Pl Dan Penman

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TABEL 1. KEBUTUHAN AIR UNTUK PENYIAPAN LAHAN

Eo + P

mm/hr S = 250 mm S = 300 mm S = 250 mm S = 300 mm

5 11.1 12.7 8.4 9.55.5 11.4 13 8.8 9.8

6 11.7 13.3 9.1 10.1

6.5 12 13.6 9.4 10.4

7 12.3 13.9 9.8 10.8

7.5 12.6 14.2 10.1 11.1

8 13 14.5 10.5 11.4

8.5 13.3 14.8 10.8 11.8

9 13.6 15.2 11.2 12.1

9.5 14 15.5 11.6 12.5

10 14.3 15.8 12 12.9

10.5 14.7 16.2 12.4 13.2

11 15 16.5 12.8 13.6

p (dari soal) =

T (30 hari) T (45 hari)


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Perhitungan

Bulan Eo + P PL Eo + P 30

Jan mm/hr S = 250 mm

Feb 5.0 11.1Mar 5.5 11.4

Apr 6.0 11.7

Mei 6.5 12.0

Jun 7.0 12.3

Jul 7.5 12.6

Ags 8.0 13.0

Sep 8.5 13.3

Okt 9.0 13.6

Nov 9.5 14.0

Des 10.0 14.3

10.5 14.7

11.0 15.0


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45 40

S = 250 mm S = 250 mm

8.4 9.38.8 9.7

9.1 10.0

9.4 10.3

9.8 10.6

10.1 10.9

10.5 11.3

10.8 11.6

11.2 12.0

11.6 12.4

12.0 12.8

12.4 13.2

12.8 13.5


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Tabel Perhitungan Evapotranspirasi Bulanan dengan Metode Penmann Modifikasi TAHUN 2

JAN FEB

1 Temperatur Udara C Data 27.5 27.3

2 Ea (ea) mbar Tabel 36.75 36.33

3 W Tabel 0.77 0.76

4 1-W Hitungan 0.24 0.24

5 f(t) Tabel 16.20 16.16

6 Kelembaban Relatif (RH) % Data 87.8 87.6

7 ed = ea x RH Hitungan 32.2665 31.82508

8 f(ed) = 0,34 - 0,044 (ed^0.5) Hitungan 0.09 0.09

9 Letak Lintang Daerah 80'0"LS Data 80'0"LS 80'0"LS

10 Ra mm/hari Tabel 16.10 16.10

11 Penyinaran Matahari, n/N % Data 57.90 69.40

12 Rs = (0,25 + 0,54 n/N) Ra Hitungan 9.06 10.06

13 Rns = (1-a)Rs , a=0,25 Hitungan 6.79 7.54

14 f(n/N) = 0,1 + 0,9 n/N Hitungan 0.62 0.72

15 Kecepatan Angin, u m/det Data 0.40 0.4316 f(u) = 0,27 {1+(u x 0,864)} Hitungan 0.36 0.37

17 Rn1 = f(t) x f(ed) x f(n/N) Hitungan 0.91 1.07

18 Rn = Rns - Rn1 mm/hari Hitungan 5.89 6.47

19 Angka Koreksi (c) Data 1.10 1.10

20 Eto* mm/hari Hitungan 4.89 5.33

21 Eto = c x Eto* mm/hari Hitungan 5.38 5.86

22 Jumlah hari dalam satu bulan hari hari 31 28

23 Eto mm mm 166.65 164.208001

Sumber: Hasil Perhitungan

NB: untuk lintang digunakan lintang daerah di jember, dan nilai c mengikuti data yang

interpolasi ea 36.75 36.33

interpolasi w 0.765 0.763

interpolasi f(t) 16.2 16.16

interpolasi ra 16.1 16.1

No URAIAN SATUAN KET.


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00

MAR APR MEI JUN JUL AGS SEP OKT

27.9 27.4 25.7 26.7 25.4 25.5 27.5 26.8

37.59 36.54 33.03 35.07 32.46 32.65 36.75 35.28

0.77 0.76 0.75 0.76 0.74 0.75 0.77 0.76

0.23 0.24 0.25 0.24 0.26 0.26 0.24 0.24

16.28 16.18 15.84 16.04 15.78 15.80 16.20 16.06

88.7 90.2 84.3 88 81.8 96.4 79.1 79.3

33.34233 32.95908 27.84429 30.8616 26.55228 31.4746 29.06925 27.97704

0.09 0.09 0.11 0.10 0.11 0.09 0.10 0.11

80'0"LS 80'0"LS 80'0"LS 80'0"LS 80'0"LS 80'0"LS 80'0"LS 80'0"LS

15.50 14.40 13.10 12.40 12.70 13.70 14.90 15.80

82.50 78.30 75.80 72.90 90.50 81.60 83.00 84.90

10.78 9.69 8.64 7.98 9.38 9.46 10.40 11.19

8.09 7.27 6.48 5.99 7.04 7.10 7.80 8.40

0.8425 0.80 0.78 0.76 0.91 0.83 0.85 0.86

0.44 0.44 0.40 0.29 0.74 0.54 0.97 0.890.37 0.37 0.36 0.34 0.44 0.40 0.50 0.48

1.18 1.14 1.34 1.16 1.63 1.23 1.41 1.49

6.91 6.13 5.14 4.83 5.40 5.87 6.39 6.91

1.00 1.00 0.95 0.95 1.00 1.00 1.10 1.10

5.68 5.00 4.32 4.00 4.69 4.49 5.79 6.08

5.68 5.00 4.10 3.80 4.69 4.49 6.36 6.69

31 30 31 30 31 31 30 31

175.980341 149.914095 127.154997 113.9817037 145.33216 139.20707 190.93264 207.30505

telah ada...

37.59 36.54 33.03 35.07 32.46 32.65 36.75 35.28

0.769 0.764 0.747 0.757 0.744 0.745 0.765 0.758

16.28 16.18 15.84 16.04 15.78 15.8 16.2 16.06

15.5 14.4 13.1 12.4 12.7 13.7 14.9 15.8

BULAN


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Tabel???? Hubungan antara T dengan Ea, W dan f(T) Tabel

Ea W (1-W)

NOV DES mbar

26.9 27.8 20 23.40 0.68 0.32 14.60 10

35.49 37.38 21 24.90 0.70 0.30 14.80 8

0.76 0.77 22 26.40 0.71 0.29 15.00 6

0.24 0.23 23 28.10 0.72 0.28 15.20 4

16.08 16.26 24 29.80 0.73 0.27 15.40 2

86.2 83.2 25 31.70 0.74 0.26 15.70 0

30.59238 31.10016 26 33.60 0.75 0.25 15.90

0.10 0.09 27 35.70 0.76 0.24 16.10 0

80'0"LS 80'0"LS 28 37.80 0.77 0.23 16.30 2

16.00 16.00 29 40.10 0.78 0.22 16.50 4

53.20 72.90 30 42.40 0.78 0.22 16.70 6

8.60 10.30 31 44.90 0.79 0.21 17.00 8

6.45 7.72 32 47.60 0.80 0.20 17.20 10

0.58 0.76 33 50.30 0.81 0.19 17.50 Sumb

0.46 0.62 34 53.20 0.81 0.19 17.700.38 0.41 35 56.20 0.82 0.18 17.90

0.90 1.16 36 59.40 0.83 0.17 18.10

5.55 6.56 37 62.80 0.84 0.16 18.30

1.15 1.15 38 66.30 0.84 0.16 18.50

4.66 5.64 39 69.90 0.85 0.15 18.70

5.35 6.49

30 31

160.64097 201.159983

35.49 37.38

0.759 0.768

16.08 16.26

16 16

Suhu

(T)

JAN

f(T)Elevasi 1-250 m Lintan

Lintan

Dat


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2.4 Nilai (Ra Radiasi) Ekstraterential (Angot) Setara Penguapan (mm/hari)

Jan Feb Mar Apr Mei Jun Jul Ags Sep Okt Nov Des

13.2 14.2 15.3 15.7 15.5 15.3 15.3 15.5 15.3 14.7 13.6 12.9

13.6 14.5 15.3 15.6 15.3 15.0 15.1 15.4 15.3 14.8 13.9 13.3

13.9 14.8 15.4 15.4 15.1 14.7 14.9 15.2 15.3 15.0 14.2 13.7

14.3 15.0 15.5 15.5 14.9 14.4 14.6 15.1 15.3 15.1 14.5 14.1

14.7 15.3 15.6 15.3 14.6 14.2 14.3 14.9 15.3 15.3 14.8 14.4

15.0 15.5 15.7 15.3 14.4 13.9 14.4 14.8 15.3 15.4 15.1 14.8

15.0 15.5 15.7 15.3 14.4 13.9 14.1 14.8 15.3 15.4 15.1 14.8

15.3 15.7 15.7 15.1 14.1 13.5 13.7 14.5 15.2 15.5 15.3 15.1

15.5 15.8 15.6 14.9 13.8 13.2 13.4 14.3 15.1 15.6 15.5 15.4

15.8 16.0 15.6 14.7 13.4 12.8 13.1 14.0 15.0 15.7 15.8 15.7

16.1 16.1 15.5 14.4 13.1 12.4 12.7 13.7 14.9 15.8 16.0 16.0

16.4 16.3 15.5 14.2 12.8 12.0 12.4 13.5 14.8 15.9 16.2 16.2

r : (Soewarno,2000:142)

8 0' 0''

LS

8 LS Ra =

10 LS Ra =ARI

g Utara

g Selatan

a Koordinat

8.000000000

Pl Dan Penman

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