BAB VIPERHITUNGAN HIDROLIS SALURAN
I. PERHITUNGAN DIMENSI SALURAN SEKUNDER.
1. SS18
Dik: QSawah = SS18ST11 + SS18ST12 + SS18ST13
= 150 +105 + 165
= 420 Lt/dt
Qsaluran = 420 Lt/dt = 0,42 m³/dt
V = 0,5 m/dt
k = 70
karena b/h = 2
maka n = 2
m = 1 : 1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0,42 0 .5 = 0,84 m²
Asaluran = (2h+h+2h+h¿h ) h =3h2
jadi,
42
2/3
Asaluran = 3h2
2h2 = 0.142
h2 = √ 0 ,843
h = 0,529 m
karena b = 2h maka b = 2 x 0,529 = 1,058
jadi h = 0,529 m h = 52,9 cm
b= 1,058 m b = 105,8 cm
y = √2h2
= (√2(0,529 )2
= 0,748
P = 2y + b
P = ( 2 x 0,748 + 1,058)
P = 2,018
R2/3 =
AP
0 ,842 ,018 R= 0,556
V = k R
23
I
12
0,5 = 70 (0,261) I
12
43
I = ( 0,570 (0 , 556 ) )
2
I = 0,000165
2 SS17
Dik: QSawah = SS17ST10 + SS18
= 135 + 420
= 555 Lt/dt
Qsaluran = 32 Lt/dt = 0,032 m³/dt
V = 0.4 m/dt
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 .0320 . 4 = 0,081 m²
Asaluran = b x h
b = 2h
44
2/3
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0,081
h2 = √ 0.0812
h = 0,201 m
karena b = 2h maka b = 2 x 0,201 = 0,402
jadi h = 0,201 m h = 20,1 cm
b= 0,402 m b = 40,2 cm
P = (2 x h) x 2
= (2 x 0,201) x 2
= 0,805
R2/3 =
AP
0 .0810 .805 R = 0.216
V = k R
23
I
12
0,4 = 45 (0.216) I
12
I = ( 0,445 (0. 216 ) )
2
I = 0,00169
45
3. TTT2S2krP1kr
Dik: QSawah = L x 1,35
= 61 x 1,35
= 82 Lt/dt
Qsaluran = 82 Lt/dt = 0,082 m³/dt
V = 0.4 m/dt
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 .0820 . 4 = 0,206 m²
Asaluran = b x h
46
2/3
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0,206
h2 = √ 0.2062
h = 0,321 m
karena b = 2h maka b = 2 x 0,321 = 0,642
jadi h = 0,321 m h = 32,1 cm
b= 0,642 m b = 64,2 cm
P = (2 x h) x 2
= (2 x 0,321) x 2
= 1,283
R2/3 =
AP
0 .2061. 283 R = 0,295
V = k R
23
I
12
0,4 = 45 (0,295) I
12
I = ( 0,445 (0. 295 ) )
2
I = 0,00091
47
4. TTT1S1knP1kr
Dik: QSawah = L x 1,35
= 38 x 1,35
= 51 Lt/dt
Qsaluran = 51 Lt/dt = 0,051 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 .0510 . 4 = 0,128 m²
48
2/3
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0.128
h2 = √ 0.1282
h = 0.253 m
karena b = 2h maka b = 2 x 0,253 = 0,506
jadi h = 0,253 m h = 25,3 cm
b= 0,506 m b = 50,6 cm
P = (2 x h) x 2
= (2 x 0.253) x 2
= 1,013
R2/3 =
AP
0 .1281, 013 R = 0,252
V = k R
23
I
12
0,4 = 45 (0,252) I
12
I = ( 0,445 (0.252 ) )
2
I = 0,00124
49
5. TTT1S2knP1kr
Dik: QSawah = L x 1,35
= 60 x 1,35
= 81 Lt/dt
Qsaluran = 81 Lt/dt = 0,081 m³/dt
V = 0.4 m/dt
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
50
2/3
V =
QA A =
QV =
0 .0810 . 4 = 0,203 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0.203
h2 = √ 0.2032
h = 0.318 m
karena b = 2h maka b = 2 x 0.318 = 0,636
jadi h = 0,318 m h = 31,8 cm
b= 0,636 m b = 63,6 cm
P = (2 x h) x 2
= (2 x 0.318) x 2
= 1,273
R2/3 =
AP
0 .2031 ,273 R = 0,294
V = k R
23
I
12
0,4 = 45 (0.294) I
12
51
I = ( 0,445 (0. 294 ) )
2
I = 0,00092
6. TTT2S2knP1kr
Dik: QSawah = L x 1,35
= 76 x 1,35
= 103 Lt/dt
Qsaluran = 103 Lt/dt = 0,103 m³/dt
V = 0.4 m/dt
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
52
2/3
Q = A x V
V =
QA A =
QV =
0 .1030 . 4 = 0,257 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0.257
h2 = √ 0.2572
h = 0.358 m
karena b = 2h maka b = 2 x 0.358 = 0,716
jadi h = 0,358 m h = 35,8 cm
b= 0,716 m b = 71,6 cm
P = (2 x h) x 2
= (2 x 0.358) x 2
= 1,432
R2/3 =
AP
0 .2571, 432 R = 0,318
V = k R
23
I
12
53
0,4 = 45 (0.318) I
12
I = ( 0,445 (0. 318 ) )
2
I = 0,00078
7. TTT1S3knP1kr
Dik: QSawah = L x 1,35
= 67 x 1,35
= 90 Lt/dt
Qsaluran = 90 Lt/dt = 0,090 m³/dt
V = 0.4 m/dt
k = 45
karena b/h = 2
maka n = 2
54
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 .0900 . 4 = 0,226 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0.226
h2 = √ 0.2262
h = 0.336 m
karena b = 2h maka b = 2 x 0,336 = 0,672
jadi h = 0,336 m h = 33,6 cm
b= 0,672 m b = 67,2 cm
P = (2 x h) x 2
= (2 x 0.336) x 2
= 1,345
55
2/3
R2/3 =
AP
0 .2261. 345 R = 0,305
V = k R
23
I
12
0,4 = 45 (0.305) I
12
I = ( 0,445 (0. 305 ) )
2
I = 0,00085
8. TTT2S3P1kr
Dik: QSawah = L x 1,35
= 53 x 1,35
= 72 Lt/dt
Qsaluran = 72 Lt/dt = 0.072 m³/dt
V = 0.4 m/dt
k = 45
karena b/h = 2
56
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 .0720 . 4 = 0,179 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0.179
h2 = √ 0.1792
h = 0.299 m
karena b = 2h maka b = 2 x 0.299 = 0,598
jadi h = 0,299 m h = 29,9 cm
b= 0,598 m b = 59,8 cm
P = (2 x h) x 2
57
2/3
= (2 x 0.299) x 2
= 1,196
R2/3 =
AP
0 .1791,196 R = 0,282
V = k R
23
I
12
0,4 = 45 (0,282) I
12
I = ( 0,445 (0 ,282 ) )
2
I = 0,001
9. TTT1P1kn
Dik: QSawah = L x 1,35
= 24,5 x 1,35
= 33 Lt/dt
Qsaluran = 33 Lt/dt = 0,033 m³/dt
V = 0.4 m/dt
k = 45
58
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0,0330. 4 = 0,083 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0,083
h2 = √ 0 ,0832
h = 0,203 m
karena b = 2h maka b = 2 x 0,203 = 0,407
jadi h = 0,203 m h = 20,3 cm
b= 0,407 m b = 40,7 cm
59
2/3
P = (2 x h) x 2
= (2 x 0,203) x 2
= 0,813
R2/3 =
AP
0 ,0830 ,813 R = 0,218
V = k R
23
I
12
0,4 = 45 (0,218) I
12
I = ( 0,445 (0 ,218 ) )
2
I = 0.00167
10. TTT2P1kn
Dik: QSawah = L x 1,35
= 1,5 x 1,35
= 2 Lt/dt
Qsaluran = 2 Lt/dt = 0,002 m³/dt
V = 0.4 m/dt
60
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0,0020. 4 = 0,005 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0,005
h2 = √ 0 ,0052
h = 0,050 m
karena b = 2h maka b = 2 x 0,050 = 0,101
61
2/3
jadi h = 0,050 m h = 5,0 cm
b= 0,101 m b = 10,1 cm
P = (2 x h) x 2
= (2 x 0,050) x 2
= 0,201
R2/3 =
AP
0 ,0050 ,201 R = 0,086
V = k R
23
I
12
0,4 = 45 (0,086) I
12
I = ( 0,445 (0 , 086 ) )
2
I = 0.01072
11. TTT3P1kn
Dik: QSawah = L x 1,35
= 2 x 1,35
= 3 Lt/dt
Qsaluran = 3 Lt/dt = 0,003 m³/dt
V = 0.4 m/dt
62
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0,0030. 4 = 0,007 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0,007
h2 = √ 0 ,0072
h = 0,058 m
karena b = 2h maka b = 2 x 0,058 = 0,116
jadi h = 0,058 m h = 5,8 cm
b= 0,116 m b = 11,6 cm
63
2/3
P = (2 x h) x 2
= (2 x 0,058) x 2
= 0,232
R2/3 =
AP
0 ,0070 ,232 R = 0,094
V = k R
23
I
12
0,4 = 45 (0,094) I
12
I = ( 0,445 (0 , 094 ) )
2
I = 0.00885
12. TTT1S1P1kn
Dik: QSawah = L x 1,35
= 13 x 1,35
= 18 Lt/dt
Qsaluran = 18 Lt/dt = 0,018 m³/dt
64
V = 0.4 m/dt
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 .0180 . 4 = 0,044 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0,044
h2 = √ 0 ,0442
h = 0,148 m
karena b = 2h maka b = 2 x 0,148 = 0,296
jadi h = 0,148 m h = 14,8 cm
65
2/3
b= 0,296 m b = 29,6 cm
P = (2 x h) x 2
= (2 x 0,148) x 2
= 0,592
R2/3 =
AP
0 ,0440 ,592 R = 0,176
V = k R
23
I
12
0,4 = 45 (0,176) I
12
I = ( 0,445 (0 ,176 ) )
2
I = 0.00254
13. TTT1S2P1kn
Dik: QSawah = L x 1,35
= 83 x 1,35
= 112 Lt/dt
66
Qsaluran = 112 Lt/dt = 0,112 m³/dt
V = 0.4 m/dt
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0,1120 . 4 = 0,280 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0,280
h2 = √ 0 ,2802
h = 0,374 m
karena b = 2h maka b = 2 x 0,374 = 0,748
jadi h = 0,374 m h = 37,4 cm
67
2/3
b= 0,748 m b = 74,8 cm
P = (2 x h) x 2
= (2 x 0,374) x 2
= 1,497
R2/3 =
AP
0 ,2801, 497 R = 0,327
V = k R
23
I
12
0,4 = 45 (0,327) I
12
I = ( 0,445 (0 ,327 ) )
2
I = 0.00074
14. TTT1S3P1kn
Dik: QSawah = L x 1,35
= 69 x 1,35
= 93 Lt/dt
68
Qsaluran = 93 Lt/dt = 0,093 m³/dt
V = 0.4 m/dt
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0,0930. 4 = 0,233 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0,233
h2 = √ 0 ,2332
h = 0,341 m
karena b = 2h maka b = 2 x 0,341 = 0,682
jadi h = 0,341 m h = 34,1 cm
69
2/3
b= 0,682 m b = 68,2 cm
P = (2 x h) x 2
= (2 x 0,341) x 2
= 1,365
R2/3 =
AP
0 ,2331 ,365 R = 0,308
V = k R
23
I
12
0,4 = 45 (0,308) I
12
I = ( 0,445 (0 ,388 ) )
2
I = 0.00083
15. TTT2S3P1kn
Dik: QSawah = L x 1,35
= 96 x 1,35
= 130 Lt/dt
70
Qsaluran = 130 Lt/dt = 0,130 m³/dt
V = 0.4 m/dt
k = 45
karena b/h = 2
maka n = 2
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0,1300. 4 = 0,324 m²
Asaluran = b x h
b = 2h
jadi, Asaluran = 2h x h
maka Asaluran = 2h2
Jadi,
2h2 = 0,324
h2 = √ 0 ,3242
h = 0,402 m
karena b = 2h maka b = 2 x 0,402 = 0,805
jadi h = 0,402 m h = 40,2 cm
b= 0,805 m b = 80,5 cm
71
2/3
P = (2 x h) x 2
= (2 x 0,402) x 2
= 1,610
R2/3 =
AP
0 ,3241 ,610 R = 0,343
V = k R
23
I
12
0,4 = 45 (0,343) I
12
I = ( 0,445 (0 ,343 ) )
2
I = 0.0006
II. PERHITUNGAN SALURAN SEKUNDER DAN PRIMER
1. TTS3knP1kr
Dik: QSawah = TTT2S3knP1kr + TTT1S3knP1kr
= 72 Lt/dt + 90 Lt/dt +1
72
= 162 Lt/dt
Qsaluran = 162 Lt/dt = 0,162 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,1620,4 = 0,405 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
Asaluran = 3h2
h2 = √ 0 , 4053
h = 0,232 m
karena b = 2h maka b = 2 x 0,232 = 0,465
73
2/3
jadi h = 0,232 m h = 23,2 cm
b= 0,465 m b = 46,5 cm
y = √2 h2
y = √2 (0 , 232)2
y = 0,329
P = 2y + b
P = (2 x 0,329) + 0,465
P = 1,122
R2/3 =
AP
0 ,4051 ,122 R = 0,507
V = k R
23
I
12
0,4 = 45 (0,507) I
12
I = ( 0,445 (0 ,507 ) )
2
I = 0.00031
2. TTS2knP1kr
Dik: QSawah = TTS3knP1kr + TTT2S2knP1kr + TTT1S2knP1kr
= 162 Lt/dt + 103 Lt/dt + 81 Lt/dt
74
= 346 Lt/dt
Qsaluran = 346 Lt/dt = 0,346 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,3460,4 = 0,865 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
Asaluran = 3h2
h2 = √ 0 ,8653
h = 0,340 m
karena b = 2h maka b = 2 x 0,340 = 0,679
jadi h = 0,340 m h = 34,0 cm
75
2/3
b= 0,679 m b = 67,9 cm
y = √2 h2
y = √2 (0 , 340)2
y = 0,480
P = 2y + b
P = (2 x 0,480) + 0,679
P = 1,640
R2/3 =
AP
0 ,8651 ,640 R = 0,653
V = k R
23
I
12
0,4 = 45 (0,653) I
12
I = ( 0,445 (0 ,653 ) )
2
I = 0.00019
3. TTS1knP1kr
Dik: QSawah = TTS2knP1kr + TTT1S1knP1kr
76
= 346 Lt/dt + 51 Lt/dt
= 397 Lt/dt
Qsaluran = 397 Lt/dt = 0,397 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,3970,4 = 0,993 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
Asaluran = 3h2
h2 = √ 0 ,9933
h = 0,364 m
karena b = 2h maka b = 2 x 0,364 = 0,728
77
2/3
jadi h = 0,364 m h = 36,4 cm
b= 0,728 m b = 72,8 cm
y = √2 h2
y = √2 (0 , 364 )2
y = 0,514
P = 2y + b
P = (2 x 0,514) + 0,728
P = 1,756
R2/3 =
AP
0 ,9931 ,756 R = 0,683
V = k R
23
I
12
0,4 = 45 (0,683) I
12
I = ( 0,445 (0 ,683 ) )
2
I = 0.00017
4. TTS2krP1kr
78
Dik: QSawah = TTT2S2krP1kr + TTT1S2krP1kr
= 82 Lt/dt + 32 Lt/dt
= 114 Lt/dt
Qsaluran = 114 Lt/dt = 0,114 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,1140,4 = 0,285 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
Asaluran = 3h2
h2 = √ 0 ,2853
h = 0,195 m
79
2/3
karena b = 2h maka b = 2 x 0,195 = 0,390
jadi h = 0,195 m h = 19,5 cm
b= 0,390 m b = 39,0 cm
y = √2 h2
y = √2 (0 ,195)2
y = 0,276
P = 2y + b
P = (2 x 0,276) + 0,390
P = 0,941
R2/3 =
AP
0 ,2850 ,941 R = 0,451
V = k R
23
I
12
0,4 = 45 (0,451) I
12
I = ( 0,445 (0 , 451 ) )
2
I = 0.00039
80
5. TTS1krP1kr
Dik: QSawah = TTS2krP1kr + TTT1S1P1kr
= 114 Lt/dt + 57 Lt/dt
= 171 Lt/dt
Qsaluran = 171 Lt/dt = 0,171 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,1710,4 = 0,428 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
Asaluran = 3h2
81
2/3
h2 = √ 0 , 4283
h = 0,239 m
karena b = 2h maka b = 2 x 0,239 = 0,477
jadi h = 0,239 m h = 23,9 cm
b= 0,477 m b = 47,7 cm
y = √2h2
y = √2 (0 , 239)2
y = 0,338
P = 2y + b
P = (2 x 0,338) + 0,477
P = 1,153
R2/3 =
AP
0 , 4281. ,153 R = 0,516
V = k R
23
I
12
0,4 = 45 (0,516) I
12
I = ( 0,445 (0 ,516 ) )
2
I = 0.00030
82
6. TTP1kr
Dik: QSawah = TTS1knP1kr + TTS1krP1kr
= 397 Lt/dt + 171 Lt/dt
= 568 Lt/dt
Qsaluran = 568 Lt/dt = 0,568 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,5680,4 = 1,420 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
Asaluran = 3h2
83
2/3
h2 = √ 1 ,4203
h = 0,435 m
karena b = 2h maka b = 2 x 0,435 = 0,870
jadi h = 0,435 m h = 43,5 cm
b= 0,870 m b = 87,0 cm
y = √2h2
y = √2 (0 , 435 )2
y = 0,615
P = 2y + b
P = (2 x 0,615) + 0,870
P = 2,101
R2/3 =
AP
1, 4202 ,101 R = 0,770
V = k R
23
I
12
0,4 = 45 (0,770) I
12
I = ( 0,445 (0 ,770 ) )
2
I = 0.00013
84
7. TTP0kr
Dik: QSawah = TTP0kr = TTP1kr
= 568 Lt/dt
Qsaluran = 568 Lt/dt = 0,568 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,5680,4 = 1,420 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
85
2/3
Asaluran = 3h2
h2 = √ 1 ,4203
h = 0,435 m
karena b = 2h maka b = 2 x 0,435 = 0,870
jadi h = 0,435 m h = 43,5 cm
b= 0,870 m b = 87,0 cm
y = √2h2
y = √2 (0 , 435 )2
y = 0,615
P = 2y + b
P = (2 x 0,615) + 0,870
P = 2,101
R2/3 =
AP
1, 4202 ,101 R = 0,770
V = k R
23
I
12
0,4 = 45 (0,770) I
12
I = ( 0,445 (0 ,770 ) )
2
I = 0.00013
86
8. TTS3P1kn
Dik: QSawah = TTT2S3P1kn + TTT1S3P1kn
= 130 Lt/dt + 93 Lt/dt
= 223 Lt/dt
Qsaluran = 223 Lt/dt = 0,223 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,2230,4 = 0,558 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
87
2/3
Jadi,
Asaluran = 3h2
h2 = √ 0 ,5583
h = 0,273 m
karena b = 2h maka b = 2 x 0,273 = 0,545
jadi h = 0,273 m h = 27,3 cm
b= 0,545 m b = 54,5 cm
y = √2h2
y = √2 (0 ,273 )2
y = 0,386
P = 2y + b
P = (2 x 0,386) + 0,545
P = 1,316
R2/3 =
AP
0 ,5581 ,316 R = 0,564
V = k R
23
I
12
0,4 = 45 (0,564) I
12
I = ( 0,445 (0 ,564 ) )
2
88
I = 0.00025
9. TTS2P1kn
Dik: QSawah = TTS3P1kn + TTT1S2P1kn
= 223 Lt/dt + 112 Lt/dt
= 335 Lt/dt
Qsaluran = 335 Lt/dt = 0,335 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
89
2/3
V =
QA A =
QV =
0 ,3350,4 = 0,838 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
Asaluran = 3h2
h2 = √ 0 ,8383
h = 0,334 m
karena b = 2h maka b = 2 x 0,334 = 0,668
jadi h = 0,334 m h = 34,4 cm
b= 0,668 m b = 68,8 cm
y = √2 h2
y = √2 (0 , 334 )2
y = 0,473
P = 2y + b
P = (2 x 0,473) + 0,668
P = 1,613
R2/3 =
AP
0 ,8381 ,613 R = 0,646
V = k R
23
I
12
90
0,4 = 45 (0,646) I
12
I = ( 0,445 (0 ,646 ) )
2
I = 0.00019
10. TTS1P1kn
Dik: QSawah = TTS2P1kn + TTT1S1P1kn
= 335 Lt/dt + 18 Lt/dt
= 353 Lt/dt
Qsaluran = 353 Lt/dt = 0,353 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
91
2/3
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,3530,4 = 0,883 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
Asaluran = 3h2
h2 = √ 0 ,8833
h = 0,343 m
karena b = 2h maka b = 2 x 0,343 = 0,686
jadi h = 0,343 m h = 34,3 cm
b= 0,686 m b = 68,6 cm
y = √2 h2
y = √2 (0 , 343)2
y = 0,485
P = 2y + b
P = (2 x 0,485) + 0,686
P = 1,656
R2/3 =
AP
0 ,8831 ,656 R = 0,657
92
V = k R
23
I
12
0,4 = 45 (0,657) I
12
I = ( 0,445 (0 ,657 ) )
2
I = 0.00018
11. TTP1kn
Dik: QSawah = TTS1P1kn + TTT3P1kn + TTT2P1kn + TTT1P1kn
= 353 Lt/dt + 3 Lt/dt + 2 Lt/dt + 33 Lt/dt
= 391 Lt/dt
Qsaluran = 391 Lt/dt = 0,391 m³/dt
V = 0,4 m/dt
k = 45
karena b/h = 2
maka n = 2
93
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,3910,4 = 0,978 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
Asaluran = 3h2
h2 = √ 0 ,9783
h = 0,361 m
karena b = 2h maka b = 2 x 0,361 = 0,722
jadi h = 0,361 m h = 36,1 cm
b= 0,722 m b = 72,2 cm
y = √2 h2
y = √2 (0 , 361)2
y = 0,511
P = 2y + b
P = (2 x 0,511) + 0,722
94
2/3
P = 1,743
R2/3 =
AP
0 ,9781 ,743 R = 0,680
V = k R
23
I
12
0,4 = 45 (0,680) I
12
I = ( 0,445 (0 ,680 ) )
2
I = 0.00017
12. TTP0kn
Dik: QSawah = TTP0kn = TTP1kn
= 391 Lt/dt
Qsaluran = 391 Lt/dt = 0,391 m³/dt
V = 0,4 m/dt
k = 45
95
karena b/h = 2
maka n = 2
m = 1:1 maka m = 1
Dit: Perhitungan saluran = ………….?
JAWABAN:
Q = A x V
V =
QA A =
QV =
0 ,3910,4 = 0,978 m²
Asaluran = ( 2h + h + 2h +h
h )h = 3h2
Jadi,
Asaluran = 3h2
h2 = √ 0 ,9783
h = 0,361 m
karena b = 2h maka b = 2 x 0,361 = 0,722
jadi h = 0,361 m h = 36,1 cm
b= 0,722 m b = 72,2 cm
y = √2 h2
y = √2 (0 , 361)2
y = 0,511
96
2/3
P = 2y + b
P = (2 x 0,511) + 0,722
P = 1,743
R2/3 =
AP
0 ,9781 ,743 R = 0,680
V = k R
23
I
12
0,4 = 45 (0,680) I
12
I = ( 0,445 (0 ,680 ) )
2
I = 0.00017
97