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BAB III
PERHITUNGAN CURAH HUJAN
3.1. DATA CURAH HUJAN
No. Tahun
Curah Hujan
Sta A Sta B Sta C
1 1992 199 160 235
2 1993 160 175 180
3 1994 185 225 140
4 1995 175 175 220
5 1996 150 210 265
6 1997 245 150 270
7 1998 240 235 175
8 1999 90 165 190
9 2000 210 135 235
10 2001 215 239 21511 2002 110 240 205
12 2003 210 190 160
13 2004 260 190 105
14 2005 215 240 110
15 2006 90 215 260
16 2007 170 240 235
17 2008 200 160 175
18 2009 195 250 190
19 2010 215 160 210
20 2011 165 225 20021 2012 165 215 186
Sumber : Data Curah Hujan
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ILAI K DISTRIBUSI LOG PEARSO TIPE III
Kemencenan Per!o"e U#an $Tahun%
$C&% ' ( 1) ') '( () 1)) ')) ()) 1)))
3 -0.36 0.42 1.18 1.912 2.278 3.152 4.051 4.97 5.825 7.25
2.5 -0.36 0.518 1.25 1.9246666667 2.262 3.048 3.845 4.652 5.3825 6.62.2 -0.33 0.574 1.284 1.9213333333 2.24 2.97 3.705 4.444 5.1025 6.2
2 -0.307 0.609 1.302 1.9133333333 2.219 2.912 3.605 4.298 4.9025 5.91
1.8 -0.282 0.643 1.318 1.9013333333 2.193 2.848 3.499 4.147 4.714375 5.66
1.6 -0.254 0.675 1.329 1.885 2.163 2.78 3.388 3.99 4.515 5.39
1.4 -0.225 0.705 1.337 1.8643333333 2.128 2.706 3.271 3.828 4.30875 5.11
1.2 -0.195 0.732 1.34 1.838 2.087 2.626 3.149 3.661 4.095625 4.82
1 -0.164 0.758 1.34 1.8086666667 2.043 2.542 3.022 3.489 3.883125 4.54
0.9 -0.148 0.769 1.339 1.7916666667 2.018 2.498 2.957 3.401 3.77375 4.395
0.8 -0.132 0.78 1.336 1.7773333333 1.998 2.453 2.891 3.312 3.66375 4.25
0.7 -0.116 0.79 1.333 1.7556666667 1.967 2.407 2.824 3.223 3.55375 4.105
0.6 -0.099 0.8 1.328 1.7353333333 1.939 2.359 2.755 3.132 3.4425 3.96
0.5 -0.083 0.808 1.323 1.7143333333 1.91 2.311 2.686 3.041 3.33125 3.815
0.4 -0.066 0.816 1.317 1.6923333333 1.88 2.261 2.615 2.949 3.219375 3.67
0.3 -0.05 0.824 1.309 1.669 1.849 2.211 2.544 2.856 3.106875 3.525
0.2 -0.033 0.842 1.282 1.5946666667 1.751 2.054 2.326 2.576 2.76875 3.09
0.1 -0.017 0.836 1.27 1.5973333333 1.761 2 2.252 2.482 3.0325 3.95
0 0 0.842 1.282 1.5946666667 1.751 2.054 2.326 2.576 2.76875 3.09
-0.1 0.017 0.85 1.258 1.5393333333 1.68 1.945 2.178 2.388 2.97375 3.95
-0.2 0.01657978 0.849962 1.25816554 1.5397026163 1.6804711542 1.94570036 2.17894231 2.389197 2.980586511 3.966235718
-0.3 0.05 0.853 1.245 1.5103333333 1.643 1.89 2.104 2.294 2.436875 2.675
-0.4 0.066 0.855 1.231 1.481 1.606 1.834 2.029 2.21 2.33375 2.54
-0.5 0.083 0.856 1.26 1.4646666667 1.567 1.777 1.955 2.108 2.2175 2.4
-0.6 0.099 0.857 1.2 1.4186666667 1.528 1.72 1.88 2.016 2.113125 2.275
-0.7 0.116 0.857 1.183 1.3863333333 1.488 1.663 1.806 1.926 2.01 2.15
-0.8 0.132 0.856 1.166 1.354 1.448 1.606 1.733 1.873 1.93375 2.035
-0.9 0.148 0.854 1.147 1.3203333333 1.407 1.549 1.66 1.749 1.809375 1.91
-1 0.164 0.852 1.128 1.2866666667 1.366 1.492 1.588 1.664 1.715 1.8
-1.2 0.195 0.844 1.086 1.2166666667 1.282 1.379 1.449 1.501 1.5475 1.625
-1.4 0.225 0.832 1.041 1.1456666667 1.198 1.2701 1.318 1.351 1.39375 1.465
-0.0974532207 0.03613072 0.929691 1.34709849 1.6037289507 1.7320441795 1.9480756 2.1060408 2.2302191 2.395082837 2.669855771
-1.6 0.254 0.817 0.994 1.0753333333 1.116 1.166 1.197 1.216 1.24 1.28
-1.8 0.282 0.799 0.945 1.005 1.035 1.069 1.087 1.097 1.109375 1.13
-2 0.307 0.777 0.895 0.9376666667 0.959 0.98 0.99 1.995 1.621875 1
-2.2 0.33 0.752 0.844 0.8733333333 0.888 0.9 0.905 0.907 0.908125 0.91
-2.5 0.36 0.711 0.771 0.7856666667 0.793 0.798 0.799 0.8 0.80075 0.802
-3 0.396 0.636 0.66 0.664 0.666 0.666 0.667 0.667 0.667375 0.668
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3.' PERHITUNGAN CURAH HUJAN RENCANA
3.'.1 Ta*e# D!&tr!*u&! +re,uen&!
No. TahunCurah Hujan
X' (X-X')Sta A Sta B Sta C
1 1992 199 160 235 198.00 39204.00 4.05 16.382 1993 160 175 180 171.67 29469.44 -22.29 496.653 1994 185 225 140 183.33 33611.11 -10.62 112.764 1995 175 175 220 190.00 36100.00 -3.95 15.625 1996 150 210 265 208.33 43402.78 14.38 206.816 1997 245 150 270 221.67 49136.11 27.71 768.087 1998 240 235 175 216.67 46944.44 22.71 515.948 1999 90 165 190 148.33 22002.78 -45.62 2081.109 2000 210 135 235 193.33 37377.78 -0.62 0.3810 2001 215 239 215 223.00 49729.00 29.05 843.7611 2002 110 240 205 185.00 34225.00 -8.95 80.1512 2003 210 190 160 186.67 34844.44 -7.29 53.0813 2004 260 190 105 185.00 34225.00 -8.95 80.1514 2005 215 240 110 188.33 35469.44 -5.62 31.57
15 2006 90 215 260 188.33 35469.44 -5.62 31.5716 2007 170 240 235 215.00 46225.00 21.05 443.0017 2008 200 160 175 178.33 31802.78 -15.62 243.9518 2009 195 250 190 211.67 44802.78 17.71 313.8019 2010 215 160 210 195.00 38025.00 1.05 1.1020 2011 165 225 200 196.67 38677.78 2.71 7.3721 2012 165 215 186 188.67 35595.11 -5.29 27.94
∑ 4073 796339.22222 3.6948222E-013 6371.174603Rata-Rata 193.9523809524
3.'.' Perh!tunan Parameter Stat!&t!, "a#am D!&tr!*u&! +re,uen&!
A. Standar Deviasi
Sx = (( x' - x )2
) ½n-1
= (6371.1746
)½20
= 17.8482136
B. Harga Koefisien Asimetri
Cs =
=
-796743.428571421
2160567.62371548
= -0.3687657909
C. Harga Koefisien Kurtosis
Ck =
=2899326935.74603 2899326935.7694120905.592744 44969152473
= 4.176976824
D. Harga Koefisien Variasi
Distribusi Log Normal
Cv =Sx Cv = 0.0920236893X Cs =
=
=17.8482136 = 0.2845394272193.952381
X² (X-X')²
n.∑ ( x! - x )³(n-1).(n-2).Sx³
n².∑ ( x! - x )⁴(n-1).(n-2).(n-3).Sx⁴
3.Cv"Cv²3.(0#170) " (0#170)²
SYA
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3.'.3 -eto"e o Pear&on III
No Tahun /! $mm% o /!
1 1992 4.047619 0.6072 Err:502 Err:5022
1993 -22.28571 Err:502 Err:502 Err:5023 1994 -10.61905 Err:502 Err:502 Err:5024 1995 -3.952381 Err:502 Err:502 Err:5025 1996 14.38095 1.1578 Err:502 Err:5026 1997 27.71429 1.4427 Err:502 Err:5027 1998 22.71429 1.3563 Err:502 Err:5028 1999 -45.61905 Err:502 Err:502 Err:5029 2000 -0.619048 Err:502 Err:502 Err:502
10 2001 29.04762 1.4631 Err:502 Err:50211 2002 -8.952381 Err:502 Err:502 Err:50212 2003 -7.285714 Err:502 Err:502 Err:50213 2004 -8.952381 Err:502 Err:502 Err:50214 2005 -5.619048 Err:502 Err:502 Err:50215 2006 -5.619048 Err:502 Err:502 Err:50216 2007 21.04762 1.3232 Err:502 Err:50217 2008 -15.61905 Err:502 Err:502 Err:50218 2009 17.71429 1.2483 Err:502 Err:50219 2010 1.047619 0.0202 Err:502 Err:50220 2011 2.714286 0.4337 Err:502 Err:50221 2012 -5.285714 Err:502 Err:502 Err:502
Jumlah Err:502 Err:502 Err:502
n 21
!"# $ Err:502
Err0()'21
S% C& 'n - 1(
Err:502
20 . Err:502
20 20 18 19 . ))) 3
Err0()' Err0()'
*er+a&ar,an nla C& Err:502 ma,a +er"leh nla / untu, &eta er"+e ulan# 'tabel 3(
!"# $ !"# $ / . S%Ta*e# 1.1T (tahun) K o / S2 /! $mm%
2 0.017 Err:502 Err:502 Err0()'
5 0.850 Err:502 Err:502 Err0()'1.258 Err:502 Err:502 Err0()'
15 2.098 Err:502 Err:502 Err0()'
3.'. Ta*e# Re,a4!tu#a&! Perh!tunan Curah Hujan Rencana
Curah Hujan ata -ata +en#an et"+e !"# ear&"n e
EDE !; -
1 2 Err:5022 5 Err:502
3 10 Err:5024 15 Err:502
$o /! 5 o /%' $o /! 5 o /%3
!"# $ - !"# $ n-1 . !"# $ - !"# $
'n - 1('n - 2('n-3('S%(
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3.'. Ta*e# Re,a4!tu#a&! Perh!tunan Curah Hujan Rencana
CH HJ - DE; EDE !; ES
EDE !; -
1 2 Err:502
2 5 Err:502
3 10 Err:502
4 15 Err:502
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3.3 PERHITUNGAN INTENSITAS CURAH HUJAN
3.3.1 Inten&!ta& Curah Hujan Rencana Denan -eto"e -onono*e
I 6 R / $ (( t
D,etahu :
Err:502 mm
Err:502 mm
10 Err:502 mm
15 Err:502 mm
ntu, t 1 jam
Err:502
% '
5
Err:502 mm
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ntu, t 3 jam
Err:502% '
5 Err:502 mm
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0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.50.000
2.000
4.000
6.000
8.000
10.000
12.000
GA!IK IN"#NSI"AS C$AH H$%AN "'D# &'N'N'B#
C$%&n
(a)tu * +am ,
I n t e n s i t a s * m m
- + a m ,
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8.5 8 7.5 7 6.5 6.0 5.5
b =
0 1 2 3 4 5 6
h * C D
C C1 C
9
*0 *1 *2 *3 *4 *5
C0 C1 C2 C3
D0
#>
C1
9.5 E0
?0 ?1 >
C3
;0 ;1 ;2 ;3
@
> $ H0 H1 H2
C3 C3 ?
10
0 1 2
$
J0 J1 J2 J3 J4 C J5 J6
E
ea
Di)etaui /
1 = 0.3 C1 = 0.4 C4 = 0.6
2 = 0.4 C2 = 0.5
3 = 0.5 C3 = 0.7
a = 150 * = 200 k = 200
+ = 300 , = 150 % = 75
= 100 = 100 = 200
/ = 200 ! = 50
= 50 = 200
Lebar %alan 0 "rotoar /
a%an = 25 = 0.5 X0 = 10 X6 = 7
a%an B = 25 X1 = 9.5 X7 = 6.5
a%an C = 25 X2 = 9 X8 = 6
a%an = 25 X3 = 8.5 X9 = 5.5
a%an E = 25 X4 = 8 X10 = 5
A3
A1
A2
3/t!k
3/t!k
3/t!k
C a%an
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BAB I8
PERHITUNGAN DAN PERENCANAAN
.1 DATA DASAR
.1.1 Data Curah Hujan
No TahunCurah Hujan $mm%
Sta A Sta B Sta C
1 1992 199 160 235
2 1993 160 175 180
3 1994 185 225 140
4 1995 175 175 220
5 1996 150 210 265
6 1997 245 150 270
7 1998 240 235 175
8 1999 90 165 1909 2000 210 135 235
10 2001 215 239 215
11 2002 110 240 205
12 2003 210 190 160
13 2004 260 190 105
14 2005 215 240 110
15 2006 90 215 260
16 2007 170 240 235
17 2008 200 160 175
18 2009 195 250 19019 2010 215 160 210
20 2011 165 225 200
21 2012 165 215 186
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.1.' Data To4ora9!
umu& erhtun#an EleBa& anjan# !ahan erjauh +an ,emrn#an lahan
n
m
erhtun#an EleBa& al +an ,hr
$ Jara, areal ,e #ar& ber,utna 'm(
r Jara, antar ,"ntur 'm(
r nterBal antar ,"ntur an# membata& tt,
Sehn##a tn## eleBa& /"ntur -$
erhtun#an anjan# lahan terjauh
6
/emrn#an !ahan
StE aal - E a,hr
% 100!t
en=ar !ua& lahan
m % n
Perh!tunan ua& Area#
PETAK Panjang Lebar Luas
(m) (m) (Ha)
400 590 23.6
400 600 24
400 400 16
> 1000 900 90
> 500 1200 60
> 1200 400 48
> 1000 900 90
> 1000 590 59
$ 1000 600 60
$ 300 400 12
$ 300 900 27
Den#an men#a=u a+a +enah +aat +buat tabel +ata t""#ra@ &eba#a ber,ut :
No Peta, ua& Area# E#e:a&! $ m % Panjan #ahan $ t % Kem!r!nan
$ Ha % A;a# A,h!r $ m % ahan $ < %
1 23.60 8.25 7.45 712.81 0.11223
2 24.00 7.65 6.5 721.11 0.15948
3 16.00 6.85 5.55 565.69 0.22981
4 > 90.00 6.78 5.3 1345.36 0.11001
5 > 60.00 8.78 7 1300.00 0.13692
6 > 48.00 8.37 6.5 1264.91 0.14784
7 > 90.00 8 6.5 1345.36 0.11149
8 > 59.00 9.5 8.45 1161.08 0.09043
9 $ 60.00 9.02 8 1166.19 0.08746
10 $ 12.00 8.8 8.3 500.00 0.10000
t' m2 n2
110109
108
P
Lt
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11 $ 27.00 8.47 7.68 948.68 0.08327
Jum#ah 509.60
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.1.3 Data Sa#uran
No Sa#uranE#e:a&! $ m % Panjan Kem!r!nan
A;a# A,h!r Sa#uran $ m % Sa#uran $ < %
1 7.98 7.45 590 0.09
2 7.38 6.50 600 0.15
3 6.00 5.55 400 0.11
4 5.75 5.30 900 0.05
5 7.80 7.45 400 0.09
6 6.83 6.50 400 0.08
7 6.35 5.55 400 0.20
8 6.35 5.30 1000 0.11
9 8.40 6.90 1200 0.13
10 6.90 6.50 400 0.10
11 7.92 7.00 500 0.18
12 8.15 6.50 1200 0.14
13 6.85 6.50 900 0.04
14 7.63 6.50 1000 0.11
15 8.77 8.45 590 0.05
16 8.38 8.00 600 0.06
17 9.22 8.45 1000 0.08
18 8.80 8.00 1000 0.08
19 8.40 8.30 400 0.02
20 8.25 7.68 900 0.06
21 8.50 8.30 300 0.07
22 8.32 7.68 300 0.21
23 9.50 9.22 590 0.05
24 9.02 8.80 600 0.04
25 8.80 8.50 400 0.08
26 8.47 8.32 900 0.02
0 -
1
2 -
3
4 -
5
6 -
7
*1 -
1
*3 -
3
*5 -
5
D1 -
7
C0 - C
1
C2 - C
3
?1 - C1
H1 - C
3
E0 - E
1
H3 - E
1
;0 - ;
1
;2 - ;
3
J1 - ;
1
J3 - ;
3
0
- 1
2 -
3
J5 -
1
J7 -
3
J0 - J
1
J2 - J
3
J4 - J
5
J6 - J
7
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.'.' Contoh Perh!tunan De*!t
=& 6 )>))'?@ . C&. Cr. I.A
C& 6' tc
t= t" t+' tc t"
t+ !&
B
Cr 6
to 6 ).)1?t
St
,et. :
!ua& areal 'Ha(
!& anjan# Saluran 'm(
!t anjan# lahan terjauh 'm(
St /emrn#an lahan '(
t" Fa,tu untu, men#alr +ar ermu,aan lahan ,e &aluran ter+e,at 'ment(
t+ Fa,tu en#alran +alam &aluran 'ment(
t= Fa,tu en#umulan ar 'ment(
C& /"e@&en enamun#an
Cr /"e@&en en#alran rata-rata
nten&ta& =urah hujan 'mm
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t" 6&
B 0.4 m
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to 6 ).)1? 2t ).??
St
t" 0.0197 %1161.0771 0.77
0.0301
t" 67.0228 ment
t" 6&
B 0.4 m
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+,etahu +ata-+ata &bb :
16.00 Ha 160000
1 Ha 10000
!& 400 m
!t 565.69 m
St 0.0023
Cj 0.5
0.6
to 6 ).)1? 2t ).??
St
t" 0.0197 %565.6854 0.77
0.0479
t" 26.9043 ment
t" 6&
B 0.4 m
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Err:502 m3
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.'.3 TABE PERHITUNGAN DEBIT $=% CURAH HUJAN UNTUK PERIDE UANG ' TAHUN> ( TAHUN> DAN 1) TAHUN
Tabel 4.2.%.#. Debit &en'ana ntu Periode lang 2 Tahun (!aluran Tersier)
No
A#!ran Permu,aan A#!ran "a#am &a#urantc
C& Cr
Curah Hujanua& $A%
t St to & 8 t" T I
$m% men!t $m% m7"t, men!t men!t Thn m7jam
1 712.811 0.0011 42.361 590 0.40 24.583 66.944 0.845 0.500 2 Err:502 23.60 Err:502
2 712.811 0.0011 42.361 400 0.40 16.667 59.027 0.876 0.500 2 Err:502 23.6 Err:502
3 1300.00 0.00136923 62.325 1200 0.40 50.000 112.325 0.818 0.500 2 Err:502 60.00 Err:502
4 1264.91 0.00147836 59.250 400 0.40 16.667 75.916 0.901 0.500 2 Err:502 48.00 Err:502
5 1345.36 0.00111494 69.260 900 0.40 37.500 106.760 0.851 0.501 2 Err:502 90.00 Err:502
6 1161.08 0.00090433 67.023 590 0.40 24.583 91.606 0.882 0.500 2 Err:502 59.00 Err:502
7 500.00 0.001 33.703 400 0.40 16.667 50.370 0.858 0.500 2 Err:502 12.00 Err:502
8 948.68 0.08327331 10.057 900 0.40 37.500 47.557 0.717 0.500 2 Err:502 27.00 Err:502
9 1161.08 0.00090433 67.023 590 0.40 24.583 91.606 0.882 0.500 2 Err:502 59.00 Err:502
10 1166.190 0.0009 68.120 600 0.40 25.000 93.120 0.882 0.500 2 Err:502 60.00 Err:502
11 500.000 0.0010 33.703 400 0.40 16.667 50.370 0.858 0.500 2 Err:502 12.00 Err:502
12 948.683 0.0008 59.218 900 0.40 37.500 96.718 0.838 0.500 2 Err:502 27.00 Err:502
Nama&a#uran
=Rencana$m37"et%m'
0 - 1
1 - *
1
C0 - C
1
C2 - C
3
E0 - E
1
;0 - ;
1
0 -
1
2 -
3
J0 - J
1
J2- J
3
J4 - J
5
J6 - J
7
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Tabel 4.2.%.2 Debit &en'ana ntu Periode lang " Tahun (!aluran !eunder)
No
A#!ran Permu,aan A#!ran "a#am &a#urantc
C& Cr
Curah Hujanua& $A%
t St to & 8 t" T I
$m% men!t $m% m7"t, men!t men!t Thn m7"t,
1 721.110 0.0016 37.333 600 0.40 25.000 62.333 0.833 0.500 5 Err:502 24.00 Err:502
2 721.11 0.0016 37.333 400 0.40 16.667 53.999 0.866 0.500 5 Err:502 24.00 Err:502
3 565.69 0.0023 26.904 400 0.40 16.667 43.571 0.839 0.500 5 Err:502 16.00 Err:5024 1345.36 0.0011 69.619 1000 0.40 41.667 111.285 0.842 0.501 5 Err:502 90.00 Err:502
5 1300.00 0.0014 62.325 500 0.40 20.833 83.158 0.889 0.500 5 Err:502 60.00 Err:502
6 1264.91 0.0015 59.250 1200 0.40 50.000 109.250 0.814 0.500 5 Err:502 48.00 Err:502
7 1345.36 0.0011 69.260 1000 0.40 41.667 110.926 0.842 0.501 5 Err:502 90.00 Err:502
8 1161.08 0.0009 67.023 1000 0.40 41.667 108.690 0.839 0.500 5 Err:502 59.00 Err:502
9 1166.19 0.0009 68.120 600 0.40 25.000 93.120 0.882 0.500 5 Err:502 60.00 Err:502
10 1166.190 0.0009 68.120 1000 0.40 41.667 109.787 0.841 0.500 5 Err:502 60.00 Err:502
11 500.000 0.0010 33.703 300 0.40 12.500 46.203 0.881 0.500 5 Err:502 12.00 Err:502
12 948.683 0.0008 59.218 300 0.40 12.500 71.718 0.920 0.501 5 Err:502 27.00 Err:502
Tabel 4.2.%.% Debit &en'ana ntu Periode lang #$ Tahun (!aluran Primer)
No
A#!ran Permu,aan A#!ran "a#am &a#urantc
C& Cr
Curah Hujanua& $A%
t St to & 8 t" T I
$m% men!t $m% m7"t, men!t men!t Thn m7"t,
1 565.69 0.0022981 26.904 400 0.4 16.667 43.571 0.839 0.500 10 Err:502 16.00 Err:502
2 1345.362 0.0011 69.619 900 0.40 37.500 107.119 0.851 0.501 10 Err:502 90.00 Err:502
Err:502 Err:502
Err:502
Nama&a#uran
=Rencana$m37"et%m'
2 -
3
*3 -
3
*5 -
5
D1 -
7
?1 - C
1
H1 - C
3
H3 - E
1
J1 - ;
1
;2 - ;
3
J3 - ;
3
J5 -
1
J7 -
3
Nama&a#uran
=Rencana$m37"et%m'
4 -
5
6 -
7
At"tal
A '6-
7( A 'D
1-
7(
m3
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02
02
02
02
02
02
02
02
02
02
02
02
u#at!9
et%
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02
02
02
02
02
02
02
02
02
02
02
02
02
02
u#at!9et%
u#at!9
et%
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4. Perhitungan Dimensi Saluran
Dimensi saluran bentuk trapesium
Dimana:
Kecepatan rencana !" # 0.$ m%&tk
K'e(sien kekasaran )annin* n"# 0.02
Kemirin*an talu& rencana m : n # 1 : 2
+
,
1 - 2 -
m
b
enampan* Ek'n'mis
b # 1.5 -
Luas penampang trapesium (A)
A !
/ &imana : # b m.-".-"
Keliling #asah (p)
p
$ari%&ari 'irli* ( R )
R A
P
# b m.-".-
Den*an men**unakan rumus )annin*/ maka ! kecepatan" :
"
Dimana:
! #
3 4 #
p
ket:
#
#p # kelilin* basa- m"
4 # ari6ari -i&r'lis
+,n . R-,3 . S+,-
&ebit m%&tk"
uas m
2
"
b+2h .√ 1+m2
b+2h .√ 1+m2
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# kemirin*an saluran
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#
1.
.
n p
#
# n . ............................................
#
ntuk trapesium &imana b # 1.5 -/ &i&apat:
# b m.-".- / misal m # 1
# 1.5- 1 . - " .-
# 2.5
p ##
#
# $.28 -
Dari persamaan 1/ &i&apat :
# n .
#
#n .
3 n# 0.02
97.;5;#
0.02 .
18.72
5.215 # 0.0000080
# 0.0000015
- # 0.187;1
.............................. 2 "
2% 1%2
n . . 2% 5% . 1%2
5%
p2% 1%2
-2
1.5- 2-.1 " 12
1.5 - 2- . 2
5%
p2% 1%2
2.5.-2 "5 1%
$.28.-"2
1%2
-10
-2 1%2
-81%2
-81%2
%8
1%2
b+2h .√ 1+m2
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Ta#el Perhitungan Dimensi Saluran Tersier
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Ta#el Perhitungan Dimensi Saluran Se*uner
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1.1 Peritungan Dimensi Gorong2gorong dan Keilangan #nergi
Perhitungan Gorong-gorong A3 2 A4
ata-/ata s++
Ban,&nan :%!ntas ,$;$n,-,$;$n, +nt&k S,! :at
= E;;502
= k:atan /! &%& sa%&;an = 0.40 s
= k:atan /!/a%a ,$;$n,-,$;$n, = 1.5 s
= k:atan /! !%!; sa%&;an = 0.4 s
, = :;. ;av!tas! = 9.81
n =
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Keilangan #nergi /
1. k!+at :as&kan
8 6 9.:94 . g
= 0.50
1.5 - 0.40
= 0.0308 2 x 9.81
2. k!+at ,skan
A!%a! k$*!s!n kkasa;an St;!k%; (k) &nt&k +t$n 70
f 6 C* =1
R16
=1
E;;50216
= E;;5024 . g k 70
=E;;502 x 1.5 2
= E;;502 2 x 9.81
3. k!+at :n,%&a;an
o 6 9.334 . g
= 0.11 1.5 - 0.40
= 0.0068 2 x 9.81
4. 6 8 0 f 0 o
= 0.0308 " E;;502 " 0.0068
= E;;502
S)etsa Penam5ang Gorong2Gorong A3 2 A4
E ; ; 9 5 0 2
=
.
/ = E;;502
*v4 2 v
3,4
)2
Cf . v44
*v4 2 v;, 4
) 2
Htotal
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"abel Peritungan Dimensi Gorong2gorong *Bulat,
SK#"SA P#NA&PANG G''NG2G''NG
( )
+ ( )
No Nama Gorong2Gorong
Ke8e5atan Aliran Dimensi KoefisienP
A d b &anning
m-dt m-dt m-dt m m * n , m
1 1 - 2 E;;502 0.40 1.5 0.40 E;;502 E;;502 E;;502 0.02 E;;502
2 3 - 4 E;;502 0.40 1.5 0.40 E;;502 E;;502 E;;502 0.02 E;;502
3 5 - 6 E;;502 0.40 1.5 0.40 E;;502 E;;502 E;;502 0.02 E;;502
4 C1 - B3 E;;502 0.40 1.5 0.40 E;;502 E;;502 E;;502 0.02 E;;502
5 C3 - B5 E;;502 0.40 1.5 0.40 E;;502 E;;502 E;;502 0.02 E;;502
6 E1 - 1 E;;502 0.40 1.5 0.40 E;;502 E;;502 E;;502 0.02 E;;5027 1 - 2 E;;502 0.40 1.5 0.40 E;;502 E;;502 E;;502 0.02 E;;502
8 3 - 1 E;;502 0.40 1.5 0.40 E;;502 E;;502 E;;502 0.02 E;;502
9 1 - 1 E;;502 0.40 1.5 0.40 E;;502 E;;502 E;;502 0.02 E;;502
10 3 - 3 E;;502 0.40 1.5 0.40 E;;502 E;;502 E;;502 0.02 E;;502
No Nama Gorong2Gorong
Keilangan #nergi
8 f o
m m m m
1 1 - 2 0.0308 E;;502 0.0068 E;;5022 3 - 4 0.0308 E;;502 0.0068 E;;5023
5 - 60.0308 E;;502 0.0068 E;;502
4 C1 - B3 0.0308 E;;502 0.0068 E;;5025 C3 - B5 0.0308 E;;502 0.0068 E;;5026 E1 - 1 0.0308 E;;502 0.0068 E;;5027 1 - 2 0.0308 E;;502 0.0068 E;;5028 3 - 1 0.0308 E;;502 0.0068 E;;5029 1 - 1 0.0308 E;;502 0.0068 E;;502
10 3 - 3 0.0308 E;;502 0.0068 E;;502
73 V
3V
4V
;
m; -det m4
Σ
H
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1.: Peritungan Inlet 5ada "rotoar
*!n!s! n%t &+an,-%&+an, /! s!s! a%an an, +;*&n,s! &nt&k na:&n, /an na%&;kan
%!:asan a!; &an an, +;a/a /! s:anan, a%an n&& k /a%a sa%&;an.
!kta&! /ata-/ata s+a,a! +;!k&t
6 - 7
= 900
= 7
= 1
= 10
= 1
=280
x S ≤ 50 D
/!ana D = %+a; a%an ()
s = k!;!n,an a%an () = 2
= a;ak anta;a s;t !n%t ()
=
/!ana
= = %+a; +aan !n%t ()
, = k:atan ,;a*!tas!
/ = k/a%aan a!; ()
A= 2 A>
!k D = 7
S = 0.02 = 2
, = 9.8
• a%&; F;$t$a; an, /!;nanakan
• @anan, Sa%&;an
• +a; a%an
• %+a; t;$t$a;
• a%an " t;$t$a;
• Ba& a%an
• %ara) antara Sreet Inlet * D ,
• Ka5asitas untu) inlet tega)
0#36 x , x /32
ka:as!tas !n%t (3/t)
/t2
Peren8anaan inlet 5ada +alur trotoar
/t2
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%ara) antara Sreet Inlet * D ,
=280
x S ≤ 50 D
280x 2 ≤ 50
7
56.57 ≤ 50 No
S%an&tna &%a !n%t t,ak an, /!+&at /! s:anan, a%an
A =t$t
=900
= 16 56.57
&as 1 !n%t = 12 x D x = 0.5 x 7 x 57
= 0.0198
Ka5asitas inlet tega) *Curb Inlet,
ata-/ata
= 0.02 a st = 2.0
t = 3.501 C = 0.5
s = 900
@;!t&n,an
t$ = 0.0197 ( t ) 1( st ) 0.5
= 0.0197 (3.50069993
)1
= 0.2331 n!t( 2.000 ) 0.5
t/ =s Gnt&k k!;!n,an 0-1 = 0.4
v Gnt&k k!;!n,an 1-2 = 0.6
Gnt&k k!;!n,an 2-4 = 0.9
=900
= 1000.00 /t!k = 16.67 n!t0.9
t = t$ " t/
= 0.233114 " 16.667 = 16.90 n!t
Cs =2 . t
=2 x 16.900
= 0.672 . t " t/ ( 2 x 16.900 ) " 16.67
Guna)an Cura Hu+an &a)simum antara 5eriode ulang 4? :? 39 dan 3: taun
15 =R
x (5
)235 t 60
=
E;;502
x
5 23
= E;;502 a5 16.900 60
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"inggi Genangan Air
/ = 0.046
= 0.046 ( 57 . HHH ( 1 2
= E;;502
/!ana t!n,,! ,nan,an aks!& an, /!!!nkan &nt&k a%&; a%an an, %&;&s = 6.5
A 0.36
/!ana =
, = = 9.81
= +a; +&kaan &;+ ( )
/!a+!% % = 20 = 0.2
/ = k/a%aan a!; /a%a &;+ ()
/!a+!% / = 10 = 0.1
= 0.36 x 9.81 x 0.032 x 0.2
= 0.0223358
= 22.3358 %t/t
S)etsa Inlet /
/ = 0.10
0.20
( . ) 0.5 ( 1 S ) 0.2
) 0.5 ) 0.2
#. +3
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Ta*e# In#et Pa"a Trotoar
" ama Jalan n!ua& '( t0 t+ t=
C&Debt 'A(
'm( 'm( 'm( 'Ha( 'ment( 'ment( 'ment( 'mm
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4. Perhitungan /ut0all *e sungai
>ut?all ke sun*ai @an* &i*unakan a&ala- bentuk trapesium
Diketa-ui &ata sbb:
Debit rencana " # Err:502
Kecepatan air 'ut?all # 0.$0 m%&tk
m # 1.00n # 0.02
Luas penampang #asah (A)
A !
# Err:502
" 0.$0
# Err:502
1en2ari le#ar saluran an *ealaman air
A 3 3 &iasumsikan b # 2-
Err:502 #
- # AAA m
b # AAA m
1en2ari le#ar permu*aan saluran ( T
T # -.m.h
# AAA 2. AA . A
# Err:502
$ari%&ari hirlis ( R )
R A
#
p $.28 -
# Err:502
Err:502
4 # Err:502 m
Tinggi &agaan ( 0# )
0# +. . ! .h+
5
# 2 . AAA . AAA 0.5;0
# Err:502 m
Kehilangan ting*at energi (6)
! @ . A . 4g . 3 &imana : B # k'e(sien &ebit # 1
C # ke-ilan*an tin**i ener*i m"
6 ! * #
@ . A . 4g
# Err:5021 . AAA . 19.;2
C # Err:502 m
m³%&tk
m²
h-
-2
-2
percepatan *ra!itasi m%s2"
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SK7TSA SAL8RA9
Err0()'
E r r : 5 0 2
+ E;;502
E;;502
HHHB
SK7TSA P79A1PA9
Err:502
Err:502
Err:502