perhitungan irigasi

PERHITUNGAN DR :

1. DR Intake = 1.71 Lt/det/Ha = NFR / 0,65 x 8,64 (Primer) NFR = 0.65 x 8.64 x 1.71 = 9.60

2. DR Sekunder = 9.60 = 1.54 Lt/det/Ha0.8 x 0.9 x 8.64

3. DR Tersier = 9.60 = 1.39 Lt/det/Ha0.8 x 8.64

TABEL PERHITUNGAN DEBIT

Nama Satuan Luas (Ha) DR (l/det/Ha) Debit (l/det)

SIII Ma3 Kanan 100.000 1.390 139.000 0.139SIII Ma3 Kiri 115.625 1.390 160.719 0.161R3 S2 Ma 215.625 1.540 332.063 0.332SIII Ma2 Kiri 71.870 1.390 99.899 0.100R2 S2 Ma 287.495 1.540 442.742 0.443SIII Ma1 Kanan2 53.125 1.390 73.844 0.074SIII Ma1 Kanan1 100.000 1.390 139.000 0.139R1 S2 Ma 440.620 1.540 678.555 0.679SIII Ke1 Kanan 50.000 1.390 69.500 0.070SIII Ke1 Kiri 50.000 1.390 69.500 0.070R2 S2 Kep 100.000 1.540 154.000 0.154SIII Me1 Kanan 67.180 1.390 93.380 0.093SIII Me1 Kiri 73.430 1.390 102.068 0.102R1 S1 Me 681.230 1.710 1164.903 1.165

Debit (m3/det)

Me1 Ka Me1 Kr Ma1 Ka1

Ke1 Ka Ke1 Kr

Ma2 Kr

Ma3 Ka Ma3 Kr

BMe1BMa2BMa1

R1 S2 Ma

R2 S2 Kep

A = 681.230 HaQ = 1164.903 Lt/dtL = 600 m

R3 S2 Me

R2 S2 Ma

BKe1 BMa3

INTAKE

67.18 Ha 73.43 Ha 100 Ha 71.87 Ha

100 Ha 160.7 l/dt 115.625Ha

139 l/dt50 Ha 50 Ha 69.5 l/dt

A = 440.620 HaQ =678.555 Lt/dtL = 1375 m

A = 287.495 HaQ = 442.742 Lt/dtL = 1625 m

A = 100 HaQ = 154 Lt/dtL = 2250 m

A = 215.625 HaQ = 332.063 Lt/dtL = 750 m

Ma1 Ka2

53.13 Ha 99.89 l/dt73.844l/dt

139.00l/dt

69.50 l/dt

93.380l/dt

102.068l/dt

Saluran Primer Menur

Saluran Se

kund

er K

eputih

R1 S1 Me Saluran Sekunder Manyar Saluran Sekunder Manyar

Skema Jaringan


Ke1 Ka Ke1 Kr

Ma2 Kr

Ma3 Ka Ma3 Kr

BMe1BMa2BMa1

R1 S2 Ma

R2 S2 Kep

A = 681.230 HaQ = 1164.903 Lt/dtL = 600 m

R3 S2 Me

R2 S2 Ma

BKe1 BMa3

INTAKE

67.18 Ha 73.43 Ha 100 Ha 71.87 Ha

100 Ha 160.7 l/dt 115.625Ha

139 l/dt50 Ha 50 Ha 69.5 l/dt

A = 440.620 HaQ =678.555 Lt/dtL = 1375 m

A = 287.495 HaQ = 442.742 Lt/dtL = 1625 m

A = 100 HaQ = 154 Lt/dtL = 2250 m

A = 215.625 HaQ = 332.063 Lt/dtL = 750 m

Ma1 Ka2

53.13 Ha 99.89 l/dt73.844l/dt

139.00l/dt

69.50 l/dt

93.380l/dt

102.068l/dt


Saluran Se

kund

er K

eputih



Ke1 Ka Ke1 Kr

Ma2 Kr

Ma3 Ka Ma3 Kr

BMe1BMa2BMa1

R1 S2 Ma

R2 S2 Kep

A = 681.230 HaQ = 1164.903 Lt/dtL = 600 m

R3 S2 Me

R2 S2 Ma

BKe1 BMa3

INTAKE

67.18 Ha 73.43 Ha 100 Ha 71.87 Ha

100 Ha 160.7 l/dt 115.625Ha

139 l/dt50 Ha 50 Ha 69.5 l/dt

A = 440.620 HaQ =678.555 Lt/dtL = 1375 m

A = 287.495 HaQ = 442.742 Lt/dtL = 1625 m

A = 100 HaQ = 154 Lt/dtL = 2250 m

A = 215.625 HaQ = 332.063 Lt/dtL = 750 m

Ma1 Ka2

53.13 Ha 99.89 l/dt73.844l/dt

139.00l/dt

69.50 l/dt

93.380l/dt

102.068l/dt


Saluran Se

kund

er K

eputih


1. Ma3 Kanan

Q = 0.139 m3/det Direncanakan : B = 0.45 m L = 0.3 mZ = 0.15 m

Elevasi sawah tertinggi = 72.80 mSaluran Cacingan = 0.20 mSaluran Kuarter = 0.20 mBox Kuarter = 0.30 mSaluran Tersier = 0.30 mBox Tersier = 0.50 mGenangan = 0.10 +

-->> Elevasi muka air down stream alat ukur = 74.40 m

Drempel Pintu

Hair = 0.42 m a = 0.23 m∆z Au = 0.14

Kontrol : 1/3C < a < 2/3C = OK

-->> Elevasi muka air down stream alat ukur = 74.40 m∆z alat ukur = 1/3.H = 0.14 m

-->> Elevasi muka air up stream alat ukur = 74.54 m∆z pintu = 0.15 m

-->> Elevasi muka air up stream pintu = 74.69 m

𝑄=1,71.𝐿.(𝐻𝑎𝑖𝑟)^(3⁄2)𝐻𝑎𝑖𝑟=(𝑄/(1,71.𝐿))^(2⁄3) 𝑄=𝜇.𝑎.𝑏.√(2.𝑔.𝑧)𝑎=𝑄/(𝜇.𝑏.√(2.𝑔.𝑧))

+74.69

+74.54+74.40

∆z Au = 0.14m∆z = 0,15m

H = 0,42 m

+72.80+74.02 +74.02

Box Kuarter

+0.5 m

Sal. TersierSal. Cacingan

+0.2 m

SawahBox Tersier

+0.3 m +0.3 m

Downstream Alat ukurSal. Kuarter

+0.2 m

3. Ma2 Kiri

Q = 0.100 Lt/det Direncanakan : B = 0.45 m L = 0.35 mZ = 0.15 m



Drempel Pintu

Hair = 0.30 m a = 0.16 m∆z Au = 0.10






+76.85

+76.70+76.60

∆z Au = 0.10m∆z = 0,15m

H = 0.30m

+75.00+76.30

+76.30

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

5. Ma1 Kanan2


Elevasi sawah tertinggi di BKP kn = 79.13 mSaluran Cacingan = 0.20 mSaluran Kuarter = 0.20 mBox Kuarter = 0.30 mSaluran Tersier = 0.30 mBox Tersier = 0.50 mGenangan = 0.10 +


Drempel Pintu

Hair = 0.42 m a = 0.28 m∆z Au = 0.14




-->> Elevasi muka air up stream pintu BKP Kn = 80.96 m


+80.96

+80.73

∆z Au = 0.14m∆z = 0,1 m

H = 0.42 m

+79.13+80.34

+80.86

+80.34

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

7. Ke1 Kanan




Drempel Pintu

Hair = 0.30 m a = 0.14 m∆z Au = 0.10






+71.80

+71.70+71.60

∆z Au = 0.10m∆z = 0,1 m

H = 0.30 m

+70.00+71.30 +71.30

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

9. Me1 Kanan




Drempel Pintu

Hair = 0.29 m a = 0.15 m∆z Au = 0.10






+81.01

+80.86+80.76

∆z Au = 0.10m∆z = 0,15 m

H = 0.29 m

+79.16+80.47

+80.47

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

2. Ma3 Kiri

Q = 0.161 m3/det Direncanakan : B = 0.45 m L = 0.35 mZ = 0.15 m



Drempel Pintu

Hair = 0.42 m a = 0.26 m∆z Au = 0.14





∆z Au = 0.14m


+74.69

+74.54

+74.40

∆z Au = 0.14m∆z = 0,15mH = 0,42m

+72.80+74.02 +74.02

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

4. Ma1 Kanan1




Drempel Pintu

Hair = 0.25 m a = 0.12 m∆z Au = 0.1





∆z Au = 0.10m


+80.96

+80.81

+80.73

∆z Au = 0.10m∆z = 0,15mH = 0.25 m

+79.13+80.46 +80.46

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

6. Ke1 Kiri




Drempel Pintu

Hair = 0.30 m a = 0.14 m∆z Au = 0.10





∆z Au = 0.14m


+71.80

+71.70

+71.60

∆z Au = 0.10m∆z = 0,10mH = 0,30 m

+70.00+71.3 +71.3

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

8. Me1 Kiri




Drempel Pintu

Hair = 0.31 m a = 0.17 m∆z Au = 0.10





∆z Au = 0.10m


+81.01

+80.86

+80.76

∆z Au = 0.10m∆z = 0,15 mH = 0,31 m

+79.16+80.45

+80.45

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

∆z Au = 0.10m

Box Kuarter

+0.5 m


+0.2 m

SawahBox Tersier

+0.3 m +0.3 m


+0.2 m

Rekapitulasi Hasil Perhitungan Elevasi

Nama Saluran Elevasi Muka Air Upstream downstream

Ma3 Kanan 0.139 74.69 74.40Ma3 Kiri 0.161 74.69 74.40Ma2 Kiri 0.100 76.85 76.60Ma1 Kanan1 0.074 80.96 80.73Ma1 Kanan2 0.139 80.96 80.73Ke1 Kanan 0.070 71.80 71.60Ke1 Kiri 0.070 71.80 71.60Me1 Kiri 0.102 81.01 80.76Me1 Kanan 0.093 81.01 80.76

Perhitungan Dimensi Saluran

1. R3 S2 Ma

Q = 0.332

Data dari tabel modul irigasi halaman 27m = K =

b/h =V =

Nama Saluran

R3 S2 Ma 0.332R2 S2 Ma 0.443R1 S2 Ma 0.679R2 S2 Kep 0.154R1 S1 me1 1.165 ``

Debit (m3/det)

Debit (m3/det)

Jari-jari Hidrolis (R)

perhitungan irigasi

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