

4.79

Februari

26.50

34.70

86.00

29.84

4.86

68.50 0.45

2.04

0.66

0.76

0.24 14.80

2.14 12

0.18

4.37

Maret

25.50

32.70

84.00

27.47

5.23

84.80 0.50

1.93

0.66

0.75

0.25 14.80

2.26 12

0.19

4.45

April

31.00

45.05

82.00

36.94

8.11

121.20 0.60

2.56

0.66

0.79

0.21 14.80

2.50 12

0.21

4.81

Mei

27.00

35.73

80.00

28.59

7.15

170.10 0.73

2.09

0.66

0.76

0.24 14.80

2.48 12

0.21

4.58

Juni

19.00

22.01

76.00

16.72

5.28

158.40 0.70

1.37

0.66

0.68

0.32 14.80

2.67 12

0.22

4.69

Juli

17.00

19.40

70.00

13.58

5.82

163.50 0.71

1.23

0.65

0.65

0.35 14.80

2.77 12

0.23

4.75

Agustus

23.00

28.15

72.00

20.27

7.88

116.40 0.58

1.70

0.66

0.72

0.28 14.80

2.74 12

0.23

4.73

September

24.50

30.81

80.00

24.65

6.16

93.20 0.52

1.84

0.66

0.74

0.26 14.80

2.93 12

0.24

4.84

Oktober

21.50

25.69

90.00

23.12

2.57

69.01 0.46

1.57

0.66

0.70

0.30 14.80

1.94 12

0.16

4.26

Nopember

20.50

24.16

85.00

20.53

3.62

0.00 0.27

1.48

0.66

0.69

0.31 14.80

2.17 12

0.18

4.39

0.29 14.80

1.94 12

0.16

4.26

Desember

22.00

26.49

80.00

21.19

5.30

0.00 0.27

1.61

0.66

0.71

Rns (mm/hr)

Rn1 (mm/hr)

Rn (mm/hr)

c

Eto (mm/hr)

3.59

0.36

3.23

1

2.90

3.28

0.40

2.88

1

2.72

3.33

0.45

2.88

1

2.81

3.61

0.32

3.29

1

3.61

3.43

0.46

2.97

1

3.51

3.52

0.74

2.78

1

3.07

3.56

0.84

2.72

1

3.21

3.55

0.67

2.88

1

3.36

3.63

0.60

3.03

1

3.08

3.19

0.49

2.71

1

2.25

3.29

0.57

2.73

1

2.19

3.19

0.52

2.67

1

2.31