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Tabel Perhitungan Evapotranspirasi Potensial dengan Metode Penmann Modifikasi NO.
URAIAN
LAMBANG SATUAN
JAN
FEB
MAR
APR
MEI
JUN
JUL
AGT
SEPT
OKT
NOV
DES
°C
27.03
27.07
27.50
27.30
27.73
27.14
26.93
26.79
26.93
27.01
27.05
27.03
RH
%
81.00
79.75
78.83
79.92
80.50
81.75
80.58
77.25
78.00
78.08
78.83
79.83
u
km/jam
10.33
10.00
11.83
10.67
12.33
10.00
14.00
10.33
14.17
11.00
12.17
13.50
Penyinaran Matahari
n/N
%
23.00
22.25
21.53
22.58
21.62
22.85
22.60
22.88
21.87
22.35
22.67
22.27
5
Tekanan Uap Jenuh
ea
mbar
36.06
35.80
36.71
36.28
37.24
37.37
35.50
33.32
34.86
35.76
35.77
35.71
6
Tekanan Uap Nyata
ed
mbar
29.21
28.55
28.94
28.99
29.98
30.55
28.60
25.74
27.19
27.92
28.20
28.51
7
Fungsi Angin
f(U)
2.681
2.603
3.030
2.758
3.147
2.603
3.536
2.681
3.575
2.836
3.108
3.419
8
W
0.765
0.766
0.770
0.768
0.772
0.766
0.764
0.763
0.764
0.765
0.766
0.765
9
Faktor Pembobotan
1
Temperatur
2
Kelembaban Relatif
3
Kecepatan Angin
4
10 Radiasi Ekstra Tereksterial 11
Faktor Albedo
t
1-W
1-W
0.235
0.234
0.230
0.232
0.228
0.234
0.236
0.237
0.236
0.235
0.235
0.235
Ra
mm/hari
14.87
15.34
15.39
14.95
14.12
1.92
13.72
14.44
15.07
15.22
14.86
14.67
0.08
0.08
0.08
0.08
0.08
0.08
0.08
0.08
0.08
0.08
0.08
0.08
r
12 Radiasi Sinar Matahari
Rs
mm/hari
0.37
0.37
0.37
0.37
0.37
0.37
0.37
0.37
0.37
0.37
0.37
0.37
13 Radiasi Gel Pendek Neto
Rns
mm/hari
0.34
0.34
0.34
0.34
0.34
0.34
0.34
0.34
0.34
0.34
0.34
0.34
14 Fungsi Temperatur
f(t)
16.107
16.113
16.200
16.160
16.247
16.128
16.085
16.058
16.087
16.102
16.150
16.105
15 Fungsi Tekanan Uap Nyata
f(ed)
0.102
0.105
0.103
0.103
0.099
0.097
0.105
0.117
0.111
0.107
0.106
0.105
16 Fungsi Penyinaran Matahari
f(n/N)
0.307
0.300
0.294
0.303
0.295
0.306
0.303
0.306
0.297
0.301
0.304
0.300
17 Radiasi Gelombang Netto
Rnl
mm/hari
0.505
0.507
0.492
0.505
0.474
0.477
0.511
0.574
0.528
0.521
0.522
0.508
18 Radiasi Netto
Rn
mm/hari
-0.161
-0.167
-0.155
-0.163
-0.137
-0.134
-0.169
-0.230
-0.189
-0.180
-0.180
-0.168
19 Faktor Koreksi
c
1.1
1.1
1.0
0.9
0.9
0.9
0.9
1.0
1.1
1.1
1.1
1.1
4.605
4.724
5.296
4.084
4.587
3.639
5.055
4.641
6.947
5.592
5.919
6.218
20 Evapotranspirasi Potensial
Eto
mm/hari
Harga-harga ea, w, (1 - w), dan f(t) berdasarkan temperatur (t) Suhu o C
ea mbar
w (1 - w) e1 (0 - 250 m)
24.0
29.85
0.735
0.265
15.40
24.2
30.21
0.737
0.263
15.45
24.4
30.57
0.739
0.261
15.50
24.6
30.94
0.741
0.259
15.55
24.8
31.31
0.743
0.257
15.60
25.0
31.69
0.745
0.255
15.65
25.2
32.06
0.747
0.253
15.70
25.4
32.45
0.749
0.251
15.75
25.6
32.83
0.751
0.249
15.80
25.8
33.22
0.753
0.247
15.85
26.0
33.62
0.755
0.245
15.90
26.2
34.02
0.757
0.243
15.94
26.4
34.42
0.759
0.241
15.98
26.6
34.83
0.761
0.239
16.02
26.8
33.25
0.763
0.237
16.06
27.0
35.66
0.765
0.235
16.10
27.2
36.09
0.767
0.233
16.14
27.4
36.50
0.769
0.231
16.18
27.6
36.94
0.771
0.229
16.22
27.8
37.37
0.773
0.227
16.26
28.0
37.81
0.775
0.225
16.30
28.2
38.25
0.777
0.223
16.34
28.4
38.70
0.779
0.221
16.38
28.6
39.14
0.781
0.219
16.42
28.8
39.61
0.783
0.217
16.46
29.0
40.06
0.785
0.215
16.50
Sumber : Suhardjono, Ajar Mandiri, 1991
f(t)
Hubungan nilai Rs dengan Ra dan n/N Rs = (0,25 + 0,54 n/N)
Ra
Persentase kecerahan matahari n/N (%) 20
30
40
50
60
70
80
90
12.0
4.3
4.9
5.6
6.2
6.9
7.5
8.2
8.8
12.2
4.4
5.0
5.7
6.3
7.0
7.7
8.3
9.0
12.4
4.4
5.1
5.8
6.4
7.1
7.8
8.5
9.1
12.6
4.5
5.2
5.9
6.6
7.2
7.9
8.6
9.3
12.8
4.6
5.3
6.0
6.7
7.3
8.0
8.7
9.4
13.0
4.7
5.4
6.1
6.8
7.5
8.2
8.9
9.6
13.2
4.7
5.4
6.2
6.9
7.6
8.3
9.0
9.7
13.4
4.8
5.5
6.2
7.0
7.7
8.4
9.1
9.9
13.6
4.9
5.6
6.3
7.1
7.8
8.5
9.3
10.0
13.8
4.9
5.7
6.4
7.2
7.9
8.7
9.4
10.2
14.0
5.0
5.8
6.5
7.3
8.0
8.8
9.5
10.3
14.2
5.1
5.9
6.6
7.4
8.2
8.9
9.7
10.5
14.4
5.2
5.9
6.7
7.5
8.3
9.0
9.8
10.6
14.6
5.2
6.0
6.8
7.6
8.4
9.2
10.0
10.7
14.8
5.3
6.1
6.9
7.7
8.5
9.3
10.1
10.9
15.0
5.4
6.2
7.0
7.8
8.6
9.4
10.2
11.0
15.2
5.4
6.3
7.1
7.9
8.7
9.5
10.4
11.2
15.4
5.5
6.3
7.2
8.0
8.8
9.7
10.5
11.3
15.6
5.6
6.4
7.3
8.1
9.0
9.8
10.6
11.5
15.8
5.7
6.5
7.4
8.2
9.1
9.9
10.8
11.6
16.0
5.7
6.6
7.5
8.3
9.2
10
10.9
11.8
16.2
5.8
6.7
7.5
8.4
9.3
10.2
11.0
11.9
Min
4.3
4.9
5.6
6.2
6.9
7.5
8.2
8.8
Max
5.8
6.7
7.5
8.4
9.3
10.2
11.0
11.9
Rerata
5.1
5.8
6.6
7.3
8.1
8.9
9.6
10.4
Sumber : Suhardjono, 1989 : 45
Hubungan antara (ea) dan (ed) untuk berbagai keadaan (RH) dalam penggunaan rumus Penman ea m.bar
Harga ed = ea * RH 55
60
65
70
75
80
85
29.50
16.23
17.70
19.18
20.65
22.13
23.60
25.07
29.75
16.36
17.85
19.34
20.82
22.31
23.80
25.29
30.00
16.50
18.00
19.50
21.00
22.50
24.00
25.50
30.25
16.64
18.15
19.66
21.18
22.69
24.20
25.71
30.50
16.77
18.30
19.82
21.35
22.88
24.40
25.93
30.75
16.91
18.45
19.99
21.52
23.06
24.60
26.14
31.00
17.05
18.60
20.15
21.70
23.25
24.80
26.35
31.25
17.19
18.75
20.31
21.88
23.44
25.00
26.56
31.50
17.32
18.90
20.48
22.05
23.63
25.20
26.77
31.75
17.46
19.05
20.64
22.23
23.81
25.40
26.99
32.00
17.60
19.20
20.80
22.40
24.00
25.60
27.20
32.25
17.74
19.35
20.96
22.57
24.19
25.80
27.41
32.50
17.88
19.50
21.13
22.75
24.38
26.00
24.63
32.75
18.01
19.65
21.29
22.93
24.56
26.20
27.84
33.00
18.15
19.80
21.45
23.10
24.75
26.40
28.05
33.25
18.29
19.95
21.61
23.27
24.94
26.60
28.26
33.50
18.43
20.10
21.44
23.45
25.13
26.80
28.48
33.75
18.56
20.25
21.94
23.63
25.31
27.00
28.69
34.00
18.70
20.40
22.10
23.80
25.50
27.20
28.90
34.25
18.84
20.55
22.25
23.98
25.69
27.40
29.11
34.50
18.98
20.70
22.43
24.15
25.88
27.60
29.32
34.75
19.11
20.85
22.59
24.32
26.06
27.80
29.54
35.00
19.25
21.00
22.75
24.50
26.25
28.00
29.75
35.25 35.50 35.75
19.39 19.52 19.66
21.15 21.30 21.45
22.91 23.07 23.24
24.68 24.85 25.02
26.44 26.63 26.81
28.20 28.40 28.60
29.96 30.18 30.39
36.00 36.25 36.50 36.75
19.80 19.94 20.07 20.21
21.60 21.75 21.90 22.05
23.40 23.56 23.73 23.89
25.20 25.38 25.55 25.73
27.00 27.19 27.38 27.56
28.80 29.00 29.20 29.40
30.60 30.81 31.02 31.24
Sumber : Suhardjono, 1989 : 46
Harga f(ed) guna perhitungan rumus Penmann ed
f(ed) = 0,34 - 0,044 (ed)^0,5
m.bar
,0
,25
,5
,75
15
0.170
0.168
0.167
0.165
16
0.164
0.163
0.161
0.160
17
0.159
0.157
0.156
0.155
18
0.153
0.152
0.151
0.149
19
0.148
0.147
0.146
0.144
20
0.143
0.142
0.141
0.140
21
0.138
0.137
0.136
0.135
22
0.134
0.132
0.131
0.130
23
0.129
0.128
0.127
0.126
24
0.124
0.123
0.122
0.121
25
0.120
0.119
0.118
0.117
26
0.116
0.115
0.113
0.112
27
0.111
0.110
0.109
0.108
28
0.107
0.106
0.105
0.104
29
0.103
0.102
0.101
0.100
30
0.099
0.098
0.097
0.096
31
0.095
0.094
0.093
0.092
32
0.091
0.090
0.089
0.088
33
0.087
0.086
0.085
0.840
34
0.083
0.082
0.082
0.081
35
0.080
0.079
0.078
0.077
36
0.076
0.075
0.074
0.073
Sumber : Suhardjono, 1989 : 47
Harga f(n/N) guna perhitungan rumus Penmann n/N
f(n/N) = 0,1 + 0,9 n/N
(%)
,0
,2
,4
,6
,8
30
0.370
0.388
0.406
0.424
0.442
40
0.460
0.478
0.496
0.514
0.532
50
0.550
0.568
0.586
0.604
0.622
60
0.640
0.658
0.676
0.694
0.712
70
0.730
0.748
0.766
0.784
0.802
80
0.820
0.838
0.856
0.874
0.892
Sumber : Suhardjono,1989 : 47
Harga f(u) guna perhitungan rumus Penmann u
f(u) = 0,27 (1 + u x 0,864)
(m/dt)
,0
,2
,4
,6
,8
0
0.270
0.317
0.363
0.410
0.457
1
0.503
0.550
0.597
0.643
0.690
2
0.737
0.783
0.830
0.877
0.923
3
0.970
1.016
1.063
1.110
1.156
4
1.203
1.250
1.296
1.343
1.390
Sumber : Suhardjono, 1989 : 47
Besar angka koefisien bulanan (c) untuk rumus Penmann Bulan
c
Bulan
c
Januari
1.1
Juli
0.9
Februari
1.1
Agustus
1.0
Maret
1.0
September
1.1
April
0.9
Oktober
1.1
Mei
0.9
November
1.1
Juni
0.9
Desember
1.1
Sumber : Suhardjono, 1989 : 49
Tabel Rangking Tahunan Curah Hujan Harian Bulan Januari JCHH (mm/hari) Tahun 202.5 1993 170 1994 109 1995 62.2 1991 62.2 1992 59.5 1990
Bulan Februari JCHH (mm/hari) Tahun 152.3 1995 85.5 1994 37.2 1990 29.5 1993 20.4 1991 20.4 1992
Bulan Maret JCHH (mm/hari) Tahun 228.5 1994 208.4 1995 175.5 1993 112.4 1991 112.4 1992 58 1990
Bulan April JCHH (mm/hari) 210.7 210 159.5 129 102 102
Bulan Mei JCHH (mm/hari) 346.5 254.5 252 148.3 148.3 102.5
Bulan Juni JCHH (mm/hari) 133 132.5 129.5 129.5 98 28.3
Bulan Juli JCHH (mm/hari) 225.8 135.5 132.5 132.5 108.5 68.5
Tahun 1990 1995 1991 1992 1993 1994
Bulan Agustus JCHH (mm/hari) Tahun 165.5 1994 163 1991 158 1992 126 1995 86 1990 1993
Bulan November JCHH (mm/hari) Tahun 316 1990 297 1994 294 1993 294 1995 209.5 1991 209.5 1992
Bulan Desember JCHH (mm/hari) Tahun 239 1991 234 1992 217 1993 175 1995 169 1990 60.5 1994
Tahun 1994 1995 1993 1991 1992 1990
Bulan September JCHH (mm/hari) Tahun 283.4 1990 191.5 1992 191 1991 148.8 1995 134.5 1994 129.1 1993
Tahun 1994 1995 1991 1992 1993 1990
Bulan Oktober JCHH (mm/hari) Tahun 431.8 1990 284.5 1993 278.5 1995 131 1994 94.2 1991 94.2 1992
Tahun 1994 1995 1990 1993 1991 1992
Tabel 3.3. Curah Hujan Efektif untuk Tanaman Padi Bulan 15 harian
Jan
Feb
Mar
Apr
Mei
Jun
I
II
I
II
I
II
I
II
I
II
I
II
R80 (mm/hari)
19.00
151.00
61.00
24.50
143.50
64.90
105.00
105.00
136.00
118.50
69.00
63.50
Re (mm/15 hari)
13.30
105.70
42.70
17.15
100.45
45.43
73.50
73.50
95.20
82.95
48.30
44.45
Re (mm/ hari)
0.89
7.05
2.85
1.14
6.70
3.03
4.90
4.90
6.35
5.53
3.22
2.96
Bulan 15 harian
3.97
2.00
4.86
4.90
5.94
3.09
Jul
Agt
Sept
Okt
Nov
Des
I
II
I
II
I
II
I
II
I
II
I
II
R80 (mm/hari)
67.00
68.50
50.00
113.00
104.00
87.50
88.00
196.50
112.50
184.50
63.50
170.50
Re (mm/15 hari)
46.90
47.95
35.00
79.10
72.80
61.25
61.60
137.55
78.75
129.15
44.45
119.35
Re (mm/ hari)
3.13
3.20
2.33
5.27
4.85
4.08
4.11
9.17
5.25
8.61
2.96
7.96
3.16
3.80
4.47
6.64
6.93
5.46
Mei
Jun
Tabel 3.4. Curah Hujan Efektif untuk Tanaman Palawija Bulan 15 harian
Jan
Feb
Mar
Apr
I
II
I
II
I
II
I
II
I
II
I
II
R80 (mm/hari)
66.00
43.00
15.00
22.20
146.50
29.00
79.00
80.50
172.50
79.50
95.00
34.50
Re (mm/15 hari)
46.20
30.10
10.50
15.54
102.55
20.30
55.30
56.35
120.75
55.65
66.50
24.15
Re (mm/ hari)
3.08
2.01
0.70
1.04
6.84
1.35
3.69
3.76
8.05
3.71
4.43
1.61
Bulan 15 harian
2.54
0.87
4.10
3.72
5.88
3.02
Jul
Agt
Sept
Okt
Nov
Des
I
II
I
II
I
II
I
II
I
II
I
II
R80 (mm/hari)
66.00
66.50
45.00
113.00
103.50
87.50
63.00
215.50
200.00
94.00
77.00
140.00
Re (mm/15 hari)
46.20
46.55
31.50
79.10
72.45
61.25
44.10
150.85
140.00
65.80
53.90
98.00
Re (mm/ hari)
3.08
3.10
2.10
5.27
4.83
4.08
2.94
10.06
9.33
4.39
3.59
6.53
3.09
3.69
4.46
6.50
6.86
5.06
Data Tahun
: Temperatur Maksimum Bulan Jan
Feb
Mar
Apr
Mei
Jun
Jul
Agt
Sept
Okt
Nov
Des
1992
31.60
31.90
32.10
32.20
31.90
31.70
31.60
33.10
32.30
32.80
31.50
31.20
1993
30.70
33.00
33.20
31.60
31.70
32.40
30.80
31.30
31.90
31.80
31.40
31.80
1994
31.90
31.80
31.70
32.40
31.90
33.30
31.20
30.60
31.90
33.50
32.10
30.90
1995
32.60
31.80
31.10
32.70
32.20
31.30
31.40
31.50
32.90
32.50
31.70
31.60
1996
31.00
31.70
32.10
32.20
32.30
31.70
31.40
32.20
32.50
31.20
32.40
31.60
1997
31.40
30.80
32.10
32.10
33.00
31.90
31.30
32.40
31.80
31.80
32.60
32.50
Min
30.70
30.80
31.10
31.60
31.70
31.30
30.80
30.60
31.80
31.20
31.40
30.90
Max
32.60
33.00
33.20
32.70
33.00
33.30
31.60
33.10
32.90
33.50
32.60
32.50
Rerata
31.53
31.83
32.05
32.20
32.17
32.05
31.28
31.85
32.22
32.27
31.95
31.60
Data Tahun
: Temperatur Minimum Bulan Jan
Feb
Mar
Apr
Mei
Jun
Jul
Agt
Sept
Okt
Nov
Des
1992
22.80
21.20
21.40
21.50
22.40
22.10
21.90
21.10
22.10
21.80
22.60
23.00
1993
20.00
22.50
22.80
22.80
22.80
21.40
21.70
21.90
20.40
22.10
20.90
22.00
1994
22.80
22.70
23.70
22.30
23.00
22.10
22.80
20.90
20.60
20.70
22.10
22.00
1995
22.00
23.20
22.90
22.90
23.40
22.60
23.00
22.10
21.40
21.30
22.90
22.60
1996
22.60
21.80
24.30
22.50
23.50
22.60
24.50
21.40
22.00
22.20
22.00
22.90
1997
25.00
22.40
22.60
22.40
24.70
22.60
21.50
23.00
23.40
22.40
22.40
22.20
Min
20.00
21.20
21.40
21.50
22.40
21.40
21.50
20.90
20.40
20.70
20.90
22.00
Max
25.00
23.20
24.30
22.90
24.70
22.60
24.50
23.00
23.40
22.40
22.90
23.00
Rerata
22.53
22.30
22.95
22.40
23.30
22.23
22.57
21.73
21.65
21.75
22.15
22.45
Data
: Perhitungan Temperatur Rata-rata
Bulan
Jan
Feb
Mar
Apr
Mei
Jun
Jul
Agt
Sept
Okt
Nov
Des
Min
22.53
22.30
22.95
22.40
23.30
22.23
22.57
21.73
21.65
21.75
22.15
22.45
Max
31.53
31.83
32.05
32.20
32.17
32.05
31.28
31.85
32.22
32.27
31.95
31.60
Rerata
27.03
27.07
27.50
27.30
27.73
27.14
26.93
26.79
26.93
27.01
27.05
27.03
Data Tahun
: Rata-rata Penyinaran Matahari Bulan Jan
Feb
Mar
Apr
Mei
Jun
Jul
Agt
Sept
Okt
Nov
Des
1992
22.20
23.00
22.30
22.40
21.10
22.60
21.70
22.30
20.60
22.20
22.80
21.70
1993
24.00
22.60
22.50
23.20
21.00
22.60
22.70
22.90
22.60
23.10
22.00
22.70
1994
23.00
20.90
21.30
22.70
21.80
22.60
22.40
22.50
21.70
22.30
22.90
22.40
1995
23.20
22.10
22.10
23.20
22.20
23.70
22.40
22.40
22.60
22.30
22.40
22.80
1996
22.60
22.90
20.40
22.20
21.90
22.60
23.00
23.80
21.20
21.40
22.10
22.00
1997
23.00
22.00
20.60
21.80
21.70
23.00
23.40
23.40
22.50
22.80
23.80
22.00
Min
22.20
20.90
20.40
21.80
21.00
22.60
21.70
22.30
20.60
21.40
22.00
21.70
Max
24.00
23.00
22.50
23.20
22.20
23.70
23.40
23.80
22.60
23.10
23.80
22.80
Rerata
23.00
22.25
21.53
22.58
21.62
22.85
22.60
22.88
21.87
22.35
22.67
22.27
Data Tahun
: Rata-Rata Kecepatan Angin (km/jam) Bulan Jan
Feb
Mar
Apr
Mei
Jun
Jul
Agt
Sept
Okt
Nov
Des
1992
15.00
11.00
13.00
15.00
15.00
8.00
12.00
12.00
8.00
12.00
11.00
20.00
1993
10.00
10.00
15.00
10.00
13.00
12.00
20.00
12.00
10.00
10.00
12.00
15.00
1994
8.00
15.00
15.00
8.00
12.00
8.00
29.00
10.00
12.00
12.00
13.00
10.00
1995
8.00
5.00
11.00
8.00
8.00
8.00
6.00
8.00
20.00
10.00
12.00
9.00
1996
13.00
10.00
8.00
15.00
17.00
9.00
8.00
8.00
29.00
12.00
8.00
9.00
1997
8.00
9.00
9.00
8.00
9.00
15.00
9.00
12.00
6.00
10.00
17.00
18.00
Min
8.00
5.00
8.00
8.00
8.00
8.00
6.00
8.00
6.00
10.00
8.00
9.00
Max
15.00
15.00
15.00
15.00
17.00
15.00
29.00
12.00
29.00
12.00
17.00
20.00
Rerata
10.33
10.00
11.83
10.67
12.33
10.00
14.00
10.33
14.17
11.00
12.17
13.50
Rerata
2.8704 2.7778
3.287
2.963
3.4259 2.7778 3.8889 2.8704 3.9352 3.0556 3.3796
3.75
Data Tahun
: Kelembaban Minimum Bulan Jan
Feb
Mar
Apr
Mei
Jun
Jul
Agt
Sept
Okt
Nov
Des
1992
68.00
64.00
64.00
63.00
66.00
66.00
60.00
56.00
60.00
65.00
66.00
64.00
1993
60.00
62.00
50.00
69.00
63.00
69.00
65.00
57.00
56.00
60.00
63.00
72.00
1994
67.00
57.00
65.00
59.00
64.00
69.00
68.00
66.00
62.00
53.00
65.00
68.00
1995
66.00
67.00
67.00
64.00
68.00
63.00
68.00
66.00
59.00
66.00
60.00
61.00
1996
67.00
64.00
60.00
64.00
64.00
66.00
61.00
43.00
64.00
56.00
58.00
65.00
1997
65.00
64.00
62.00
63.00
65.00
67.00
65.00
64.00
65.00
62.00
57.00
54.00
Min
60.00
57.00
50.00
59.00
63.00
63.00
60.00
43.00
56.00
53.00
57.00
54.00
Max
68.00
67.00
67.00
69.00
68.00
69.00
68.00
66.00
65.00
66.00
66.00
72.00
Rerata
65.50
63.00
61.33
63.67
65.00
66.67
64.50
58.67
61.00
60.33
61.50
64.00
Data Tahun
: Kelembaban Maksimum Bulan Jan
Feb
Mar
Apr
Mei
Jun
Jul
Agt
Sept
Okt
Nov
Des
1992
97.00
97.00
97.00
96.00
96.00
97.00
96.00
96.00
95.00
97.00
96.00
97.00
1993
97.00
96.00
96.00
98.00
96.00
97.00
97.00
98.00
93.00
97.00
95.00
95.00
1994
96.00
96.00
97.00
97.00
96.00
96.00
97.00
94.00
95.00
97.00
97.00
96.00
1995
96.00
97.00
95.00
96.00
95.00
97.00
97.00
97.00
96.00
94.00
98.00
96.00
1996
97.00
98.00
96.00
96.00
96.00
97.00
97.00
97.00
95.00
93.00
95.00
95.00
1997
96.00
95.00
97.00
94.00
97.00
97.00
96.00
93.00
96.00
97.00
96.00
95.00
Min
96.00
95.00
95.00
94.00
95.00
96.00
96.00
93.00
93.00
93.00
95.00
95.00
Max
97.00
98.00
97.00
98.00
97.00
97.00
97.00
98.00
96.00
97.00
98.00
97.00
Rerata
96.50
96.50
96.33
96.17
96.00
96.83
96.67
95.83
95.00
95.83
96.17
95.67
Data
: Kelembaban Relatif (%)
Bulan
Jan
Feb
Mar
Apr
Mei
Jun
Jul
Agt
Sept
Okt
Nov
Des
Min
65.50
63.00
61.33
63.67
65.00
66.67
64.50
58.67
61.00
60.33
61.50
64.00
Max
96.50
96.50
96.33
96.17
96.00
96.83
96.67
95.83
95.00
95.83
96.17
95.67
Rerata
81.00
79.75
78.83
79.92
80.50
81.75
80.58
77.25
78.00
78.08
78.83
79.83
Tabel Kebutuhan Air Selama Penyiapan Lahan Eo + P
T = 30 hari
T = 45 hari
mm/hari
S = 250 mm
S = 300 mm
S = 250 mm
S = 300 mm
5.0
11.1
12.7
8.4
9.5
5.5
11.4
13.0
8.8
9.8
6.0
1.7
13.3
9.1
10.1
6.5
12.0
13.6
9.4
10.4
7.0
12.3
13.9
9.8
10.8
7.5
12.6
14.2
10.1
11.1
8.0
13.0
14.5
10.5
11.4
8.5
13.3
14.8
10.8
11.8
9.0
13.6
15.2
11.2
12.1
9.5
14.0
15.5
11.6
12.5
10.0
14.3
15.8
12.0
12.9
10.5
14.7
16.2
12.4
13.2
11.0
15.0
16.5
12.8
13.6
Tabel Perhitungan Kebutuhan Air Untuk Pola Tanam Padi - Padi - Palawija Bulan
No.
Periode 15 harian ke-
1 Pola Tanam
Satuan
Jul I
Agt II
I
Sept II
I
Okt II
I
Penyiapan
mm/hr
Nov II
I
Des II
I
mm/hr
5.58
5.58
5.00
5.00
5.50
5.50
5.73
5.73
5.20
a. Kc1
LP
1.10
1.10
1.05
1.05
0.95
0.00
b. Kc2
LP
LP
1.10
1.10
1.05
1.05
0.95
d. Kc
LP
LP
1.10
1.08
1.05
1.00
0.48
0.93
1.96
2.36
3.24
3.85
1.61
2.00
2.00
2.00
2.00
2.00
2.00
2.20
2.20
1.10
1.10
I
Feb II
I
Penyiapan
Padi I 5.20
Mar II
I
Apr II
I
Mei II
I
Padi II
Lahan
Lahan 2 Evapotranspirasi potensial (Eto)
Jan II
Tabel Kebutuhan Air S Jun II
I
II
Palawija
5.35
5.35
5.70
5.70
5.26
5.26
6.08
6.08
5.41
5.41
5.37
5.37
5.09
5.09
LP
1.10
1.10
1.05
1.05
0.95
0.00
0.50
0.75
1.00
1.00
0.82
0.45
LP
0.00
LP
LP
1.10
1.10
1.05
1.05
0.95
0.00
0.50
0.75
1.00
1.00
0.82
0.45
0.00
LP
LP
1.10
1.08
1.05
1.00
0.48
0.25
0.63
0.88
1.00
0.91
0.64
LP
3.64
6.88
5.09
3.55
4.41
4.32
3.36
1.70
0.00
7.30
5.58
4.95
6.25
3.17
4.62
3.71
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.20
2.20
1.10
1.10 7.60
3 Koefisien Tanaman (Kc)
4 Curah Hujan Efektif (Re)
mm/hr
5 Perkolasi (P)
mm/hr
6 Penggantian Lapisan Air (WLR)
mm/hr
2.31
0.00
7 M = Eo + P
7.50
8.05
8.05
8.30
8.30
7.72
7.72
7.89
8.27
8.27
7.79
7.79
8.69
8.69
7.95
7.95
7.91
7.91
7.60
8 Keb. Air Tanaman (Etc)
mm/hr
12.60 12.60
7.50
6.05
5.91
6.02
5.73
2.47
0.00 12.91 12.91
6.27
6.13
5.52
5.26
2.89
1.52
3.38
4.73
5.37
4.89
3.23 12.68
9 Kebutuhan Air Bersih di sawah (NFR)
mm/hr
11.67 10.64
7.89
6.87
5.27
7.22
0.00
0.00
7.82
9.36
6.06
6.01
5.26
6.66
2.89
0.00
0.00
0.00
0.00
1.71
0.00
8.97
10 NFR = NFR/8,64
lt/dt/ha
0.91
0.80
0.61
0.84
0.00
0.00
0.91
1.08
0.70
0.70
0.61
0.77
0.33
0.00
0.00
0.00
0.00
0.20
0.00
1.04
1.35
1.23
7.89
Sumber : Hasil Perhitungan
Keterangan : Ø Kebutuhan air bersih di sawah (NFR) maksimum terdapat pada bulan Desember periode 15 harian I, yaitu sebesar 11.29 mm/hari atau 1.31 lt/dt/ha
2.31
5.58
0.00
4.95
0.93
6.25
1.96
3.17
2.36
4.62
3.24
3.71
3.85
1.61
3.64
6.88
5.09
3.55
4.41
4.32
3.36
1.70
0.00
7.30
tuhan Air Selama Penyiapan Lahan Eo + P
T = 30 hari
mm/hari
S = 250 mm
S = 300 mm
S = 250 mm
T = 45 hari S = 300 mm
5.0
11.1
12.7
8.4
9.5
5.5
11.4
13.0
8.8
9.8
6.0
1.7
13.3
9.1
10.1
6.5
12.0
13.6
9.4
10.4
7.0
12.3
13.9
9.8
10.8
7.5
12.6
14.2
10.1
11.1
8.0
13.0
14.5
10.5
11.4
8.5
13.3
14.8
10.8
11.8
9.0
13.6
15.2
11.2
12.1
9.5
14.0
15.5
11.6
12.5
10.0
14.3
15.8
12.0
12.9
10.5
14.7
16.2
12.4
13.2
11.0
15.0
16.5
12.8
13.6
NO SALURAN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 25
A1KA A2KI A2KA A3KI A3KA A4KI A4KA A5KI A5KA A6KI A6KA A7KI A7KA B1KI B1KA B2KI B2KA B3KI B3KA B4KI B4KA B5KI B5KA
PETAK YANG DIAIRI NO. LUAS (ha) PETAK 150.992 99.91 194.75 181.35 152.82 117.64 97.94 126.60 80.58 156.60 157.16 142.23 157.48 180.20 124.71 147.38 162.67 150.31 183.65 203.71 248.54 256.77 195.46
NFR Maks (l/dt/ha) 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35 1.35
KAPASITAS KAPASITAS Q Q (l/dt) (m3/dt) 254.80 168.60 328.64 306.03 257.88 198.52 165.27 213.64 135.98 264.25 265.20 240.01 265.75 304.09 210.45 248.70 274.51 253.65 309.91 343.76 419.41 433.30 329.84
0.25 0.17 0.33 0.31 0.26 0.20 0.17 0.21 0.14 0.26 0.27 0.24 0.27 0.30 0.21 0.25 0.27 0.25 0.31 0.34 0.42 0.43 0.33
Tabel 4.12 Dimensi Saluran
SP 1 SP 2 SS1 SS2 SS3 SS4 SS5 SS6 SS7 SS8 SS9 SS10 SS11 SS12
Q m3/dt 3.47 5.16 2.31 1.75 1.38 1.04 0.51 3.22 2.09 1.53 0.76 0.85 0.59 0.26
SP 1 SP 2 SS1 SS2 SS3 SS4 SS5 SS6 SS7 SS8 SS9 SS10 SS11 SS12
5.6 1.02 2.63 2.6 1.8 1.62 2.37 3.43 2.86 2.6 2.8 3.03 2.54 2.8
NO.
SALURAN
1 2 3 4 5 6 7 8 9 10 11 12 13 14
1.50 1.50 1.50 1.50 1.00 1.00 1.00 1.50 1.50 1.50 1.00 1.00 1.00 1.00
V m/dt 0.60 0.65 0.55 0.55 0.53 0.52 0.45 0.60 0.60 0.55 0.50 0.50 0.45 0.30
A m2 5.789 7.940 4.205 3.179 2.613 1.991 1.124 5.360 3.483 2.775 1.526 1.701 1.309 0.860
L 280000 51000 131500 130000 90000 81000 118500 171500 143000 130000 140000 151500 127000 140000
∆h 31.99 5.69 15.22 18.12 11.76 12.22 19.60 20.62 22.32 19.84 23.31 23.46 18.97 11.83
32 6 15 18 12 12 20 21 22 20 23 24 19 12
m
b/h
h (m)
b (m)
3.0 3.5 2.5 2.5 2.0 2.0 2.0 3.0 2.5 2.5 2.0 2 2 1
1.134 1.260 1.025 0.892 0.933 0.815 0.612 1.091 0.933 0.833 0.713 0.753 0.661 0.656
3.403 4.411 2.563 2.229 1.867 1.629 1.224 3.274 2.333 2.082 1.427 1.506 1.321 0.656
P (m) 7.492 8.954 6.260 5.443 4.506 3.933 2.955 7.209 5.697 5.086 3.444 3.636 3.190 2.511
R (m) 0.773 0.887 0.672 0.584 0.580 0.506 0.380 0.744 0.611 0.546 0.443 0.468 0.410 0.343
I x 10-4 1.142 1.116 1.157 1.394 1.307 1.508 1.654 1.203 1.561 1.526 1.665 1.549 1.494 0.845
Tinggi Jagaan F (m) 0.6 0.6 0.6 0.6 0.5 0.5 0.5 0.6 0.6 0.6 0.5 0.5 0.5 0.3
NO. SALURAN 1 2 3 4 5 6 7 8 9 10 11
SP 1 SS1 SS2 SS3 SP 2 SS4 SS5 SS6 SS7 SS8 SS9
Q M3/dt
m
2.18 1.28 0.71 0.35 4.53 2.09 1.53 0.76 0.85 0.59 0.26
1.50 1.00 1.00 1.00 1.50 1.50 1.50 1.00 1.00 1.00 1.00
c
V m/dt
A m2
b/h
h (m)
b (m) P(m) R(m)
I x 10-4
