Sheet1SaluranPrimer 2Saluran Pembuangan SaluranAkhirprimer 1 ukuran 20x5x3,1 m3Data :R2 = 100mmC awal = 0.3Salran Primer 1Salran Primer 2tc =25menittc =30menittd =30 menit( 31,1 min)td =30 menit( 31,1 min)tb = 2*tc+(td-tc) =55min (49,3 min)tb = 2*tc+(td-tc) =60min (45,4 min)Q barat =0.086m3/dtQtimur =0.076m3/dt

Lsal =300mLsal =300mUkuran kolam : 15*4*3 mvol kolam=180mHk efektif =2mW =0.3mVol eff = 20*6*2 =200m3Untuk volume limpasan > 200 m3 --> Air mengisi long storage

Data Saluran Pembuang :-B saluran =1.5m-h air=0.6m-S saluran=0.0004-n=0.02m-H saluran =1m(termasuk tinggi jagaan)

a. Menghitung dimensi saluran SP1 dan SP2

SaluranR2 (mm)tc (jam)I = R/24 (24/tc)CAAQ hidrologi = 0,278 .C.I.A (mm/jam)(ha)km(m/dt)SP11000.4262.140.801.20.0120.166SP21000.5055.030.651.80.0180.179

Saluranhb = 2hA = b.hP = b+2hR = A/PS = ((V.n)/R)V = A/TT = bnQ. nR.S.A(m)(m)(m)(m)(m)(m/dt)(m)SP10.5751.150.661252.30.28750.00010.25141964841.150.020.00330.0033SP20.5821.1640.6774482.3280.2910.00010.26710063141.1640.020.00360.0036

b.Menghitung kapasitas kolam yang dibutuhkan , bila tidak memperhitungkan saluran sebagai long storage pada kondisi td = tc c.dan tidak ada pembuangan kesaluran akhir.

Tabel.1 Menghitung kapasitas kolam yang dibutuhkanUntuk td = tc (Hidrograf Rasional)Tidak memperhitungkan saluran sebagai long storage dan tidak ada pembuangan kesaluran akhirtQ in Sal.primer 1Vol in Sal.primer 1Vol in Kum Sal.primer 1Q in Sal.primer 2Vol in Sal.primer 2Vol in Kum Sal.primer 2Vol in kum totalQ out Sal. Tamp akhirH dari dasar(min)(m3/dt)(m3)(m3/dt)(m3)(m3)(m3)(m3)(m3)(m3)(m)1234567891011000000000002.50.0171.2441.2440.0151.1191.1192.36302.3630.01650.0333.7324.9760.0303.3564.4759.45009.4500.0637.50.0506.21911.1950.0455.59410.06921.264021.2640.142100.0668.70719.9020.0607.83117.90037.802037.8020.25212.50.08311.19531.0970.07510.06927.96859.066059.0660.394150.10013.68344.7800.08912.30640.27485.054085.0540.56717.50.11616.17160.9500.10414.54454.818115.7680115.7680.772200.13318.65879.6090.11916.78171.599151.2080151.2081.00822.50.14921.146100.7550.13419.01890.617191.3720191.3721.276250.16623.634124.3890.14921.256111.873236.2620236.2621.57527.50.14921.146145.5350.16423.493135.367280.9020280.9021.873300.13318.658164.1930.17925.731161.098325.2910325.2912.16932.50.11616.171180.3640.16423.493184.591364.9550364.9552.433350.10013.683194.0460.14921.256205.847399.8940399.8942.66637.50.08311.195205.2410.13419.018224.866430.1070430.1072.867400.0668.707213.9490.11916.781241.647455.5950455.5953.03742.50.0506.219220.1680.10414.544256.190476.3580476.3583.176450.0333.732223.9000.08912.306268.496492.3960492.3963.28347.50.0171.244225.1440.07510.069278.565503.7080503.7083.3585000225.1440.0607.831286.396511.5400511.5403.41052.500225.1440.0455.594291.990517.1330517.1333.4485500225.1440.0303.356295.346520.4890520.4893.47057.500225.1440.0151.119296.465521.6080521.6083.4776000225.14400296.465521.6080521.6083.477

maka kapasitas yang dibutuhkan adalah 25 x 6 x 3,5525m

Keterangan :Kolom 1Interval waktuKolom 2Debit saluran Barat per int waktu = (ti+1 -ti)/tc*QmaxKolom 3 :Volume per int waktu = 0,5*(ti+1-ti)*(Qi+1+Qi)*60 m3Kolom 4 :Volume kumulatifKolom 5Debit saluran timur per int waktu = (ti+1 -ti)/tc*QmaxKolo 6 :Volume per int waktu = 0,5*(ti+1-ti)*(Qi+1+Qi)*60 m3Kolom 7 :Volume kumulatifKolom 8 :Volume inflow total saluran barat + saluran timurKolom 9 :Debit out flowKolom 10 :Volume outflowKolom 11Volume outflow kumulatifKolom 12 :Volume total inflow - volume outflowKolom 13 :Tinggi air dari dasar kolam

d.Direncanakan ketinggian dasar saluran SP1 dan SP2 dari dasar kolam = 3me.Bila td = 45 menit, tidak ada pemompaan, hitung volume hujan / limpasan yang terjadi SP1 tb = td+tc = 45 +25 = 70 menitSP2tb = td+tc = 45 +30 = 75 menitTabel B Kemampuan tampung kondisi R2,td = 45 menitTanpa pompatQ in Sal.primer 1Vol in Sal.primer 1Vol in Kum Sal.primer 1Q in Sal.primer 2Vol in Sal.primer 2Vol in Kum Sal.primer 2Vol in kum totalQ out Sal. Vol out PompaVol out Kum Tamp akhirH dari dasar(min)(m3/dt)(m3)(m3/dt)(m3)(m3)(m3)(m3)(m3)(m3)(m3)(m3)(m)1234567891011121300000000000002.50.0171.2441.2440.0151.1191.1192.36300.0000.0002.3630.01650.0333.7324.9760.0303.3564.4759.45000.0000.0009.4500.0637.50.0506.21911.1950.0455.59410.06921.26400.0000.00021.2640.142100.0668.70719.9020.0607.83117.90037.80200.0000.00037.8020.25212.50.08311.19531.0970.07510.06927.96859.06600.0000.00059.0660.394150.10013.68344.7800.08912.30640.27485.05400.0000.00085.0540.56717.50.11616.17160.9500.10414.54454.818115.76800.0000.000115.7680.772200.13318.65879.6090.11916.78171.599151.20800.0000.000151.2081.00822.50.14921.146100.7550.13419.01890.617191.37200.0000.000191.3721.276250.16623.634124.3890.14921.256111.873236.26200.0000.000236.2621.57527.50.16624.878149.2660.16423.493135.367284.63300.0000.000284.6331.898300.16624.878174.1440.17925.731161.098335.24200.0000.000335.2422.23532.50.16624.878199.0220.17926.850187.947386.96900.0000.000386.9692.58035.00.16624.878223.9000.17926.850214.797438.69700.0000.000438.6972.92537.50.16624.878248.7770.17926.850241.647490.42400.0000.000490.4243.26940.00.16624.878273.6550.17926.850268.496542.15100.0000.000542.1513.61442.50.16624.878298.5330.17926.850295.346593.87900.0000.000593.8793.95945.00.16624.878323.4110.17926.850322.195645.60600.0000.000645.6064.30447.50.14923.634347.0450.16425.731347.926694.97100.0000.000694.9714.63350.00.13321.146368.1910.14923.493371.420739.61000.0000.000739.6104.93152.50.11618.658386.8490.13421.256392.676779.52500.0000.000779.5255.19755.00.10016.171403.0190.11919.018411.694814.71400.0000.000814.7145.43157.50.08313.683416.7020.10416.781428.475845.17700.0000.000845.1775.63560.00.06611.195427.8970.08914.544443.019870.91600.0000.000870.9165.80662.50.0508.707436.6040.07512.306455.325891.92900.0000.000891.9295.94665.00.0336.219442.8240.06010.069465.393908.21700.0000.000908.2176.05567.50.0173.732446.5560.0457.831473.225919.78000.0000.000919.7806.13270.00.0001.244447.7990.0305.594478.818926.61800.0000.000926.6186.17772.50.0000.000447.7990.0153.356482.174929.97400.0000.000929.9746.20075.00.0000.000447.7990.0001.119483.293931.09300.0000.000931.0936.207

volume hujan / limpasan yang terjadi=931.093mmaka kapasitas yang dibutuhkan adalah 25 x 6 x 6,5

f.Untuk h kolam > 3,00 m, air masuk long storage. Elevasi dihitung dari Tabel 2 di bawah ini.

Tabel 2. Perhitungan Kedalaman air di KolamKondisi R2 dan td = 30 menit, tanpa pompahxV. KolamLmax salLsal SP1Lsal SP2X SP1X SP2hx SP1hx SP2Vol SP1Vol SP2Vol totalVol HihrgDelH dr dasar(m)(m3)(m)(m)(m)(m)(m)(m)(m)(m3)(m3)(m3)(m3)(m)1234567891011121314150400025030000000.00.0400.0400.00.003.0000.117417.6117.3025030000008.810.6436.95438.701.753.1170.274441.1274.01250300000020.624.7486.31490.424.113.2740.431464.6430.80250300000032.338.8535.70542.156.453.4310.588488.1587.50250300000044.152.9585.06593.888.823.5880.744511.6744.26250300000055.867.0634.44645.6111.163.7440.894534.1893.90250300000067.080.5681.58694.9713.393.8941.000550.01000.00250300000075.090.0715.00739.6124.614.0000.283442.4282.59250300000021.225.4489.02779.52290.513.2830.297444.6297.48250300000022.326.8493.71814.71321.013.2970.309446.3308.6825030058.688.680.0590.00927.628.6502.42845.18342.763.3090.317447.6317.0825030067.0817.080.0670.01728.830.1506.45870.92364.473.3170.324448.6324.2425030074.2424.240.0740.02429.931.4509.88891.93382.043.3240.329449.3328.6025030078.6028.600.0790.02930.532.1511.98908.22396.243.3290.329449.3328.6025030078.6028.600.0790.02930.532.1511.98919.78407.803.3290.329449.3328.6025030078.6028.600.0790.02930.532.1511.98926.62414.643.3290.329449.3328.6025030078.6028.600.0790.02930.532.1511.98929.97418.003.3290.329449.3328.6025030078.6028.600.0790.02930.532.1511.98931.09

Keterangan : hx di hitung dengan cara coba-coba untuk mendapatkan (Volume kolam + Volume long storage barat + volume saluran timur) volume hidrologi per interval waktu. Kolom 12 : Kolom 13 = kolom 2 + kolom 10 + kolom 11 Kolom 12 : Kolom 13 diambil dari Tabel 1 untuk volume > 200 m3

h.

SaluranR2 (mm)tc (jam)I = R/24 (24/tc)CAAQ hidrologi = 0,278 .C.I.AV = tc x Qp (mm/jam)(ha)km(m/dt)mSP11000.4262.140.801.20.0120.166248.78SP21000.5055.030.651.80.0180.179322.20SP akhir1000.5055.030.713.00.0300.326586.56

Saluranhb = 2hA = b.hP = b+2hR = A/PS = ((V.n)/R)V = A/TT = bnQ. nR.S.A(m)(m)(m)(m)(m)(m/dt)(m)SP10.5751.150.661252.30.28750.00010.25141964841.150.020.00330.0033SP20.5821.1640.6774482.3280.2910.00010.26710063141.1640.020.00360.0036SP akhir11.51.53.50.4290.00042.251.50.020.00650.0171

SaluranR2 (mm)tc (jam)I = R/24 (24/tc)CAAQ hidrologi = 0,278 .C.I.AV = tc x Qp (mm/jam)(ha)km(m/dt)mSP11000.4262.140.801.20.0120.166248.78SP21000.5055.030.651.80.0180.179322.20SP akhir1000.5055.030.303.00.0300.138247.84

Sheet2

Sheet3