2 lampiran pengelolaan air irigasi.doc

Tabel 3.2. Harga prosentase rata-rata harian ( p ), jam siang tahunan untuk lintang berbeda-beda

UtaraLintang

Selatan

Jan.

Juli

Feb.

Agst.

Maret

Sept.

April

Okt.

Mei

Nop.

Juni

Des.

Juli

Jan.

Agst.

Feb.

Sept.

Maret

Okt.

April

Nop.

Mei

Des.

Juni

60 o

58565452

5048464442

4035302520151050

0.150.160.170.180.19

0.190.200.200.210.21

0.220.230.240.240.250.260.260.270.27

0.200.210.210.220.22

0.230.230.230.240.24

0.240.250.250.260.260.260.270.270.27

0.260.260.260.260.27

0.270.270.270.270.27

0.270.270.270.270.270.270.270.270.27

0.320.320.320.310.31

0.310.310.300.300.30

0.300.290.290.290.280.280.280.280.27

0.380.370.360.360.35

0.340.340.340.330.33

0.320.310.310.300.290.290.280.280.27

0.410.400.390.380.37

0.360.360.350.350.34

0.340.320.320.310.300.290.290.280.27

0.400.390.380.370.36

0.350.350.340.340.33

0.330.320.31*0.310.300.290.290.280.27

0.340.340.330.330.33

0.320.320.320.310.31

0.310.300.300.290.290.280.280.280.27

0.280.280.280.280.28

0.280.280.280.280.28

0.280.280.280.280.280.280.280.280.27

0.220.230.230.230.24

0.240.240.240.250.25

0.250.250.260.260.260.270.270.270.27

0.170.180.180.190.20

0.200.210.210.220.22

0.220.230.240.250.250.260.260.270.27

0.130.150.160.170.17

0.180.190.200.200.21

0.210.220.230.240.250.250.260.270.27

Tabel 3.4.a. Harga Ra dalam evaporasi ekivalen ( mm/hari )

Lintang Belahan bumi utaraJan. Feb. Maret April Mei Juni Juli Agst. Sept. Okt. Nop. Des.

50o

48464442

4038363432

3028262422

2018161412

1086420

3.84.34.95.35.9

6.46.97.47.98.3

8.89.39.810.210.7

11.211.612.012.412.8

13.213.613.914.314.715.0

6.16.67.17.68.1

8.69.09.49.810.2

10.711.111.511.912.3

12.713.013.313.613.9

14.214.514.815.015.315.5

9.49.810.210.611.0

11.411.812.112.412.8

13.113.413.713.914.2

14.414.614.714.915.1

15.315.315.415.515.615.7

12.713.013.313.714.0

14.314.514.714.815.0

15.215.315.315.415.5

15.615.615.615.715.7

15.715.715.415.515.315.3

15.815.916.016.116.2

16.416.416.416.516.5

16.516.516.416.416.3

16.316.116.015.815.7

15.515.315.114.914.614.4

17.117.217.217.217.3

17.317.217.217.117.0

17.016.816.716.616.4

16.416.115.915.715.5

15.315.014.714.414.213.9

16.416.516.616.616.7

16.716.716.716.816.8

16.8*16.716.616.516.4

16.316.115.915.715.5

15.315.114.914.614.314.1

14.114.314.514.715.0

15.215.315.415.515.6

15.715.715.715.815.8

15.915.815.715.715.6

15.515.415.215.114.914.8

10.911.211.511.912.2

12.512.813.113.413.6

13.914.114.314.514.6

14.814.915.015.115.2

15.315.315.315.315.315.3

7.47.88.38.79.1

9.610.010.610.811.2

11.612.012.312.613.0

13.313.613.914.114.4

14.714.815.015.115.315.4

4.55.05.56.06.5

7.07.58.08.59.0

9.59.910.310.711.1

11.612.012.412.813.3

13.613.914.214.514.815.1

3.23.74.34.75.2

5.76.16.67.27.8

8.38.89.39.710.2

10.711.111.612.012.5

12.913.313.714.114.414.8

Tabel 3.4.b. Harga Ra dalam evaporasi ekivalen ( mm/hari )

Lintang Belahan bumi selatanJan. Feb. Maret April Mei Juni Juli Agst. Sept. Okt. Nop. Des.

50o

48464442

4038363432

3028262422

2018161412

1086420

17.517.617.717.817.8

17.917.917.917.817.8

17.817.717.617.517.4

17.317.116.916.716.6

16.416.115.815.515.315.0

14.714.915.115.315.5

15.715.816.016.116.2

16.416.416.416.516.5

16.516.516.416.416.3

16.316.116.015.815.715.5

10.911.211.511.912.2

12.512.813.213.513.8

14.014.314.414.614.8

15.015.115.215.315.4

15.515.515.615.615.715.7

7.07.57.98.48.8

9.29.610.110.510.9

11.311.612.012.312.6

13.013.213.513.714.0

14.214.414.714.915.115.3

4.24.75.25.76.1

6.67.17.58.08.5

8.99.39.710.210.6

11.011.411.712.112.5

12.813.113.413.814.114.4

3.13.54.04.44.9

5.35.86.36.87.3

7.88.28.79.19.6

10.010.410.811.211.6

12.012.412.813.213.513.9

3.54.04.44.95.4

5.96.36.87.27.7

8.18.69.19.510.0

10.410.811.211.612.0

12.412.713.113.413.714.1

5.56.06.56.97.4

7.98.38.89.29.6

10.110.410.911.211.6

12.012.312.612.913.2

13.513.714.014.314.514.8

8.99.39.710.210.6

11.011.411.712.012.4

12.713.013.213.413.7

13.914.114.314.514.7

14.814.915.015.115.215.3

12.913.213.413.714.0

14.214.414.614.915.1

15.315.415.515.615.7

15.815.815.815.815.8

15.915.815.715.615.515.4

16.516.616.716.716.8

16.917.017.017.117.2

17.317.217.217.117.0

17.016.816.716.516.4

16.216.015.815.515.315.1

18.218.218.318.318.3

18.318.318.218.218.1

18.117.917.817.717.5

17.417.116.816.616.5

16.216.015.715.415.114.8

Tabel 3.5. Harga N untuk lintang yang berbeda-beda

Lintang UtaraLintang Selatan

Jan. Feb. Maret April Mei Juni Juli Agst. Sept. Okt. Nop. Des.Juli Agst. Sept. Okt. Nop. Des. Jan. Feb. Maret April Mei Juni

50o

4846444240

3530252015105

0

8.58.89.19.39.49.6

10.110.410.711.011.311.611.8

12.1

10.110.210.410.510.610.7

11.011.111.311.511.611.811.9

12.1

11.811.811.911.911.911.9

11.912.012.012.012.012.012.0

12.1

13.813.613.513.413.413.3

13.112.912.712.612.512.312.2

12.1

15.415.214.914.714.614.4

14.013.613.313.112.812.612.3

12.1

16.316.015.715.415.215.0

14.514.013.713.313.012.712.4

12.1

15.915.615.415.214.914.7

14.313.9*13.513.212.912.612.3

12.1

14.514.314.214.013.913.7

13.513.213.012.812.612.412.3

12.1

12.712.612.612.612.612.5

12.412.412.312.312.212.112.1

12.1

10.810.910.911.011.111.2

11.311.511.611.711.811.812.0

12.1

9.19.39.59.79.8

10.0

10.310.610.911.211.411.611.9

12.1

8.18.38.78.99.19.3

9.810.210.610.911.211.511.8

12.1

Tabel 3.7. Harga W sesuai temperatur dan ketinggian

Temperatur o C 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

W , pada ketinggian ( m )0

5001000200030004000

.43

.45

.46

.49

.52

.55

.46

.48

.49

.52

.55

.58

.49

.51

.52

.55

.58

.61

.52

.54

.55

.58

.61

.64

.55

.57

.58

.61

.64

.66

.58

.60

.61

.64

.66

.69

.61

.62

.64

.66

.69

.71

.64

.65

.66

.69

.71

.73

.66

.67

.69

.71

.73

.76

.68

.70

.71

.73

.75

.78

.71

.72

.73

.75

.77

.79

.73

.74

.75

.77

.79

.81

.75

.76

.77

.79

.81

.83

.77*.78.79.81.82.84

.78

.79

.80

.82

.84

.85

.80

.81

.82

.84

.85

.86

.82

.82

.83

.85

.86

.88

.83

.84

.85

.86

.88

.89

.84

.85

.86

.87

.88

.90

.85

.86

.87

.88

.89

.90

Tabel 3.8. Harga dari faktor (1 – W) pada suhu dan ketinggian yang berbeda

Temperatur oC 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

(1-W) at altitude m0

5001000200030004000

.57

.56

.54

.51

.48

.46

.54

.52

.51

.48

.45

.42

.51

.49

.48

.45

.42

.39

.48

.46

.45

.42

.39

.36

.45

.43

.42

.39

.36

.34

.42

.40

.39

.36

.34

.31

.39

.38

.36

.34

.31

.29

.36

.35

.34

.31

.29

.27

.34

.33

.31

.29

.27

.25

.32

.30

.29

.27

.25

.23

.29

.28

.27

.25

.23

.21

.27

.26

.25

.23

.21

.19

.25

.24

.23

.21

.19

.18

.23*.22.21.19.18.16

.22

.21

.20

.18

.16

.15

.20

.19

.18

.16

.15

.14

.19

.18

.17

.15

.14

.13

.17

.16

.15

.14

.13

.12

.16

.15

.14

.13

.12

.11

.15

.14

.13

.12

.11

.10

Tabel 3.9. Tabel ea dalam m bar sebagai fungsi temperatur udara rata-rata ( oC )

Temperatur oC 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

ea m bar 6.1 6.6 7.1 7.6 8.1 8.7 9.3 10.0 10.7 11.5 12.3 13.1 14.0 15.0 16.1 17.0 18.2 19.4 20.6* 22.0

Temperatur oC 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

ea m bar 23.4 24.9 26.4 28.1 29.8 31.7 33.6 35.7 37.8* 40.1 42.4 44.9 47.6 50.3 53.2 56.2 59.4 62.8 66.3 69.9

Catatan : Apabila temperatur yang dibaca merupakan titik embun, maka ( ea ) dalam tabel adalah ( ed )

Tabel 3.10.a. Tekanan uap (ed) dalam mbar dari temperatur bola kering dan bola basah (oC) (Aspirated Psychrometer – tipe Assman)

Bola keringTo C

Depresi temperatur bola basah ( To C ) ketinggian 0 – 1000 m0 2 4 6 8 10 12 14 16 18 20 22

4038363432

3028262422

2018161412

1086420

73.866.359.453.247.5

42.437.833.629.826.4

23.420.618.216.014.0

12.310.79.38.17.16.1

64.958.151.946.241.1

36.532.328.525.122.0

19.316.814.612.710.9

9.48.06.85.74.84.0

56.850.544.939.835.1

30.927.223.8

20.7*18.0

15.513.311.49.68.1

6.75.54.43.42.82.0

49.243.638.433.829.6

25.822.419.416.614.2

12.010.08.36.75.3

4.13.12.11.60.8

42.237.132.528.324.5

21.118.015.312.810.6

8.76.95.44.02.8

1.70.8

35.831.126.923.219.8

16.714.011.59.37.4

5.64.12.71.5

29.825.621.818.415.4

12.610.28.06.04.3

2.71.4

24.320.517.114.011.3

8.86.74.72.91.4

19.215.812.710.07.5

5.33.41.6

14.411.48.66.24.0

10.17.34.9

6.0

Tabel 3.10.b. Tekanan uap (ed) dalam mbar dari temperatur bola kering dan bola basah (oC) (Aspirated Psychrometer – tipe Assman)

Bola keringTo C


4038363432

3028262422

2018161412

1086420

73.866.359.453.247.5

42.437.833.629.826.4

23.420.618.216.014.0

12.310.79.38.17.16.1

65.258.252.146.441.3

36.732.528.725.322.3

19.517.114.912.911.2

9.68.27.06.05.04.1

57.150.945.240.135.5

31.327.524.121.118.3

15.913.711.710.08.4

7.05.84.83.82.92.1

49.844.139.034.430.2

26.423.020.017.214.3

12.610.68.97.35.9

4.73.72.71.81.0

43.037.933.329.125.3

21.918.916.113.911.5

9.57.86.24.81.4

2.61.60.7

41.836.732.124.120.7

17.714.912.510.38.3

6.65.03.62.4

0.4

31.026.823.019.616.6

13.811.49.27.25.5

3.92.51.30.3

25.621.818.415.412.6

10.28.06.04.32.7

1.30.1

20.717.314.311.59.1

6.94.93.21.60.2

16.213.210.48.05.8

3.82.10.5

12.09.26.84.62.6

0.9

8.15.73.51.5

Tabel 3.11.a. Tekanan uap ( ed ) dalam m bar dari temperatur bola kering dan bola basah ( oC ) ( Non – Ventilated Psychrometer )

Tabel 3.11.b. Tekanan uap ( ed ) dalam m bar dari temperatur bola kering dan bola basah ( oC ) ( Non – Ventilated Psychrometer )

Bola keringTo C


4038363432

3028262422

2018161412

1086420

73.866.359.453.247.5

42.437.833.629.826.4

23.420.618.216.014.0

12.310.79.38.17.16.1

64.757.851.645.940.8

36.232.028.224.821.8

19.016.614.412.410.7

9.17.76.55.54.53.7

56.250.044.439.234.6

30.426.623.220.217.4

15.012.810.89.17.5

6.14.93.92.92.31.5

48.442.837.633.028.8

25.021.618.615.813.4

11.29.27.55.94.6

3.32.31.50.9

41.236.031.427.223.4

20.017.014.211.89.6

7.65.94.33.01.7

0.7

34.429.825.621.818.4

15.412.610.28.06.0

4.32.71.40.1

28.224.020.216.813.8

11.08.66.44.42.7

1.1

22.418.615.212.29.4

7.04.82.81.1

17.013.610.67.85.4

3.21.2

12.09.06.23.81.6

7.44.62.2

3.00.6

Bola keringTo C


4038363432

3028262422

2018161412

1086420

73.866.359.453.247.5

42.437.833.629.826.4

23.420.618.216.014.0

12.310.79.38.17.16.1

64.958.051.846.141.0

36.432.228.425.022.0

19.216.814.612.610.9

9.37.96.75.74.73.8

56.750.544.839.735.1

30.927.123.720.717.9

15.513.311.39.68.0

6.75.44.43.42.51.7

49.143.438.333.729.5

25.722.319.316.514.1

11.99.98.26.65.2

4.03.02.01.10.3

42.036.932.328.124.3

20.917.915.112.710.5

8.56.85.23.82.6

1.60.6

35.631.026.823.019.6

16.613.811.49.27.2

5.53.92.51.30.3

29.625.421.218.215.2

12.410.07.85.84.1

2.51.1

34.120.316.913.911.1

8.76.54.52.81.2

18.915.512.59.77.3

5.13.11.4

14.111.18.35.93.7

1.7

9.87.04.62.40.4

5.63.21.0

Tabel 3.12. Harga f ( T ) → Rnl = f ( T ) . f ( ed ) . f ( n/N )

To C

f ( T ) = Tk4

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36

11.0 11.4 11.7 12.0 12.4 12.7 13.1 13.5 13.8 14.2 14.6 15.0 15.4 15.9 16.3* 16.7 17.2 17.7 18.1

Tabel 3.13. Harga f ( ed ) → Rnl = f ( T ) . f ( ed ) . f ( n/N )

ed mbar

f ( ed ) = 0.34 – 0.044

6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

0.23 .22 .20 .19 .18 .16 .15 .14 .13* .12 .12 .11 .10 .09 .08 .08 .07 .06

Tabel 3.14. Harga f ( n/N ) → Rnl = f ( T ) . f ( ed ) . f ( n/N )

n / N

f ( n/N ) = 0.1 + 0.9 n/N

0 .05 .10 .15 .20 .25 .30 .35 .40 .45 .50 .55 .60 .65 .70 .75 .80 .85 .90 .95 1.0

0.10 .15 .19 .24 .28 .33 .37 .42 .46 .51 .55 .60 .64 .69 .73 .78 .82* .87 .91 .96 1.0

Tabel 3.16. Harga dari f ( u ) = 0.27 ( 1 + ) Pada tinggi 2 meter dinyatakan dalam km / hari

Anginkm / hari 0 10 20 30 40 50 60 70 80 90

100200300400500600700800900

-0.540.811.081.351.621.892.162.432.70

0.300.570.841.111.381.651.922.192.46

0.320.590.861.131.401.671.942.212.48

0.350.620.89*1.161.431.701.972.242.51

0.380.650.921.191.461.732.002.272.54

0.410.670.941.211.491.762.022.292.56

0.430.700.971.241.511.782.052.322.59

0.460.731.001.271.541.812.082.352.62

0.490.761.031.301.571.842.112.382.64

0.510.781.051.321.591.902.152.402.65

Tabel 3.17. Faktor penyesuaian ( c ) untuk persamaan Penman dengan modifikasi FAO

Rs mm/hariU siang m/det

Rhmax = 30% Rhmax = 60% Rhmax = 90%

3 6 9 12 3 6 9 12 3 6 9 12

U siang / U malam = 4.00369

0.860.790.680.55

0.900.840.770.65

1.000.920.870.78

1.000.970.930.90

0.960.920.850.76

0.981.000.960.88

1.051.111.111.02

1.051.191.191.14

1.020.990.940.88

1.061.101.101.01

1.101.271.261.16

1.101.321.331.27


0.860.760.610.46

0.900.810.680.56

1.000.880.810.72

1.000.940.880.82

0.960.870.770.67

0.980.960.880.79

1.051.061.020.88

1.051.121.101.05

1.020.940.860.78

1.061.041.010.92

1.101.181.151.06

1.101.281.221.18


0.860.690.530.37

0.900.760.610.48

1.000.850.740.65

1.000.920.840.76

0.960.830.700.59

0.980.910.800.70

1.050.99*0.940.84

1.051.05*1.020.95

1.020.890.790.71

1.060.980.920.81

1.101.10*1.050.96

1.101.14*1.121.06


0.860.640.430.27

0.900.710.530.41

1.000.820.680.59

1.000.890.790.70

0.960.780.620.50

0.980.860.700.60

1.050.94*0.840.75

1.050.99*0.930.87

1.020.850.720.62

1.060.920.820.72

1.101.01*0.950.87

1.101.05*1.000.96

Gambar 3.1. Penentuan Nilai ETo Metode Blaney-Criddle

Gambar 3.2. Penentuan Nilai ETo Metode Radiasi

2 lampiran pengelolaan air irigasi.doc

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