71
Menghitung tetapan-tetapan untuk persamaan intensitas hujan R
5
tahun
1. Talbot :
a = 46106,817 x 159978,212
−
2154759,874 x 1321,528 19 x 159978,212
−
1321,528 x 1321,528 = 3501,925
b = 1321,528 x 46106,817
−
19 x 2154759,874 19 x 159978,212
−
1321,528 x 1321,528 = 15,459
I = 3501,925
tc + 15,459
2. Sherman :
Log a = 32,814 x 54,483
−
48,891 x 30,235 19 x 54,483
−
30,235 x 30,235 = 2,558
a = 361,412
n = 32,814 x 30,235
−
19 x 48,891 19 x 54,483
−
30,235 x 30,235 = 0,522
I = 361,412
tc
,
522
3. Ishigura :
a = 6365,654 x 159978,212
−
442184,422 x 1321,528 19 x 159978,212
−
1321,528 x 1321,528 = 335,620
�
= 1321,528
�
6365,654
−
442184,422
19
�
159978,212
−
1321,528
�
1321,528
= 6,163
I = 335,620
√
tc + 6,163
72
Tabel 4.27 Perhitungan harga tiap suku untuk perhitungan tetapan-tetapan dalam rumus intensitas curah hujan untuk R
10
tahun
No. t
menit R
mm I
mmjam I x t
I² I²t
Log t Log I
Log t x Log I Log t² t
⁰′⁵ I.t
⁰′⁵ I²t
⁰′⁵ 1
1 4.801
288.062 288.062
82979.948 82979.948
0.000 2.459
0.000 0.000
1.000 288.062
82979.948 2
5 13.389
160.674 803.368
25815.996 129079.978
0.699 2.206
1.542 0.489
2.236 359.277
57726.321 3
10 20.677
124.060 1240.603
15390.948 153909.476
1.000 2.094
2.094 1.000
3.162 392.313
48670.450 4
15 26.093
104.372 1565.573
10893.415 163401.228
1.176 2.019
2.374 1.383
3.873 404.229
42190.016 5
20 30.673
92.020 1840.392
8467.609 169352.170
1.301 1.964
2.555 1.693
4.472 411.524
37868.296 6
25 34.430
82.632 2065.796
6828.020 170700.498
1.398 1.917
2.680 1.954
5.000 413.159
34140.100 7
30 37.789
75.578 2267.352
5712.094 171362.816
1.477 1.878
2.775 2.182
5.477 413.960
31286.427 8
35 40.705
69.780 2442.285
4869.189 170421.631
1.544 1.844
2.847 2.384
5.916 412.822
28806.513 9
40 43.355
65.032 2601.299
4229.224 169168.972
1.602 1.813
2.905 2.567
6.325 411.302
26747.963 10
45 45.733
60.978 2743.996
3718.277 167322.480
1.653 1.785
2.951 2.733
6.708 409.051
24942.963 11
50 47.924
57.509 2875.468
3307.326 165366.280
1.699 1.760
2.990 2.886
7.071 406.653
23386.324 12
55 49.954
54.496 2997.261
2969.776 163337.655
1.740 1.736
3.022 3.029
7.416 404.151
22024.445 13
60 51.417
51.417 3085.023
2643.714 158622.830
1.778 1.711
3.043 3.162
7.746 398.275
20478.119 14
90 59.882
39.921 3592.901
1593.696 143432.668
1.954 1.601
3.129 3.819
9.487 378.725
15119.131 15
120 65.682
32.841 3940.948
1078.546 129425.572
2.079 1.516
3.153 4.323
10.954 359.758
11814.884 16
150 70.092
28.037 4205.547
786.072 117910.841
2.176 1.448
3.150 4.735
12.247 343.381
9627.380 17
180 73.579
24.526 4414.744
601.542 108277.603
2.255 1.390
3.134 5.086
13.416 329.056
8070.536 18
210 76.414
21.833 4584.856
476.664 100099.536
2.322 1.339
3.110 5.393
14.491 316.385
6907.524 19
240 78.770
19.692 4726.184
387.792 93070.074
2.380 1.294
3.081 5.665
15.492 305.074
6007.647
∑ 1453.460
52281.658 182749.849 2727242.256 30.235 33.775
50.533 54.483
142.491 7157.155 538794.987
Sumber:Hasil analisa data
73
Menghitung tetapan-tetapan untuk persamaan intensitas hujan R
10
tahun
1. Talbot :
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