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Snyder Unit Hydrograph

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  436505749.xls, 09/08/2019, 14:23:24 ANALISA DEBIT BANJIR DIPERUMAHAN KOTA BARU KERINCIMetoda Rasional : Data : - Daerah tangkapan (Catchment Area) [A]=9947.5 ha =99.475 - Daerah terbangun (Dev. Area)=5968.5 ha =59.685 - Daerah tidak terbangun (Undev. Area) =3979.0 ha =39.790- Panjang aliran utama (L)=23500.0 m- Panjang aliran ketitik yang diamati (Lc)=16000.0 m- Elevasi tertinggi (Hmax)=70.0 m- Elevasi terendah (Hmin)=25.0 m- Delta H (Hmax-Hmin)=45.0 m- Kemiringan aliran alami (S)=0.003- Koefisien runoff (C) - Daerah terbangun (C1)=0.80 - Daerah tidak terbangun (C2)=0.50 - Waktu konsentrasi (tc) :  Perhitungan Waktu konsentrasi (tc) menggunakan Formula Kirpich : tc =menit tc = 434.366  menit=7.23944 jam Waktu konsentrasi (tc) minimum adalah 10 menit Perhitungan debit banjir untuk periode ulang 5 tahun, tc = 434.366  menit Intensitas curah hujan yang dipakai (I) = 30.000  mm/jam - Perhitungan Debit banjir (Q) :  Perhitungan debit banjir menggunakan Metoda Rasional : Q =0.278 x C x I x A Q = C =koefisien runoff I =intensitas curah hujan (mm/jam)  A = Q = 564.143   - Analisa kapasitas saluran :  km 2  km 2  km 2 0.0195 (L/sqrt S) 0.77 m 3 /detdebit banjir (m 3 /det)daerah tangkapan air (km 2 ) m 3 /det   Penampang saluran :  436505749.xls, 09/08/2019, 14:23:24Slope dasar saluran (s) =0.500 %Koefisien Manning (n) =0.013Menghitung kapasitas saluran berdasarkan Formula Manning : V = m/detn Qs = n Dimana :V= kecepatan aliran air (m/det)Qs AR= radius hidrolik saluran (m)= A/PP= keliling basah saluran (m)S= kemiringan dasar saluran (%)n= koefisien Manningasumsi b = 2h A =b x h =54.659P =b + 2 x h =4 h =20.911 mR =0.5 h=2.614 mQc =n Qc =6.853Qc =564.143h =5.228 mb =10.455 m - Analisa dimensi gorong-gorong :  Penentuan dimensi gorong-gorong dihitung menggunakan Formula Manning : V = m/detn Qc = n Dimana :Qc =n =Koefisien kekasaran Manning (kondisi normal ) =0.024   S =kemiringan dasar gorong-gorong, digunakan = 0.005  R (2/3)  x S (0.5 ) A x R (2/3)  x S (0.5)  (m 3 /det)= debit banjir (m 3 /det)= luas penampang basah saluran (m 2 )2 h 2 = m 2  2 h 2  x (0.5 h) (2/3)  x S (1/2)  h (8/3)  m 3 /det R (2/3)  x S (0.5 ) A x R (2/3)  x S (0.5)  (m 3 /det)kapasitas aliran gorong-gorong (m 3 /s)  436505749.xls, 09/08/2019, 14:23:24Perhitungan dimensi gorong-gorong dengan menggunakan asumsi tinggi muka air 0.9 D A =(1) P =2.498 D(2) R =0.298 D(3) Dari persamaan (1), (2), (3), kita memperoleh Formula Manning : Qc =nQc = Q = 564.143  m3/s Qc = 0.979  D = 10.844  m Luas penampang culvert = 87.603 Diameter Culvert = 1.00 m A =0.745Jumlah culvert =117.59 =118.00 piecesTotal Area Culvert =87.910Gunakan 118.00  dia. 1000  mm V = 1.314  m/s 0.745 D 2  0.745 D 2  x (0.298 D) (2/3)  x S (1/2)  D (8/3)  m 2  m 2  m 2  436505749.xls, 09/08/2019, 14:23:24 

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Sep 10, 2019
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