Nomenklatur

SKEMA IRIGASI

SALURAN PRIMER TONJONG KOLOTSALURAN PRIMER BABAKAN

BN.0A=AA=Q=RUAS 1BT 1QRUAS 2BT 2Q=RUAS 1BB1L=LL=

T.1 KnT.1 KrT.2 KnT.2 KrB.1 KnB.1 Kr

A=Q=A=L=Q=SALURAN SEKUNDERRUAS 1Sungai CiawiL=TONJONG KOLOTRUAS 1SALURAN SEKUNDERLAMEJAJAR

A=Q=L=C.1 Kr

BN1SALURAN SEKUNDER CIGENANGBC1RUAS 1BJ 1

N.1KnN.2 KrC.1 KnJ.1 KnJ.1 Kr

CURAH HJData Curah Hujan Setengah Bulanan (mm)

TahunJanuariFebruariMaretAprilMeiJuniJuliAgustusSeptemberOktoberNovemberDesember121212121212121212121212200278861701261029572106126128687361633052612394386521381362003749514212597869715348767961456264221606239126681182004126525296741096954038000061200151516414512319720051148698142154193124191778401451571573565241121219711112020061851128185214243105169246240105321023310514212012621014820072941321067611331221812740566180002101548341451041089820081031427087173154108983883425996466111124962108981562141269620091251752512081201121581396084202336232132702611011421235697137201011287626479126162821351153010008002212265414221720119414519220424532111320662966482538227242649951101321299772Data Curah Hujan Setengah Bulanan (mm)

JanuariFebruariMaretAprilMeiJuniJuliAgustusSeptemberOktoberNovemberDesember1212121212121212121212121745252647486695403800000200062652687227886627679957282245600006800151286549796R8039486708597109979840623143010123102215120979798410387818711311210510648766184211126122434121104108118R5051129598961201261081276084202355142310153942132126111120611411210612515415411313962844061101521242216484314512612313671251321421261731931241537796597336232732262651981641291261378126142170142192243158169126115648246613052354995110212145138148918514519220421431216219113512868965363625749621081122392141421971029417525120824532121820638834279105618271647065110114256356210217Perhitungancontoh : Januari '1contoh: Januari '1

R80 = n/5+1R80 eff =0,7 x R80R50 =n/2R50 eff=0,7 x R50R80 = 10/5+1R80 eff =0,7 x 94R50 =10/2R50 eff=0,7 x 112R80= 3R80 eff =65.8mm/hrR50 =5R50 eff=78.4mm/hr

R8065.860.24959.567.976.367.968.62843.42.19.82.1078.42.1715.410.58467.967.968.6

R5078.466.568.667.28488.275.688.94258.81416.13.53.59.816.1710.527.329.492.488.277.784Data Debit Setengah Bulanan Sungai di lokasi Bendung (l/det)

TahunJanFebMarAprMayJunJulAugSepOctNovDec121212121212121212121212200228362840300030242021202925982604140514058218353793834864987968301257126922982318272026982003268226762696270419911849214721731356137485479635035844451449748710281042224722592657266520042338234224992487198419942157215712241436689727248380360390396396942942185718632640265020052240222023042710178517851902191811901204716649250222278274328350878886161916572493250520062212221820462024177317571746177611481168580568183186220230327339780768153715472420241020072022201819431897170416891638160210581072438436120126176202296322721737145714472345233520081742175617261730149414881458144010601046497359103102105105249252539523139813862311234020093346332435143507438643544307436634383408112411149839831058106611281110658626255325413708327020103948397243144336532253405192516435803560158115879969961590114329102910453944593947396755135527201157945816537153495581556754225432432643441610161897910011326132013071315133313401711169772604248

RENoJanFebMarAprMayJunJulAugSepOctNovDec121212121212121212121212RePadi3.07066666672.80933333332.28666666672.77666666673.16866666673.56066666673.16866666673.20133333331.30666666672.02533333330.0980.45733333330.09800.32666666670.3920.0980.32666666670.71866666670.493.923.16866666673.16866666673.2013333333Palawijaya3.65866666673.10333333333.20133333333.1363.924.1163.5284.14866666671.962.7440.65333333330.75133333330.16333333330.16333333330.45733333330.75133333330.32666666670.491.2741.3724.3124.1163.6263.92

R8065.860.24959.567.976.367.968.62843.42.19.82.1078.42.1715.410.58467.967.968.6

R5078.466.568.667.28488.275.688.94258.81416.13.53.59.816.1710.527.329.492.488.277.784

TABEL KOEF

Data Evapotranspirasi Potensial

BulanJanFebMarAprMayJunJulAugSepOctNovDecEto(mm/hr)2.983.022.792.7432.8182.7973.0513.4513.813.7413.453.091

Data Satuan Kebutuhan Air di Sawah (SKA)Koefisien Tanaman untuk Padi

TanamanSatuan Kebutuhan Air (l/det/ha)PERIODE TENGAH BULANANPADIKEDELAIMT 1MT 2MT 3Waktu (hari)NEDECO/PROSIDAFAOVarietasVarietasa. PadiBiasaUnggulBiasaUnggul -Pengolahan1.251.253011.21.21.11.10.5 -Vegetatif0.750.853021.21.271.11.10.75 -Reproduksi0.750.853031.321.331.11.051 -Pemasakan0.30.31541.41.31.11.051 -Panen001551.351.31.10.950.82b. Palawija0.312061.2401.0500.4571.120.95800

Kebutuhan Air untuk Penyiapan Lahan (LP)

M= Eo + PLP30 hari45 harimm/hr250300250300511.112.78.49.55.511.4138.89.8611.713.39.110.16.51213.69.410.4712.313.99.810.87.512.614.210.111.181314.510.511.48.513.314.810.811.8913.615.211.212.19.51415.511.612.51014.315.81212.910.514.716.212.413.2111516.512.813.6

WLR

Menghitung Nilai Koefisien tanaman JanFebMarAprMayJunJulAugSepOctNovDec121212121212121212121212C1LPLP1.21.271.331.31.3000.50.75110.820.4500LP1.271.271.331.31.30C2LPLPLP1.21.271.331.31.3000.50.75110.820.4500LP1.21.271.331.31.3C31.3LPLP1.21.271.331.31.3000.50.75110.820.4500LP1.21.271.331.3CLPLPLP1.241.271.301.310.870LPLPLP0.920.940.760.420.1500.641.241.271.301.310.87

Menghitung Nilai WLRJanFebMarAprMayJunJulAugSepOctNovDec121212121212121212121212WLR13.33.33.33.33.33.3-WLR23.33.33.33.33.33.3-WLR33.33.33.3-3.33.33.3WLR1.11.11.12.201.102.201.101.10-1.11.12.201.102.201.10

Q

r80

Data Curah Hujan Setengah Bulanan (mm)

JanuariFebruariMaretAprilMeiJuniJuliAgustusSeptemberOktoberNovemberDesember1212121212121212121212121745252647486695403800000200062652687227886627679957282245600006800151286549796R8039486708597109979840623143010123102215120979798410387818711311210510648766184211126122434121104108118R5051129598961201261081276084202355142310153942132126111120611411210612515415411313962844061101521242216484314512612313671251321421261731931241537796597336232732262651981641291261378126142170142192243158169126115648246613052354995110212145138148918514519220421431216219113512868965363625749621081122392141421971029417525120824532121820638834279105618271647065110114256356210217

NoBlnR80AP-IAP-IIR80-IR80-IIReff-IReff-IINoBlnR50Jumlah hariReff

1Jan9494.758848.73645.2642.2742.1121Jan112312.52903225812Feb707676.7534.82835.1721.6251.6412Feb98282.453Mar9790.259746.75250.2482.1822.3453Mar113312.55161290324Apr979782.7552.34544.6552.4432.0844Apr108302.525May4054.2530.7525.52914.4711.1910.6755May60311.35483870976Jun312.2532.4100.5900.1120.0286Jun20300.46666666677Jul334.751.1611.8390.0540.0867Jul5310.11290322588Aug108.258.255.0005.0000.2330.2338Aug14310.31612903239Sep34.757.751.1401.8600.0530.0879Sep10300.233333333310Oct2217.2546.55.95316.0470.2780.74910Oct39310.880645161311Nov12095.5114.2554.63665.3642.5503.05011Nov132303.0812Dec97102.7596.2550.08446.9162.3372.18912Dec111312.5064516129

NoBlnR80AP-IAP-IIR80-IR80-IIReff-IReff-IINoBlnR50Jumlah hariReff

1Jan868985.7543.80042.2002.0441.9691Jan95312.14516129032Feb8585.259141.11343.8871.9192.0482Feb96282.43Mar109103106.2553.65455.3462.5042.5833Mar126312.84516129034Apr98100.758952.03445.9662.4282.1454Apr127302.96333333335May62715036.38025.6201.6981.196`5May84311.89677419356Jun142610.59.9734.0270.4650.1886Jun23300.53666666677Jul03.530.0000.0000.0000.0007Jul5310.11290322588Aug12911.55.2686.7320.2460.3148Aug23310.51935483879Sep1010.511.254.8285.1720.2250.2419Sep15300.3510Oct1513.7535.54.18810.8120.1950.50510Oct42310.948387096811Nov9776.597.2542.70854.2921.9932.53411Nov126302.9412Dec9897.759549.69948.3012.3192.25412Dec120312.7096774194

pola tata tanamPerhitungan Kebutuhan Air Irigasi

NoUraianSatuanJanuariFebruariMaretAprilMeiJuniJuliAgustusSeptemberOktoberNovemberDesember1212121212121212121212121Pola Tata TanamPADI IPALAWIJA (Buncis)PADI II

2Koefisien Tanamank1LPLP1.21.271.331.31.3000.50.75110.820.4500LP1.271.271.331.31.30k2LPLP1.21.271.331.31.3000.50.75110.820.4500LP1.21.271.331.31.3k31.3LPLP1.21.271.331.31.3000.50.75110.820.4500LP1.21.271.331.33Rerata Koefisien TanamanLP01.21.2351.26666666671.31.310.86666666670.43333333330.16666666670.41666666670.750.91666666670.940.75666666670.42333333330.1500.6351.2351.26666666671.31.310.86666666674Evapotranspirasi Potensial (Eto)mm/hr2.982.983.023.022.792.792.7432.7432.8182.8182.7972.7973.0513.0513.4513.4513.813.813.7413.7413.453.453.0913.0915Kebutuhan Air Bagi Tanaman (ET)(3) x (4)mm/hr0.0000.0003.6243.7303.5343.6273.5932.3771.2210.4701.1652.0982.7972.8682.6111.4610.57202.3764.6204.3704.4854.0492.6796Keb. Air untuk Penyiapan Lahan (Pd)mm/hr6.5566.5566.5566.5567.38847.38847.38847.38847Ratio Penyiapan Lahan0.250.250.250.250.250.250.250.258Keb. Air untuk Penyiapan Lahan dg Ratio(6) x (7)mm/hr1.6391.6391.6391.6391.84711.84711.84711.84719Perkolasi (P)mm/hr33333333333333333310Penggantian Lapisan Air (WLR)mm/hrWLR 13.33.33.33.33.33.3WLR 23.33.33.33.33.33.3WLR 33.33.33.3-3.33.33.3Rerata WLR1.11.11.12.201.102.201.101.10-1.11.12.201.102.201.1011Ratio Luas Tanaman0.750.250.250.7511110.750.50.7511110.750.2500.250.75111112Kebutuhan Air (5+9+10)x(11)mm/hr2.2500.7502.4815.0479.8346.6279.8935.3773.1661.7350.8742.0982.7972.8682.6111.0960.8930.0002.1695.71510.6707.48510.3495.67913Curah Hujan Efektif (Re)mm/hr4.3874.0133.2673.9674.5275.0874.5274.5731.8672.8930.1400.6530.1400.0000.4670.5600.1400.4671.0270.7005.6004.5274.5274.57314Ratio Luas Hujan Efektif (Total Ratio)10.50.5111110.750.50.7511110.750.50.250.51111115Curah Hujan Efektif dengan Ratiomm/hr4.3872.0071.6333.9674.5275.0874.5274.5731.4001.4470.1050.6530.1400.0000.4670.4200.0700.1170.5130.7005.6004.5274.5274.57316Kebutuhan Air Netto di Sawahmm/hr0.0000.0000.0001.0815.3071.5405.3670.8041.7660.2880.7691.4442.6572.8682.1450.6760.8230.0001.6565.0155.0702.9585.8231.10617Kebutuhan Air Netto di Sawahl/dt/ha0000.12502638420.61405846670.17821656670.62092294770.09301508670.2043088450.03334088330.08898053120.16711900830.3073859750.3318206580.2481290630.07817762220.095206637500.19154718320.58024721460.5865990.34227916670.67366826370.127910206718Efisiensi Irigasi (e) (eff.Tersier)x(eff.Sekunder)x(eff.primer)0.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.6650.66519Kebutuhan Air Irigasi di Intake (Dr)l/dt/ha0000.18800960030.92339619050.26799483710.93371871830.13987231080.30723134590.05013666670.13380531020.25130677940.46223454890.49897843310.37312641050.11756033420.143167875900.2880408770.87255220240.88210375940.51470551381.0130349830.1923461754

Contoh Perhitungan :Pd = (M x ek) / (ek - 1)P=3Pd = (6.278 x e^0.753) / (e^0.753 - 1)T =30 hariPd = 6.556mm/hrS = 250 mm

M =(Eto x 1,1) + PM =(2.98 x 1,1) + 3M =6.278

k =M.T / Sk =6.278x30/250k =0.753

Pd = (M x ek) / (ek - 1)P=3Pd = (7.191 x e^0.863) / (e^0.863- 1)T =30 hariPd = 7.388mm/hrS = 250 mm

M =(Eto x 1,1) + PM =(3.81 x 1,1) + 3M =7.191

k =M.T / Sk =7.191x30/250k =0.863

LPLPLPLPLPLP

skema

SKEMA IRIGASI

SALURAN PRIMER TONJONG KOLOTSALURAN PRIMER BABAKAN

BN.0A=566.9 haA176.38 haA=103.52 haQ=629.43 lt/dtRUAS 1BT 1Q179.97RUAS 2BT 2Q=105.531RUAS 1BB1L=875 mL980 m L=520 m

T.1 KnT.1 KrT.2 KnT.2 KrB.1 KnB.1 Kr76.5 HA51.5380545.46 HA30.62640243.7 HA29.4406929.16 HA19.64509217.33 HA11.67522140.32 HA27.163584

A=268.56 haQ=308.44 lt/dtA=45.87 haL=1240 mQ=48.47 lt/dt/haSALURAN SEKUNDERRUAS 1Sungai CiawiL=1360 mTONJONG KOLOTqmaks=0.6737l/dt/haRUAS 1SALURAN SEKUNDERLAMEJAJAR

A=119.71 haQ=126.5 lt/dtL=1355 mC.1 Kr45.46 HA30.626402BN1SALURAN SEKUNDER CIGENANGBC1RUAS 1BJ 1

N.1KnN.2 Kr76.5 HA51.5380574.25 HA50.022225C.1 KnJ.1 KnJ.1 Kr74.25 HA50.02222536.26 HA24.4283629.61 HA6.474257

DEBIT LAHANPERHITUNGAN DEBIT PETAKPERHITUNGAN DEBIT SALURAN DAN BANGUNANRUMUS Q = A X QmaxEfisiensi saluranMaterial SaluranPrimer0.95Primer: BetonNama lahanLuas (Ha)Q max(lt/dt)Q (lt/dt/ha)sekunder 0.85Sekunder: Pasangan BatuT.1 kn76.50.673751.53805tersier0.75Tersier: Tanah BersihT.1 kr45.460.673730.626402N.1 kn76.50.673751.53805N.1 kr74.250.673750.022225C.1 kn74.250.673750.022225Q BJ.1C.1 kr45.460.673730.626402T.2 kn43.70.673729.44069T.2 kr29.160.673719.645092B.1 kn17.330.673711.675221B.1 kr40.320.673727.163584J.1 kn36.260.673724.428362J.1 kr9.610.67376.474257126.4941176471

Sheet1

q= 0.0006737m3/dt/haNoNama SaluranA (m2)Q (m3/det)b/h = nmVbhAPRR2/3KHLIhitunglapanganSALURAN SEKUNDER1Sal.sekunder Cigenang r.111971000.127110.2650.48850.48850.47741.46560.32570.03544526.687506.2500.1670.0527150617SALURAN PRIMER2Sal. Primer Tonjong kolot r.217638000.180110.2170.6440.6440.8291.9320.4290.0614511.092756.2500.0780.01466710743Sal. Primer Tonjong kolot r.156690000.629210.5001.2960.6481.2592.5910.4860.079451.900264.0630.1410.0071952663

Contoh Perhitungan :A =Q / VP =b + 2h(1+m2)1/2(n+m)h2=0,127/0,265P =0,4895 + (2x4895(1+12)1/22h2=0.47924P =1.4656mh=0.4895mR =A / Pb =n x hR =0,4044 / 1,3491b =1 x 0,4895R =0.3257mb =0.4895mI hitung = V / K x R2/3I lapangan = H / LA =(n + m)h2I hitung = 0,265/(45*0,035)I lapangan = 26,687 / 506,250A =(1 + 1)0,4895I hitung = 0.1665I lapangan = 0.0527A =0.4774m2