2012-Jawaban1SisipanS1Reguler
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7/23/2019 2012-Jawaban1SisipanS1Reguler
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Djoko Luknanto Soal
Soal Kekasaran Saluran Komposit Manning
Suatu sungai mempunyai kemiringan dasarnya 1,000E-04 dan tampang lintang serta
koefisien kekasaran Manning seperti tampak dalam gambar.
1. Hitung koefisien kekasaran Manning komposit.
2. Hitung debit sungai?
File: Jawaban 1.xlsb Manning Komposit hal. 1 of 2
7/23/2019 2012-Jawaban1SisipanS1Reguler
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Djoko Luknanto Jawaban
Jawaban Soal Kekasaran Saluran Komposit Manning
I II III IV V VI VII 5,00 m
i = 1,000E-04
5,00 m
n = 0,010 n = 0,015 n = 0,020 n = 0,025 n = 0,030 n = 0,035 n = 0,040
7,00 m 10,00 m 4,00 m 15,00 m 3,00 m 5,00 m 6,00 m
No. n A (m2) P (m) P i•n i1.5
P i•n i2 Rumus 1: n co = (0,229897/58,65)^(2/3)
I 0,010 017,5000 008,6023 0,008602 0,000860 = (3,92004E-03)^(2/3)
II 0,015 050,0000 010,0000 0,018371 0,002250 = 0,02486
III 0,020 030,0000 006,4031 0,018111 0,002561 Q = V•A = [ (1/0,025)•5,2859^(2/3)•(√ 1,000E-04) ]•(310,000)
IV 0,025 150,0000 015,0000 0,059293 0,009375 = 378,3676 m3/detik
V 0,030 022,5000 005,8310 0,030299 0,005248 Rumus 2: n co = (0,038916/58,65)^(1/2)
VI 0,035 025,0000 005,0000 0,032740 0,006125 = √ 6,63563E-04
VII 0,040 015,0000 007,8102 0,062482 0,012496 = 0,02576 Jumlah 310,0000 058,6467 0,229897 0,038916 Q = V•A = [ (1/0,026)•5,2859^(2/3)•(√ 1,000E-04) ]•(310,000)
R total 5,28589432 m = 365,1738 m3/detik
Acuan: Ven te Chow, "Open-Channel Hydraulics", International Student Edition, p.136, McGraw-Hill International Book Company, 1959.
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File: Jawaban 1.xlsb Manning Komposit hal. 2 of 2