Post on 07-Aug-2015
description
XII - 9
Laboratorium Hidrolika
Jurusan Sipil Fakultas Teknik
Universitas Hasanuddin
12.5 Tabel Pengamatan Percobaan Rainfall Simulator
Waktu (t) : 10 menit
Variasi
Volume Kontainer (Q)
V Kont. 1 V Kont. 2 V Kont. 3 V Kont. 4 V Kont. 5
(ml) (ml) (ml) (ml) (ml) (ml)
1
30
44 43 38 37 27 37.8Putaaran Piringan (rpm) 100
Tekanan Pompa (bar) 0.6
2
30
39 42 33 36 31 36.2Putaaran Piringan (rpm) 110
Tekanan Pompa (bar) 0.6
3
30
47.5 41 31 40 29 37.7Putaaran Piringan (rpm) 120
Tekanan Pompa (bar) 0.6
4
30
50 22 10.5 38 27 29.5Putaaran Piringan (rpm) 130
Tekanan Pompa (bar) 0.5
5
30
46 17.5 15.5 40.5 27 29.3Putaaran Piringan (rpm) 130
Tekanan Pompa (bar) 0.4
6
30
40 33.5 33 43 33 36.5Putaaran Piringan (rpm) 130
Tekanan Pompa (bar) 0.3
Kelompok X1V1 Bagus Febrianto D 111 06 618 Makassar, 5 Agustus 20082 A. Sutra Jaya D 111 06 625 Asisten Laboratorium,3 Zulfikar A. Parana D 111 07 9104 Munandar Fachri Reza D 111 07 9145 Rieski Restu Amelia D 111 07 915 ( Nataniel Stone )
Vrata-rata
Bukaan Piringan ( o)
Bukaan Piringan ( o)
Bukaan Piringan ( o)
Bukaan Piringan ( o)
Bukaan Piringan ( o)
Bukaan Piringan ( o)
XII-16
12.6. Perhitungan Rainfall Simulator
12.6.1. Menghitung Intensitas Curah Hujan
1. Variasi 1
Diketahui data :
= 30
Putaran piringan (rpm) = 100
Tekanan pompa (bar) = 0.6
Volume container :
* Volume container 1 = 44 ml
* Volume container 2 = 43 ml
* Volume container 3 = 38 ml
* Volume container 4 = 37 ml
* Volume container 5 = 27 ml
Volume container rata-rata (m) = 37.8 ml
Luas container ( A ) = 41.833
Waktu ( t ) = 10 menit
Banyak pengamatan ( n ) = 5
Menghitung intensitas curah hujan
I =Q
x 600A x t
~ I cont 1 =44
x 600 = 63.109 mm/jam41.833 x 10
~ I cont 2 =43
x 600 = 61.674 mm/jam41.833 x 10
~ I cont 3 =38
x 600 = 54.503 mm/jam41.833 x 10
~ I cont 4 =37
x 600 = 53.069 mm/jam41.833 x 10
~ I cont 5 =27
x 600 = 38.726 mm/jam41.833 x 10
Menghitung Intensitas Rata-Rata
~ =Q
x 600A x t
=37.800
x 600 = 54.2160 mm/jam41.833 x 10
Bukaan piringan (o)
cm2
Irata-rata
XII-16
2. Variasi 2
Diketahui data :
= 30
Putaran piringan (rpm) = 110
Tekanan pompa (bar) = 0.6
Volume container :
* Volume container 1 = 39 ml
* Volume container 2 = 42 ml
* Volume container 3 = 33 ml
* Volume container 4 = 36 ml
* Volume container 5 = 31 ml
Volume container rata-rata (m) = 36.2 ml
Luas container ( A ) = 41.833
Waktu ( t ) = 10 menit
Banyak pengamatan ( n ) = 5
Menghitung intensitas curah hujan
I =Q
x 600A x t
~ I cont 1 =39
x 600 = 55.937 mm/jam41.833 x 10
~ I cont 2 =42
x 600 = 60.240 mm/jam41.833 x 10
~ I cont 3 =33
x 600 = 47.331 mm/jam41.833 x 10
~ I cont 4 =36
x 600 = 51.634 mm/jam41.833 x 10
~ I cont 5 =31
x 600 = 44.463 mm/jam41.833 x 10
Menghitung Intensitas Rata-Rata
~ =Q
x 600A x t
=36.200
x 600 = 51.9212 mm/jam41.833 x 10
Bukaan piringan (o)
cm2
Irata-rata
XII-16
3. Variasi 3
Diketahui data :
= 30
Putaran piringan (rpm) = 120
Tekanan pompa (bar) = 0.6
Volume container :
* Volume container 1 = 47.5 ml
* Volume container 2 = 41 ml
* Volume container 3 = 31 ml
* Volume container 4 = 40 ml
* Volume container 5 = 29 ml
Volume container rata-rata (m) = 37.7 ml
Luas container ( A ) = 41.833
Waktu ( t ) = 10 menit
Banyak pengamatan ( n ) = 5
Menghitung intensitas curah hujan
I =Q
x 600A x t
~ I cont 1 =47.5
x 600 = 68.129 mm/jam41.833 x 10
~ I cont 2 =41
x 600 = 58.806 mm/jam41.833 x 10
~ I cont 3 =31
x 600 = 44.463 mm/jam41.833 x 10
~ I cont 4 =40
x 600 = 57.371 mm/jam41.833 x 10
~ I cont 5 =29
x 600 = 41.594 mm/jam41.833 x 10
Menghitung Intensitas Rata-Rata
~ =Q
x 600A x t
=37.700
x 600 = 54.0726 mm/jam41.833 x 10
Bukaan piringan (o)
cm2
Irata-rata
XII-16
4. Variasi 4
Diketahui data :
= 30
Putaran piringan (rpm) = 130
Tekanan pompa (bar) = 0.5
Volume container :
* Volume container 1 = 50 ml
* Volume container 2 = 22 ml
* Volume container 3 = 10.5 ml
* Volume container 4 = 38 ml
* Volume container 5 = 27 ml
Volume container rata-rata (m) = 29.5 ml
Luas container ( A ) = 41.833
Waktu ( t ) = 10 menit
Banyak pengamatan ( n ) = 5
Menghitung intensitas curah hujan
I =Q
x 600A x t
~ I cont 1 =50
x 600 = 71.7143 mm/jam41.833 x 10
~ I cont 2 =22
x 600 = 31.5543 mm/jam41.833 x 10
~ I cont 3 =10.5
x 600 = 15.0600 mm/jam41.833 x 10
~ I cont 4 =38
x 600 = 54.5029 mm/jam41.833 x 10
~ I cont 5 =27
x 600 = 38.7257 mm/jam41.833 x 10
Menghitung Intensitas Rata-Rata
~ =Q
x 600A x t
=29.500
x 600 = 42.3114 mm/jam41.833 x 10
Bukaan piringan (o)
cm2
Irata-rata
XII-16
5. Variasi 5
Diketahui data :
= 30
Putaran piringan (rpm) = 130
Tekanan pompa (bar) = 0.4
Volume container : =
* Volume container 1 = 46 ml
* Volume container 2 = 17.5 ml
* Volume container 3 = 15.5 ml
* Volume container 4 = 40.5 ml
* Volume container 5 = 27 ml
Volume container rata-rata (m) = 29.3 ml
Luas container ( A ) = 41.833
Waktu ( t ) = 10 menit
Banyak pengamatan ( n ) = 5
Menghitung intensitas curah hujan
I =Q
x 600A x t
~ I cont 1 =46
x 600 = 65.9772 mm/jam41.833 x 10
~ I cont 2 =17.5
x 600 = 25.1000 mm/jam41.833 x 10
~ I cont 3 =15.5
x 600 = 22.2314 mm/jam41.833 x 10
~ I cont 4 =40.5
x 600 = 58.0886 mm/jam41.833 x 10
~ I cont 5 =27
x 600 = 38.7257 mm/jam41.833 x 10
Menghitung Intensitas Rata-Rata
~ =Q
x 600A x t
=29.300
x 600 = 42.0246 mm/jam41.833 x 10
Bukaan piringan (o)
cm2
Irata-rata
XII-16
6. Variasi 6
Diketahui data :
= 30
Putaran piringan (rpm) = 130
Tekanan pompa (bar) = 0.3
Volume container : =
* Volume container 1 = 40 ml
* Volume container 2 = 33.5 ml
* Volume container 3 = 33 ml
* Volume container 4 = 43 ml
* Volume container 5 = 33 ml
Volume container rata-rata (m) = 36.5 ml
Luas container ( A ) = 41.833
Waktu ( t ) = 10 menit
Banyak pengamatan ( n ) = 5
Menghitung intensitas curah hujan
I =Q
x 600A x t
~ I cont 1 =40
x 600 = 57.3715 mm/jam41.833 x 10
~ I cont 2 =33.5
x 600 = 48.0486 mm/jam41.833 x 10
~ I cont 3 =33
x 600 = 47.3315 mm/jam41.833 x 10
~ I cont 4 =43
x 600 = 61.6743 mm/jam41.833 x 10
~ I cont 5 =33
x 600 = 47.3315 mm/jam41.833 x 10
Menghitung Intensitas Rata-Rata
~ =Q
x 600A x t
=36.500
x 600 = 52.3515 mm/jam41.833 x 10
Bukaan piringan (o)
cm2
Irata-rata
XII-16
12.6.2. Menghitung nilai keseragaman Cu
1. Variasi 1
Dik :
Bukaan piringan = 10 0
Putaran piringan = 120 rpm
Tekanan Pompa = 0.4 bar
Intensitas container :
I Container 1 = 63.109 mm/jam
I Container 2 = 61.674 mm/jam
I Container 3 = 54.503 mm/jam
I Container 4 = 53.069 mm/jam
I Container 5 = 38.726 mm/jam
= = 54.216 mm/jam5
Banyak pengamatan (n) = 5
Cu = 100 x 1 -m n
= I rata-rata-I cont1 + I rata-rata-I cont2 + I rata-rata-I cont3
I rata-rata-I cont4 + I rata-rata-I cont5
= 54.216 - 63.109 + 54.216 - 61.674 +
54.216 - 54.503 + 54.216 - 53.069 +
54.216 - 38.726
= -33.275
Cu = 100 x 1 --33.275
54.216 5
Cu = 112.275
Irata-rataI1 + I2 + I3 + I4 + I5
S lxl
S lxl
S lxl
S lxl
XII-16
2. Variasi 2
Dik :
Bukaan piringan = 10 0
Putaran piringan = 140 rpm
Tekanan Pompa = 0.4 bar
Intensitas container :
I Container 1 = 55.937 mm/jam
I Container 2 = 60.240 mm/jam
I Container 3 = 47.331 mm/jam
I Container 4 = 51.634 mm/jam
I Container 5 = 44.463 mm/jam
= = 51.921 mm/jam5
Banyak pengamatan (n) = 5
Cu = 100 x 1 -m n
= I rata-rata-I cont1 + I rata-rata-I cont2 + I rata-rata-I cont3
I rata-rata-I cont4 + I rata-rata-I cont5
= 51.921 - 55.937 + 51.921 - 60.240 +
51.921 - 47.331 + 51.921 - 51.634 +
51.921 - 44.463
= -24.670
Cu = 100 x 1 --24.670
51.921 5
Cu = 109.503
Irata-rataI1 + I2 + I3 + I4 + I5
S lxl
S lxl
S lxl
S lxl
XII-16
3. Variasi 3
Dik :
Bukaan piringan = 10 0
Putaran piringan = 140 rpm
Tekanan Pompa = 0.4 bar
Intensitas container :
I Container 1 = 68.129 mm/jam
I Container 2 = 58.806 mm/jam
I Container 3 = 44.463 mm/jam
I Container 4 = 57.371 mm/jam
I Container 5 = 41.594 mm/jam
= = 54.073 mm/jam5
Banyak pengamatan (n) = 5
Cu = 100 x 1 -m n
= I rata-rata-I cont1 + I rata-rata-I cont2 + I rata-rata-I cont3
I rata-rata-I cont4 + I rata-rata-I cont5
= 54.073 - 68.129 + 54.073 - 58.806 +
54.073 - 44.463 + 54.073 - 57.371 +
54.073 - 41.594
= -25.100
Cu = 100 x 1 --25.100
54.073 5
Cu = 109.284
Irata-rataI1 + I2 + I3 + I4 + I5
S lxl
S lxl
S lxl
S lxl
XII-16
4. Variasi 4
Dik :
Bukaan piringan = 10 0
Putaran piringan = 130 rpm
Tekanan Pompa = 0.3 bar
Intensitas container :
I Container 1 = 71.714 mm/jam
I Container 2 = 31.554 mm/jam
I Container 3 = 15.060 mm/jam
I Container 4 = 54.503 mm/jam
I Container 5 = 38.726 mm/jam
= = 42.311 mm/jam5
Banyak pengamatan (n) = 5
Cu = 100 x 1 -m n
= I rata-rata-I cont1 + I rata-rata-I cont2 + I rata-rata-I cont3
I rata-rata-I cont4 + I rata-rata-I cont5
= 42.311 - 71.714 + 42.311 - 31.554 +
42.311 - 15.060 + 42.311 - 54.503 +
42.311 - 38.726
= -37.291
Cu = 100 x 1 --37.291
42.311 5
Cu = 117.6271
Irata-rataI1 + I2 + I3 + I4 + I5
S lxl
S lxl
S lxl
S lxl
XII-16
5. Variasi 5
Dik :
Bukaan piringan = 10 0
Putaran piringan = 130 rpm
Tekanan Pompa = 0.4 bar
Intensitas container :
I Container 1 = 65.977 mm/jam
I Container 2 = 25.100 mm/jam
I Container 3 = 22.231 mm/jam
I Container 4 = 58.089 mm/jam
I Container 5 = 38.726 mm/jam
= = 42.025 mm/jam5
Banyak pengamatan (n) = 5
Cu = 100 x 1 -m n
= I rata-rata-I cont1 + I rata-rata-I cont2 + I rata-rata-I cont3
I rata-rata-I cont4 + I rata-rata-I cont5
= 42.025 - 65.977 + 42.025 - 25.100 +
42.025 - 22.231 + 42.025 - 58.089 +
42.025 - 38.726
= 34.710
Cu = 100 x 1 -34.710
42.025 5
Cu = 106.689
Irata-rataI1 + I2 + I3 + I4 + I5
S lxl
S lxl
S lxl
S lxl
XII-16
6. Variasi 6
Dik :
Bukaan piringan = 10 0
Putaran piringan = 150 rpm
Tekanan Pompa = 0.5 bar
Intensitas container :
I Container 1 = 57.371 mm/jam
I Container 2 = 48.049 mm/jam
I Container 3 = 47.331 mm/jam
I Container 4 = 61.674 mm/jam
I Container 5 = 47.331 mm/jam
= = 52.351 mm/jam5
Banyak pengamatan (n) = 5
Cu = 100 x 1 -m n
= I rata-rata-I cont1 + I rata-rata-I cont2 + I rata-rata-I cont3
I rata-rata-I cont4 + I rata-rata-I cont5
= 52.351 - 57.371 + 52.351 - 48.049 +
52.351 - 47.331 + 52.351 - 61.674 +
52.351 - 47.331
= -1.434 mm/jam
Cu = 100 x 1 --1.434
52.351 5
Cu = 100.548
Irata-rataI1 + I2 + I3 + I4 + I5
S lxl
S lxl
S lxl
S lxl
XII - 29
12.6.3 Menghitung Analisis Frekuensi Hujan
1. Metode rata - rata Aritmatik
Digunakan Rumus :
d =+ + + ….. +
n
dengan :
d = tinggi curah hujan rata- rata
= tinggi curah hujan pada pos penakar 1, 2,…n
n = banyaknya pos penakar
Variasi 1
Diketahui data :
* = 44.00 ml
* = 43.00 ml
* = 38.00 ml
* = 37.00 ml
* = 27.00 ml
d =44.00 + 43.00 + 38.00 + 37.00 + 27.00
5
d = 37.80 ml
Variasi 2
Diketahui data :
* = 39.00 ml
* = 42.00 ml
* = 33.00 ml
* = 36.00 ml
* = 31.00 ml
d =39.00 + 42.00 + 33.00 + 36.00 + 31.00
5
d = 36.20 ml
Variasi 3
Diketahui data :
* = 47.50 ml
* = 41.00 ml
* = 31.00 ml
* = 40.00 ml
* = 29.00 ml
d =47.50 + 41.00 + 31.00 + 40.00 + 29.00
5
d = 37.70 ml
d1 d2 d3 dn
d1, d2,…dn
Curah hujan container 1 ( d1 )
Curah hujan container 2 ( d2 )
Curah hujan container 3 ( d3 )
Curah hujan container 4 ( d4 )
Curah hujan container 5 ( d5 )
Curah hujan container 1 ( d1 )
Curah hujan container 2 ( d2 )
Curah hujan container 3 ( d3 )
Curah hujan container 4 ( d4 )
Curah hujan container 5 ( d5 )
Curah hujan container 1 ( d1 )
Curah hujan container 2 ( d2 )
Curah hujan container 3 ( d3 )
Curah hujan container 4 ( d4 )
Curah hujan container 5 ( d5 )
XII - 29
Variasi 4
Diketahui data :
* = 50.00 ml
* = 22.00 ml
* = 10.50 ml
* = 38.00 ml
* = 27.00 ml
d =50.00 + 22.00 + 10.50 + 38.00 + 27.00
5
d = 29.50 ml
Variasi 5
Diketahui data :
* = 46.00 ml
* = 17.50 ml
* = 15.50 ml
* = 40.50 ml
* = 27.00 ml
d =46.00 + 17.50 + 15.50 + 40.50 + 27.00
5
d = 29.30 ml
Variasi 6
Diketahui data :
* = 40.00 ml
* = 33.50 ml
* = 33.00 ml
* = 43.00 ml
* = 33.00 ml
d =40.00 + 33.50 + 33.00 + 43.00 + 33.00
5
d = 36.50 ml
Curah hujan container 1 ( d1 )
Curah hujan container 2 ( d2 )
Curah hujan container 3 ( d3 )
Curah hujan container 4 ( d4 )
Curah hujan container 5 ( d5 )
Curah hujan container 1 ( d1 )
Curah hujan container 2 ( d2 )
Curah hujan container 3 ( d3 )
Curah hujan container 4 ( d4 )
Curah hujan container 5 ( d5 )
Curah hujan container 1 ( d1 )
Curah hujan container 2 ( d2 )
Curah hujan container 3 ( d3 )
Curah hujan container 4 ( d4 )
Curah hujan container 5 ( d5 )
XII - 29
2. Metode Poligon Thiessen
Digunakan Rumus :
d =+ + + ….. +
dengan :
A = luas areal
d = tinggi curah hujan rata- rata areal
= tinggi curah hujan pada pos penakar 1, 2, 3, …n
= luas daerah pengaruh pos 1, 2, 3, ….n
Variasi 1
Diketahui data :
* = 44.0 ml 41.833
* = 43.00 ml 41.833
* = 38.0 ml 41.833
* = 37.0 ml 41.833
* = 27.0 ml 41.833
d =1840.637 + 1798.804 + 1589.641 + 1547.808 + 1129.482
209.163
d = 37.80 ml
Variasi 2
Diketahui data :
* = 39.00 ml 41.833
* = 42.00 ml 41.833
* = 33.0 ml 41.833
* = 36.0 ml 41.833
* = 31.0 ml 41.833
d =1631.473 + 1756.971 + 1380.477 + 1505.975 + 1296.812
209.163
d = 36.20 ml
Variasi 3
Diketahui data :
* = 47.5 ml 41.833
* = 41.00 ml 41.833
* = 31.0 ml 41.833
* = 40.0 ml 41.833
* = 29.0 ml 41.833
d =1987.051 + 1715.139 1296.812 1296.812 + 1673.306 + 1213.147
209.163
d = 37.70 ml
A1d1 A2d2 A3d3 Andn
A1 + A2 + A3 + ….. + An
d1, d2, d3…dn
A1, A2, A3…An
Curah hujan container 1 ( d1 ) Luas Cont. 1 (A1) = cm2
Curah hujan container 2 ( d2 ) Luas Cont. 2 (A2) = cm2
Curah hujan container 3 ( d3 ) Luas Cont. 3 (A3) = cm2
Curah hujan container 4 ( d4 ) Luas Cont. 4 (A4) = cm2
Curah hujan container 5 ( d5 ) Luas Cont. 5 (A5) = cm2
Curah hujan container 1 ( d1 ) Luas Cont. 1 (A1) = cm2
Curah hujan container 2 ( d2 ) Luas Cont. 2 (A2) = cm2
Curah hujan container 3 ( d3 ) Luas Cont. 3 (A3) = cm2
Curah hujan container 4 ( d4 ) Luas Cont. 4 (A4) = cm2
Curah hujan container 5 ( d5 ) Luas Cont. 5 (A5) = cm2
Curah hujan container 1 ( d1 ) Luas Cont. 1 (A1) = cm2
Curah hujan container 2 ( d2 ) Luas Cont. 2 (A2) = cm2
Curah hujan container 3 ( d3 ) Luas Cont. 3 (A3) = cm2
Curah hujan container 4 ( d4 ) Luas Cont. 4 (A4) = cm2
Curah hujan container 5 ( d5 ) Luas Cont. 5 (A5) = cm2
XII - 29
Variasi 4
Diketahui data :
* = 50.00 ml 41.833
* = 22.0 ml 41.833
* = 10.5 ml 41.833
* = 38.0 ml 41.833
* = 27.0 ml 41.833
d =1987.051 + 920.318 + 439.243 + 1589.641 + 1129.482
209.163
d = 29.00 ml
Variasi 5
Diketahui data :
* = 46.0 ml 41.833
* = 17.5 ml 41.833
* = 15.5 ml 41.833
* = 40.5 ml 41.833
* = 27.0 ml 41.833
d =1924.302 + 732.071 + 648.406 + 1694.222 + 1129.482
209.163
d = 29.30 ml
Variasi 6
Diketahui data :
* = 40.0 ml 41.833
* = 33.5 ml 41.833
* = 33.0 ml 41.833
* = 43.0 ml 41.833
* = 33.0 ml 41.833
d =1673.306 + 1401.394 + 1380.477 + 1798.804 + 1380.477
209.163
d = 36.50 ml
Curah hujan container 1 ( d1 ) Luas Cont. 1 (A1) = cm2
Curah hujan container 2 ( d2 ) Luas Cont. 2 (A2) = cm2
Curah hujan container 3 ( d3 ) Luas Cont. 3 (A3) = cm2
Curah hujan container 4 ( d4 ) Luas Cont. 4 (A4) = cm2
Curah hujan container 5 ( d5 ) Luas Cont. 5 (A5) = cm2
Curah hujan container 1 ( d1 ) Luas Cont. 1 (A1) = cm2
Curah hujan container 2 ( d2 ) Luas Cont. 2 (A2) = cm2
Curah hujan container 3 ( d3 ) Luas Cont. 3 (A3) = cm2
Curah hujan container 4 ( d4 ) Luas Cont. 4 (A4) = cm2
Curah hujan container 5 ( d5 ) Luas Cont. 5 (A5) = cm2
Curah hujan container 1 ( d1 ) Luas Cont. 1 (A1) = cm2
Curah hujan container 2 ( d2 ) Luas Cont. 2 (A2) = cm2
Curah hujan container 3 ( d3 ) Luas Cont. 3 (A3) = cm2
Curah hujan container 4 ( d4 ) Luas Cont. 4 (A4) = cm2
Curah hujan container 5 ( d5 ) Luas Cont. 5 (A5) = cm2
XII - 29
3. Metode Log-Person
Variasi 1
Diketahui data :
Cont. Xi Log (Xi) (Log Xi - Log Xi)
(1) (2) (3) (4) (5) (6)
1 44.0 1.643 1.643 2.701 4.439
2 43.00 1.633 1.633 2.668 4.358
3 38.0 1.580 1.580 2.496 3.943
4 37.0 1.568 1.568 2.459 3.857
5 27.0 1.431 1.431 2.049 2.933
189.00 7.856 7.856 12.373 19.529
Hitung nilai log Xi rata-rata :
=7.856
= 1.57135
Hitung nilai deviasi standar log Xi :
=12.37293
= 1.758765 - 1
Hitung nilai koefisien kemencengan :
CS =5 . ( 19.52920 )
= 1.49574 . 3 . ( 1.75876
Dari persamaan :
Log X = Log X + k. ( S Log X )
Log X = 1.5713 + k. ( 1.75876 )
Berdasarkan nilai CS = 1.4957 , maka nilai k = -0.254
Sehingga :
Log X = 1.5713 + ( -0.254 x 1.75876 )
Log X = 1.125
X = 13.321 mm
Variasi 2
Diketahui data :
Cont. Xi Log (Xi) (Log Xi - Log Xi)
(1) (2) (3) (4) (5) (6)
1 39.00 1.591 1.591 2.531 4.028
2 42.0 1.623 1.623 2.635 4.277
3 33.0 1.519 1.519 2.306 3.502
4 36.0 1.556 1.556 2.422 3.769
5 31.0 1.491 1.491 2.224 3.317
181.0 7.780 7.780 12.119 18.893
(Log Xi - Log Xi)2 (Log Xi - Log Xi)3
)3
(Log Xi - Log Xi)2 (Log Xi - Log Xi)3
S log X = √∑ ( log x - log x )2
n - 1
CS = n ∑ ( log x - log x )3
(n - 1 )(n - 2 ) ( S log X )3
log x i = ∑ log x i
nlog x i =
∑ log x i
n
XII - 29
Hitung nilai log Xi rata-rata :
=7.780
= 1.55615
Hitung nilai deviasi standar log Xi :
=12.11855
= 1.740595 - 1
Hitung nilai koefisien kemencengan :
CS =5 . ( 18.89295 )
= 1.49284 . 3 . ( 1.74059
Dari persamaan :
Log X = Log X + k. ( S Log X )
Log X = 1.5561 + k. ( 1.74059 )
Berdasarkan nilai CS = 1.4928 , maka nilai k = -0.254
Sehingga :
Log X = 1.5561 + ( -0.254 x 1.74059 )
Log X = 1.114
X = 13.001 mm
)3
log x i = ∑ log x i
n
S log X = √∑ ( log x - log x )2
n - 1
CS = n ∑ ( log x - log x )3
(n - 1 )(n - 2) ( S log X )3
XII - 29
Variasi 3
Diketahui data :
Cont. Xi Log (Xi) (Log Xi - Log Xi)
(1) (2) (3) (4) (5) (6)
1 47.5 1.677 1.677 2.811 4.714
2 41.00 1.613 1.613 2.601 4.195
3 31.0 1.491 1.491 2.224 3.317
4 40.0 1.602 1.602 2.567 4.112
5 29.0 1.462 1.462 2.139 3.127
188.50 7.845 7.845 12.342 19.465
Hitung nilai log Xi rata-rata :
=7.845
= 1.56915
Hitung nilai deviasi standar log Xi :
=12.34174
= 1.756545 - 1
Hitung nilai koefisien kemencengan :
CS =5 . ( 19.46502 )
= 1.49654 . 3 . ( 1.75654
Dari persamaan :
Log X = Log X + k. ( S Log X )
Log X = 1.5691 + k. ( 1.75654 )
Berdasarkan nilai CS = 1.4965 , maka nilai k = -0.254
Sehingga :
Log X = 1.5691 + ( -0.254 x 1.75654 )
Log X = 1.123
X = 13.271 mm
Variasi 4
Diketahui data :
Cont. Xi Log (Xi) (Log Xi - Log Xi)
(1) (2) (3) (4) (5) (6)
1 50.00 1.699 1.699 2.886 4.904
2 22.0 1.342 1.342 1.802 2.419
3 10.5 1.021 1.021 1.043 1.065
4 38.0 1.580 1.580 2.496 3.943
5 27.0 1.431 1.431 2.049 2.933
147.50 7.074 7.074 10.276 15.263
(Log Xi - Log Xi)2 (Log Xi - Log Xi)3
)3
(Log Xi - Log Xi)2 (Log Xi - Log Xi)3
S log X = √∑ ( log x - log x )2
n - 1
CS = n ∑ ( log x - log x )3
(n - 1 )(n - 2 ) ( S log X )3
log x i = ∑ log x i
n
XII - 29
Hitung nilai log Xi rata-rata :
=7.074
= 1.41475
Hitung nilai deviasi standar log Xi :
=10.27594
= 1.602815 - 1
Hitung nilai koefisien kemencengan :
CS =5 . ( 15.26345 )
= 1.54454 . 3 . ( 1.60281
Dari persamaan :
Log X = Log X + k. ( S Log X )
Log X = 1.4147 + k. ( 1.60281 )
Berdasarkan nilai CS = 1.5445 , maka nilai k = -0.254
Sehingga :
Log X = 1.4147 + ( -0.254 x 1.60281 )
Log X = 1.008
X = 10.177 mm
)3
S log X = √∑ ( log x - log x )2
n - 1
CS = n ∑ ( log x - log x )3
(n - 1 )(n - 2 ) ( S log X )3
log x i = ∑ log x i
n
XII - 29
Variasi 5
Diketahui data :
Cont. Xi Log (Xi) (Log Xi - Log Xi)
(1) (2) (3) (4) (5) (6)
1 46.00 1.663 1.663 2.765 4.597
2 17.5 1.243 1.243 1.545 1.921
3 15.5 1.190 1.190 1.417 1.687
4 40.5 1.607 1.607 2.584 4.154
5 27.0 1.431 1.431 2.049 2.933
146.50 7.135 7.135 10.360 15.290
Hitung nilai log Xi rata-rata :
=7.135
= 1.42705
Hitung nilai deviasi standar log Xi :
=10.35951
= 1.609315 - 1
Hitung nilai koefisien kemencengan :
CS =5 . ( 15.29048 )
= 1.52864 . 3 . ( 1.60931
Dari persamaan :
Log X = Log X + k. ( S Log X )
Log X = 1.4270 + k. ( 1.60931 )
Berdasarkan nilai CS = 1.5286 , maka nilai k = -0.254
Sehingga :
Log X = 1.4270 + ( -0.254 x 1.60931 )
Log X = 1.018
X = 10.429 mm
Variasi 6
Diketahui data :
Cont. Xi Log (Xi) (Log Xi - Log Xi)
(1) (2) (3) (4) (5) (6)
1 40.0 1.602 1.602 2.567 4.112
2 33.5 1.525 1.525 2.326 3.547
3 33.0 1.519 1.519 2.306 3.502
4 43.0 1.633 1.633 2.668 4.358
5 33.0 1.519 1.519 2.306 3.502
182.5 7.798 7.798 12.172 19.020
(Log Xi - Log Xi)2 (Log Xi - Log Xi)3
)3
(Log Xi - Log Xi)2 (Log Xi - Log Xi)3
S log X = √∑ ( log x - log x )2
n - 1
CS = n ∑ ( log x - log x )3
(n - 1 )(n - 2 ) ( S log X )3
log x i = ∑ log x i
n
XII - 29
Hitung nilai log Xi rata-rata :
=7.798
= 1.55955
Hitung nilai deviasi standar log Xi :
=12.17235
= 1.744445 - 1
Hitung nilai koefisien kemencengan :
CS =5 . ( 19.02022 )
= 1.49294 . 3 . ( 1.74444
Dari persamaan :
Log X = Log X + k. ( S Log X )
Log X = 1.5595 + k. ( 1.74444 )
Berdasarkan nilai CS = 1.4929 , maka nilai k = -0.254
Sehingga :
Log X = 1.5595 + ( -0.254 x 1.74444 )
Log X = 1.116
X = 13.075 mm
)3
S log X = √∑ ( log x - log x )2
n - 1
CS = n ∑ ( log x - log x )3
(n - 1 )(n - 2 ) ( S log X )3
log x i = ∑ log x i
n
Laboratorium Hidrolika
Jurusan Sipil Fakultas Teknik
Universitas Hasanuddin
Tabel Perhitungan Rainfall Simulator
Hasil Perhitungan Rainfall Simulator
Variasi
Volume Container (Q) Luas Cont. Waktu IntensitasKeseragaman
V Cont. 1 V Cont. 2 V Cont. 3 V Cont. 4 V Cont. 5 A t I
ml ml ml ml ml ml menit mm/jam Cu
1
30
44 43 38 37 27 37.8 41.833 10 54.216 112.275Putaran piringan (rpm) 100
Tekanan pompa (bar) 0.6
2
30
39 42 33 36 31 36.2 41.833 10 51.921 109.503Putaran piringan (rpm) 110
Tekanan pompa (bar) 0.6
3
30
47.5 41 31 40 29 37.7 41.833 10 54.073 109.284Putaran piringan (rpm) 120
Tekanan pompa (bar) 0.6
4
30
50 22 10.5 38 27 29.5 41.833 10 42.311 117.627Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.5
5
30
46 17.5 15.5 40.5 27 29.3 41.833 10 42.025 106.689Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.4
6
30
40 33.5 33 43 33 36.5 41.833 10 52.351 100.548Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.3
CataCat : D = 7.3 cm
V rata-rata
cm2
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
t = 10 menit
Laboratorium Hidrolika
Jurusan Sipil Fakultas Teknik
Universitas Hasanuddin
12.6 Tabel Perhitungan Rainfall Simulator
Hasil Perhitungan Rainfall Simulator
Variasi
Volume Container (Q) Luas Cont. Waktu IntensitasKeseragaman
V Cont. 1 V Cont. 2 V Cont. 3 V Cont. 4 V Cont. 5 A t I
ml ml ml ml ml ml menit mm/jam Cu
1
30
44 43 38 37 27 37.8 41.833 10 54.216 112.275Putaran piringan (rpm) 100
Tekanan pompa (bar) 0.6
2
30
39 42 33 36 31 36.2 41.833 10 51.921 109.503Putaran piringan (rpm) 110
Tekanan pompa (bar) 0.6
3
30
47.5 41 31 40 29 37.7 41.833 10 54.073 109.284Putaran piringan (rpm) 120
Tekanan pompa (bar) 0.6
4
30
50 22 10.5 38 27 29.5 41.833 10 42.311 117.627Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.5
5
30
46 17.5 15.5 40.5 27 29.3 41.833 10 42.025 106.689Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.4
6
30
40 33.5 33 43 33 36.5 41.833 10 52.351 100.548Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.3
Catatan : D = 7.3 cm
V rata-rata
cm2
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
XII - 30
Laboratorium Hidrolika
Jurusan Sipil Fakultas Teknik
Universitas Hasanuddin
12.6.4. Tabel Perhitungan Rainfall Simulator
Tabel Hasil Perhitungan Rainfall Simulator
Variasi
Volume Container (Q) Luas Cont. Waktu Intensitas (I)m=Slxl Keseragaman
V Cont. 1 V Cont. 2 V Cont. 3 V Cont. 4 V Cont. 5 A t I Cont. 1 I Cont. 2 I Cont. 3 I Cont. 4 I Cont. 5
ml ml ml ml ml ml menit mm/jam mm/jam mm/jam mm/jam mm/jam mm/jam mm/jam Cu
1
30
44 43 38 37 27 37.8 41.833 10 63.109 61.674 54.503 53.069 38.726 54.216 -33.28 112.275Putaran piringan (rpm) 100
Tekanan pompa (bar) 0.6
2
30
39 42 33 36 31 36.2 41.833 10 55.937 60.240 47.331 51.634 44.463 51.921 -24.67 109.503Putaran piringan (rpm) 110
Tekanan pompa (bar) 0.6
3
30
47.5 41 31 40 29 37.7 41.833 10 68.129 58.806 44.463 57.371 41.594 54.073 -25.10 109.284Putaran piringan (rpm) 120
Tekanan pompa (bar) 0.6
4
30
50 22 10.5 38 27 29.5 41.833 10 71.714 31.554 15.060 54.503 38.726 42.311 -37.29 117.627Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.5
5
30
46 17.5 15.5 40.5 27 29.3 41.833 10 65.977 25.100 22.231 58.089 38.726 42.025 -14.06 106.689Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.4
6
30
40 33.5 33 43 33 36.5 41.833 10 57.371 48.049 47.331 61.674 47.331 52.351 -1.43 100.548Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.3
V rata-rata I rata-rata
cm2
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Laboratorium Hidrolika
Jurusan Sipil Fakultas Teknik
Universitas Hasanuddin
12.6.6. Perbandingan Intensitas Curah Hujan
Variasi
Volume Container (Q) Metode
V Cont. 1 V Cont. 2 V Cont. 3 V Cont. 4 V Cont. 5 Rata-rata Aritmatik Poligon Thiessen Log Pearson
( ml ) ( ml ) ( ml ) ( ml ) ( ml ) ( ml ) ( ml ) ( ml ) ( mm)
1
30
44 43 38 37 27 37.8 37.800 37.800 13.321Putaran piringan (rpm) 100
Tekanan pompa (bar) 0.6
2
30
39 42 33 36 31 36.2 36.200 36.200 13.001Putaran piringan (rpm) 110
Tekanan pompa (bar) 0.6
3
30
47.5 41 31 40 29 37.7 37.700 37.700 13.271Putaran piringan (rpm) 120
Tekanan pompa (bar) 0.6
4
30
50 22 10.5 38 27 29.5 29.500 29.000 10.177Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.5
5
30
46 17.5 15.5 40.5 27 29.3 29.300 29.300 10.429Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.4
6
30
40 33.5 33 43 33 36.5 36.500 36.500 13.075Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.3
Catatan : D = 7.3 cm
V rata-rata
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Laboratorium Hidrolika
Jurusan Sipil Fakultas Teknik
Universitas Hasanuddin
12.6.5. Tabel Perhitungan Frekuensi Curah Hujan
Tabel Hasil Perhitungan Analisis Frekuensi Curah Hajan
Variasi
Metode
Rata-rata Aritmatik Poligon Thiessen Log Pearson
( ml ) ( ml ) ( mm)
1
30
37.800 37.800 13.321Putaran piringan (rpm) 100
Tekanan pompa (bar) 0.6
2
30
36.200 36.200 13.001Putaran piringan (rpm) 110
Tekanan pompa (bar) 0.6
3
30
37.700 37.700 13.271Putaran piringan (rpm) 120
Tekanan pompa (bar) 0.6
4
30
29.500 29.000 10.177Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.5
5
30
29.300 29.300 10.429Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.4
6
30
36.500 36.500 13.075Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.3
Catatan : D = 7.3 cm
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Laboratorium Hidrolika
Jurusan Sipil Fakultas Teknik
Universitas Hasanuddin
12.6.7. Tabel Hasil Rekapitulasi Perhitungan Rainfall Simulator
Variasi
Volume Container (Q) Luas Cont. Waktu Intensitas (I)m=Slxl Keseragaman
Metode
V Cont. 1 V Cont. 2 V Cont. 3 V Cont. 4 V Cont. 5 A t I Cont. 1 I Cont. 2 I Cont. 3 I Cont. 4 I Cont. 5 Rata-rata Aritmatik Poligon Thiessen Log Pearson
ml ml ml ml ml ml menit mm/jam mm/jam mm/jam mm/jam mm/jam mm/jam mm/jam Cu ( ml ) ( ml ) ( mm)
1
30
5.00 7.25 30.00 47.00 51.50 28.15 41.833 10 7.171 10.399 43.029 67.411 73.866 40.375 121.05 40.036 28.150 28.150 7.947Putaran piringan (rpm) 100
Tekanan pompa (bar) 0.6
2
30
7.54 9.04 42.00 49.50 52.00 32.016 41.833 10 10.815 12.966 60.240 70.997 74.583 45.920 136.12 40.715 32.016 32.016 9.315Putaran piringan (rpm) 110
Tekanan pompa (bar) 0.6
3
30
8.00 10.75 44.50 51.50 53.50 33.65 41.833 10 11.474 15.419 63.826 73.866 76.734 48.264 110.80 54.086 33.650 33.650 9.836Putaran piringan (rpm) 120
Tekanan pompa (bar) 0.6
4
30
5.25 7.10 38.80 46.40 51.90 29.89 41.833 10 7.530 10.183 55.650 66.551 74.439 42.871 13.06 36.527 29.890 30.440 8.265Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.5
5
30
7.25 8.90 40.50 48.60 51.50 31.35 41.833 10 10.399 12.765 58.089 69.706 73.866 44.965 133.53 40.606 31.350 31.350 9.152Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.4
6
30
8.50 11.00 43.30 50.60 53.20 33.32 41.833 10 12.191 15.777 62.105 72.575 76.304 47.790 135.22 43.409 33.320 33.320 9.903Putaran piringan (rpm) 130
Tekanan pompa (bar) 0.3
V rata-rata I rata-rata
cm2
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
XII - 35
TABEL PERHITUNGAN RAINFALL SIMULATOR
VariasiVolume container (Q) Luas Cont. Waktu Intensitas m
keseragamanV cont1V cont2V cont3V cont4V cont5V rata-rata A t I cont 1 I cont 2 I cont 3 I cont 4 I cont 5 S lxlml ml ml ml ml ml menit mm/jam mm/jam mm/jam mm/jam mm/jam mm/jam mm/jam Cu
130
44 43 38 37 27 37.8 41.833 10 63.109 61.674 54.503 53.069 38.726 54.216 -32.70 51.242Putaran piringan (rpm) 100Tekanan pompa (bar) 0.6
230
39 42 33 36 31 36.2 41.833 10 55.937 60.240 47.331 51.634 44.463 51.921 -24.67 109.503Putaran piringan (rpm) 110Tekanan pompa (bar) 0.6
330
47.5 41 31 40 29 37.7 41.833 10 68.129 58.806 44.463 57.371 41.594 54.073 -37.58 69.067Putaran piringan (rpm) 120Tekanan pompa (bar) 0.6
430
50 22 10.5 38 27 29.5 41.833 10 71.714 31.554 15.060 54.503 38.726 42.311 -37.29 117.627Putaran piringan (rpm) 130Tekanan pompa (bar) 0.5
530
46 17.5 15.5 40.5 27 29.3 41.833 10 65.977 25.100 22.231 58.089 38.726 42.025 -14.06 106.689Putaran piringan (rpm) 130Tekanan pompa (bar) 0.4
630
40 33.5 33 43 33 36.5 41.833 10 57.371 48.049 47.331 61.674 47.331 52.351 -1.43 100.548Putaran piringan (rpm) 130Tekanan pompa (bar) 0.3
I rata-rata
cm2
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
Bukaan piringan (o)
LABORATORIUM HIDROLIKAJURUSAN SIPILFAKULTAS TEKNIK UNIVERSITAS HASANUDDIN
XII - 35
Laboratorium HidrolikaJurusan Sipil Fakultas TeknikUniversitas Hasanuddin
12.6.8. Grafik Intensitas Curah Hujan
10 10 10 10 10 10
Putaran Piringan (rpm) 100 110 120 130 130 130
Tekanan Pompa (bar) 0.6 0.6 0.6 0.5 0.4 0.3
Intensitas (mm/jam) 54.216 51.921 54.073 42.311 42.025 52.351
Bukaan Piringan (o)30
35
40
45
50
55
60
65Histogram Intensitas Curah Hujan
Inte
nsit
as (
I),
mm
/jam
XII - 35
Laboratorium HidrolikaJurusan Sipil Fakultas TeknikUniversitas Hasanuddin
12.6.9. Grafik Keseragaman Curah Hujan
10 10 10 10 10 10
Putaran Piringan (rpm) 100 110 120 130 130 130
Tekanan Pompa (bar) 0.6 0.6 0.6 0.5 0.4 0.3
Intensitas (mm/jam) 51.242 109.503 69.067 117.627 106.689 100.548
Bukaan Piringan (o)30
35
40
45
50
55
60
65Histogram Intensitas Curah Hujan
Inte
nsit
as (
I),
mm
/jam
30
35
40
45
50
55
60
65
70Histogram Keseragaman Curah Hujan
Kesera
gam
an
(C
u)
t Intensitas Curah Hujan ( menit) 1 2 3 4 5
10 63.1086 55.9372 68.1286 71.7143 65.977220 61.6743 60.2400 58.8057 31.5543 25.100030 54.5029 47.3315 44.4629 15.0600 22.231440 53.0686 51.6343 57.3715 54.5029 58.088650 38.7257 44.4629 41.5943 38.7257 38.7257
Rata-rata0 6 0
10 63.1086 55.9372 68.1286 71.7143 65.9772 57.37146 54.2160320 61.6743 60.2400 58.8057 31.5543 25.1000 48.04859 51.9211730 54.5029 47.3315 44.4629 15.0600 22.2314 47.33145 54.072640 53.0686 51.6343 57.3715 54.5029 58.0886 61.67431 42.3114550 38.7257 44.4629 41.5943 38.7257 38.7257 47.33145 42.0245960 52.35145
Dbt rata2 Vrata-rata
10 37.8000 37.8010 36.2000 36.2010 37.7000 37.7010 29.5000 29.5010 29.3000 29.3010 36.5000 36.50
Laboratorium HidrolikaJurusan Sipil Fakultas TeknikUniversitas Hasanuddin
12.6.11. Grafik Hytograph Curah Hujan
0 1 2 3 4 5 6 7 8 9 10 1128.00
29.00
30.00
31.00
32.00
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00
Hyetograph Debit Curah Hujan
Waktu ( t )
Deb
it (
Q )
Laboratorium HidrolikaJurusan Sipil Fakultas TeknikUniversitas Hasanuddin
12.6.12. Grafik Hubungan Intensitas rata-rata dengan Debit Curah Hujan rata-rata
0 1 2 3 4 5 6 7 8 9 10 1128.00
29.00
30.00
31.00
32.00
33.00
34.00
35.00
Ploter Hyeto-Lengkung
Waktu ( t )
Debi
t ( Q
)
Laboratorium HidrolikaJurusan Sipil Fakultas TeknikUniversitas Hasanuddin
12.6.11. Grafik Hubungan Intensitas rata-rata dengan Debit Curah Hujan rata-rata
0 1 2 3 4 5 6 7 8 9 10 1125.00
26.00
27.00
28.00
29.00
30.00
31.00
32.00
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00Ploter Hyeto-Lengkung
Debit Curah Hujan
Waktu ( t )
Debi
t ( Q
)
Debit rata-rata
Laboratorium HidrolikaJurusan Sipil Fakultas TeknikUniversitas Hasanuddin
12.6.10. Grafik Hubungan Intensitas dengan Debit Curah Hujan rata-rata
0 1 2 3 4 5 6 7 8 9 10 1125.00
26.00
27.00
28.00
29.00
30.00
31.00
32.00
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00
Lengkung Curah Hujan Tiap-tiap Kontainer
Debit Curah HujanWaktu ( t )
Debi
t ( Q
)
Variasi 1 Variasi 2 Variasi 3 Variasi 4 Variasi 5 Variasi 6
Inte
nsi
tas
Cu
rah
Hu
jan
Co
nta
ine
r (
I )
12.7. Kesimpulan dan Saran
12.7.1 Kesimpulan
Berdasarkan hasil pengamatan, maka dapat disimpulkan :1. Intensitas curah hujan dan keseragamannya pada setiap kontainer
untuk setiap variasi berbeda - beda yaitu :a. Untuk variasi 1 diperoleh :
Intensitas curah hujan = 54.216 mm/jamKeseragaman ( Cu ) = 112.275
b. Untuk variasi 2, diperoleh :Intensitas curah hujan = 51.921 mm/jamKeseragaman ( Cu ) = 109.503
c. Untuk variasi 3, diperoleh :Intensitas curah hujan = 54.073 mm/jamKeseragaman ( Cu ) = 109.284
d. Untuk variasi 4, diperoleh :Intensitas curah hujan = 42.311 mm/jamKeseragaman ( Cu ) = 117.627
e. Untuk variasi 5, diperoleh :Intensitas curah hujan = 42.025 mm/jamKeseragaman ( Cu ) = 106.689
f. Untuk variasi 6, diperoleh : Intensitas curah hujan = 52.351 mm/jamKeseragaman ( Cu ) = 100.548
- Dari hasil di atas menunjukkan bahwa intensitas curah hujan terendah itu ada padavariasi 1 = 43.889 mm/jam dan intensitas curah hujan tertinggi ada padavariasi 3 = 53.786 mm/jam.
- Dari hasil di atas menunjukkan bahwa keseragaman terendah itu ada padavariasi 1 = 51.242 dan keseragaman tertinggi ada pada variasi 6 = 59.235
2. Frekuensi hujan pada setiap kontainer untuk setiap variasi berbeda - beda dimanadari hasil pengamatan diperoleh nilai frekuensi terendah ada pada Variasi 1 dan frekuensi hujan tertinggi ada pada Variasi 3 hal tersebut dipengaruhi oleh besarnya putaran piringan tiap Variasi yang ada.
3. Untuk hasil keseluruhan analisis frekuensi curah hujan dapat disimpulkan yaitu :- Data ini menunjukkan bahwa analisis frekuensi curah hujan terendah itu ada pada
variasi 1 = 7.947 mm dari metode Log Pearson dan intensitas curah hujantertinggi berada di variasi 3 = 33.650 dari metode Rata-rata Aritmatik dan Poligon Thiessen
4. Dari hasil analisis frekuensi hujan metode yang cocok digunakan dalam menentukanfrekuensi hujan adalah metode Poligon Thiessen dikarenakan frekuensi yang dihasilkan akurat dan cukup tinggi. Dan Metode ini umum digunakan untuk menghitungfrekuensi hujan yang terjadi pada suatu wilayah.
5. Besarnya nilai intensitas hujan yang diperoleh berbanding terbalik dengan jumlah putaranpiringan pada alat Rainfall Simulator.
6. Semakin tinggi tekanan pompa yang diberikan, maka nilai intensitas hujan yang diperolehsemakin besar pula.
12.7.2 Saran1. Percobaan sebaiknya dilakukan dengan menggunakan 2 alat yaitu Rainfall baru
dan Rainfall lama ini dimaksudkan untuk membandingkan hasil pengamatan.
2. Sebaiknya praktikan lebih teliti dalam mengatur penomoran kontainer agar tidak terjadikesalahan sehingga data yang diperoleh lebih akurat.
3. Sebaiknya pengamatan dilakukan beberapa kali untuk satu variasi sehingga menghasilkan data yang akurat.
Lampiran 6
NILAI K DISTRIBUSI LOG PEARSON TIPE III
Kemencengan Periode Ulang (Tahun)
2 5 10 25 50 100 200 1000(Cs)
3.0 -0.360 0.420 1.180 2.278 3.152 4.051 4.970 7.250
2.5 -0.360 0.518 1.250 2.262 3.048 3.845 4.652 6.600
2.2 -0.330 0.574 1.284 2.240 2.970 3.705 4.444 6.200
2.0 -0.307 0.609 1.302 2.219 2.912 3.605 4.298 5.910
1.8 -0.282 0.643 1.318 2.193 2.848 3.499 4.147 5.660
1.6 -0.254 0.675 1.329 2.163 2.780 3.388 3.990 5.390
1.4 -0.225 0.705 1.337 2.128 2.706 3.271 3.828 5.110
1.2 -0.195 0.732 1.340 2.087 2.626 3.149 3.661 4.820
1.0 -0.164 0.758 1.340 2.043 2.542 3.022 3.489 4.540
0.9 -0.148 0.769 1.339 2.018 2.498 2.957 3.401 4.395
0.8 -0.132 0.780 1.336 1.998 2.453 2.891 3.312 4.250
0.7 -0.116 0.790 1.333 1.967 2.407 2.824 3.223 4.105
0.6 -0.099 0.800 1.328 1.939 2.359 2.755 3.132 3.960
0.5 -0.083 0.808 1.323 1.910 2.311 2.686 3.041 3.815
0.4 -0.066 0.816 1.317 1.880 2.261 2.615 2.949 3.670
0.3 -0.050 0.824 1.309 1.849 2.211 2.544 2.856 3.525
0.2 -0.033 0.842 1.282 1.751 2.054 2.326 2.576 3.090
0.1 -0.017 0.836 1.270 1.761 2.000 2.252 2.482 3.950
0.0 0.000 0.842 1.282 1.751 2.054 2.326 2.576 3.090
-0.1 0.017 0.850 1.258 1.680 1.945 2.178 2.388 3.950
-0.2 0.033 0.850 1.258 1.680 1.945 2.178 2.388 2.810
-0.3 0.050 0.853 1.245 1.643 1.890 2.104 2.294 2.675
-0.4 0.066 0.855 1.231 1.606 1.834 2.029 2.210 2.540
-0.5 0.083 1.856 1.260 1.567 1.777 1.955 2.108 2.400
-0.6 0.099 0.857 1.200 1.528 1.720 1.880 2.016 2.275
-0.7 0.116 0.857 1.183 1.488 1.663 1.806 1.926 2.150
-0.8 0.132 0.856 1.166 1.448 1.606 1.733 1.873 2.035
-0.9 0.148 0.854 1.147 1.407 1.549 1.660 1.749 1.910
-1.0 0.164 0.852 1.128 1.366 1.492 1.588 1.664 1.800
-1.2 0.195 0.844 1.086 1.282 1.379 1.449 1.501 1.625
-1.4 0.225 0.832 1.041 1.198 1.270 1.318 1.351 1.465
-1.6 0.254 0.817 0.994 1.116 1.166 1.197 1.216 1.280
-1.8 0.282 0.799 0.945 1.035 1.0.69 1.087 1.097 1.130
-2.0 0.307 0.777 0.895 0.959 0.980 0.990 1.995 1.000
-2.2 0.330 0.752 0.844 0.888 0.900 0.905 0.907 0.910
-2.5 0.360 0.711 0.771 0.793 0.798 0.799 0.800 0.802
-3.0 0.396 0.636 0.660 0.666 0.666 0.667 0.667 0.668
Cs = 1.49573
1.8-
1.6=
1.8-
1.49573-0.282 -0.254 -0.282 x
0.2=
0.3-0.028 -0.282 x
-0.1 0.2 x = -0.0085190.2 x = -0.1
= -0.325
t Intensitas Curah Hujan ( menit) 1 2 3 4 5
10 63.1086 55.9372 68.1286 71.7143 65.977220 61.6743 60.2400 58.8057 31.5543 25.100030 54.5029 47.3315 44.4629 15.0600 22.231440 53.0686 51.6343 57.3715 54.5029 58.088650 38.7257 44.4629 41.5943 38.7257 38.7257
010 63.1086 55.9372 68.1286 71.7143 65.977220 61.6743 60.2400 58.8057 31.5543 25.100030 54.5029 47.3315 44.4629 15.0600 22.231440 53.0686 51.6343 57.3715 54.5029 58.088650 38.7257 44.4629 41.5943 38.7257 38.725760
Vol. rta2 Vrata-rata
10 37.8000 26.210 36.2000 3610 37.7000 33.410 29.5000 33.5410 29.3000 3610 36.5000 39.3
8 10 12 14 16 18 2025.026.027.028.029.030.031.032.033.034.035.036.037.038.039.040.0
Grafik Hytograph
0 10 20 30 40 50 60 700
10
20
30
40
50
60
Column V
657.3714648.0485947.3314561.6743147.33145
Rata-rata0
57.37146 54.2160348.04859 51.9211747.33145 54.072661.67431 42.3114547.33145 42.02459
52.35145
KESIMPULAN
Berdasarkan hasil pengamatan, maka dapat disimpulkan :Intensitas curah hujan dan keseragamannya pada setiap kontainer untuk setiap variasi berbeda - beda yaitu :
a. Untuk variasi 1 diperoleh :Intensitas curah hujan = 54.216 mm/jamKeseragaman ( Cu ) = 112.275
b. Untuk variasi 2, diperoleh :Intensitas curah hujan = 51.921 mm/jamKeseragaman ( Cu ) = 109.503
c. Untuk variasi 3, diperoleh :Intensitas curah hujan = 54.073 mm/jamKeseragaman ( Cu ) = 109.284
d. Untuk variasi 4, diperoleh :Intensitas curah hujan = 42.311 mm/jamKeseragaman ( Cu ) = 117.627
e. Untuk variasi 5, diperoleh :Intensitas curah hujan = 42.025 mm/jamKeseragaman ( Cu ) = 106.689
f. Untuk variasi 6, diperoleh :Intensitas curah hujan = 52.351 mm/jamKeseragaman ( Cu ) = 100.548
- Dari hasil di atas menunjukkan bahwa intensitas curah hujan terendah itu ada padavariasi 1 = 43.889 mm/jam dan intensitas curah hujan tertinggi ada padavariasi 3 = 53.786 mm/jam.
- Dari hasil di atas menunjukkan bahwa keseragaman terendah itu ada padavariasi 1 = 51.242 dan keseragaman tertinggi ada pada variasi 6 = 59.235