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Tugas Saluran Primer Air Hujan
 Intesnsitas Hujan : 12.30 mm/jam
 Luas Lahan
a. Lahan I : 100 Ha
b. Lahan II : 200 Ha
 Tabel Jenis Penggunaan lahan
JENIS PENGGUNAAN LAHAN Meresap Air Melimpah
Perkantoran, Pusat
Perbelanjaan Dgn Area Parkir
Dari Perkerasan Aspal.
10 – 30 Antara 70 – 90 %
Hutan (Kebun Lebat), Ladang
Berumput.
80 - 100 Antara 0 – 20 %
 Ω (OMEGA) : Koefisien Pengaliran
Jika luas lahan lebih dari 1 ha, air hujan yang melalui hujan dikali dengan koefisien
pengaliran.
  (KSI) : Koefisien Hambatan
Tabel Harga koefisien
 Persamaan Debit air yang masuk kedalam saluran
Q = Ω x  x F x tinggi hujan / jam
Contoh soal
DAERAH I = 60 Ha
- RTH (10 Ha)
Ω = 10 %
n = 7
 = 0,72
Q =  x Ω x F x TINGGI HUJAN / Jam
= 0,72 x 0,10 x 10 x 12,3 MM / Jam
Q = 0,72 x 0,10 x 200.000 x 12.3 x10-3
m / jam = 177.12 ~ 177 m3
/Jam
- Fasum/ Fasos ( 20 Ha)
Ω = 20 %
n = 5
 = 0,55
Q = 0,55 x 0,20 x 20 000 x 12,3.10-3
m / Jam = 405,9 ~ 406 m3
/Jam
- Pemukiman = 30 Ha
Ω = 20 %
n = 4
 = 0,4375
Q = 0,437 x 0,20 x 30 000 x 12,3.10-3
m / Jam = 320,292 ~ 320 m3
/Jam
Buat Tabel Rekapitulasi
Daerah/ Lahan Luas (Ha)  Ω (%) Debit (m3
)
LAHAN I
a. RTH
b. Fasum-Fasos
c. Pemukiman
LAHAN II
a. RTH
b. Pemukiman
c. Fasum – Fasos
d. Jasa
60
10
20
30
0.72
0.55
0,4375
10
20
20
177
406
320
Tugas saluran (air hujan)

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Tugas saluran (air hujan)

  • 1. Tugas Saluran Primer Air Hujan  Intesnsitas Hujan : 12.30 mm/jam  Luas Lahan a. Lahan I : 100 Ha b. Lahan II : 200 Ha  Tabel Jenis Penggunaan lahan JENIS PENGGUNAAN LAHAN Meresap Air Melimpah Perkantoran, Pusat Perbelanjaan Dgn Area Parkir Dari Perkerasan Aspal. 10 – 30 Antara 70 – 90 % Hutan (Kebun Lebat), Ladang Berumput. 80 - 100 Antara 0 – 20 %  Ω (OMEGA) : Koefisien Pengaliran Jika luas lahan lebih dari 1 ha, air hujan yang melalui hujan dikali dengan koefisien pengaliran.   (KSI) : Koefisien Hambatan Tabel Harga koefisien  Persamaan Debit air yang masuk kedalam saluran Q = Ω x  x F x tinggi hujan / jam
  • 2. Contoh soal DAERAH I = 60 Ha - RTH (10 Ha) Ω = 10 % n = 7  = 0,72 Q =  x Ω x F x TINGGI HUJAN / Jam = 0,72 x 0,10 x 10 x 12,3 MM / Jam Q = 0,72 x 0,10 x 200.000 x 12.3 x10-3 m / jam = 177.12 ~ 177 m3 /Jam - Fasum/ Fasos ( 20 Ha) Ω = 20 % n = 5  = 0,55 Q = 0,55 x 0,20 x 20 000 x 12,3.10-3 m / Jam = 405,9 ~ 406 m3 /Jam - Pemukiman = 30 Ha Ω = 20 % n = 4  = 0,4375 Q = 0,437 x 0,20 x 30 000 x 12,3.10-3 m / Jam = 320,292 ~ 320 m3 /Jam Buat Tabel Rekapitulasi Daerah/ Lahan Luas (Ha)  Ω (%) Debit (m3 ) LAHAN I a. RTH b. Fasum-Fasos c. Pemukiman LAHAN II a. RTH b. Pemukiman c. Fasum – Fasos d. Jasa 60 10 20 30 0.72 0.55 0,4375 10 20 20 177 406 320