7/24/2019 gorong-gorong drainase

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4.6 Perencanaan Dimensi Gorong-Gorong

Contoh perhitungan gorong-gorong pada saluran 14-34

Diketahui:

Saluran titik awal = 43

Saluran titik akhir = 14

Jenis saluran = gorong-gorong

Saluran sebelumnya = 41-43, 4-43 !" = #,1$% m3&s'

(an)ang saluran !*s' = $,# m

+emiringan saluran !Ss' = #,##%

+oeisien anning = #,#13 !saluran beton'

.lternati 1:

Jari-)ari gorong-dorong di/oba !r' = #,3# m

. = ,03$ r

= ,03$ !#,3#'

= #,4 m

( = 4,% r

= 4,% !#,3#'

= 1,3%# m

2 = #,#$ r

= #,#$ !#,3#'

= #,1$ m

+e/epatan dalam saluran

=1

nR

2 /3S1/2

=

1

0,013

(0,182)2 /3(0,005)1/2

Perencanaan Drainase Buana Hill Top View Residence

7/24/2019 gorong-gorong drainase

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= 1,0% m&s !ke/epatan yang dii)inkan antara ,# m&s sampai #,

m&s, sehingga diameter bisa dipakai'

+ontrol debit

" = .

= 1,0% #,4= #,431 m3&s 5 " ren/ana !dapat digunakan'

.lternati :

r = #,3# m 6 D = #,# m

h = #,$14 D !S78'

= #,$14 !#,#'

= #,4$ m 9b = D - h

= #,# - #,4$

= #,1 m

y = r-9b

= #,3# - #,1

=#,1$ m

/os a =y

r=0,18

0,30=0,628

a = %3,1%

o

= 3# - a

= 3# ; !%3,1%'

= %4o

* =2a

360 r

2

=254

360(0,30 )2

= 0,199

sin < =x

r

sin %3,1% =x

r

= #,0>> r = #,3>

*? = #,% y

= #,% #,3> #,1$

= #,#

* !.' = * @ *?

= #,1>> @ !#,#'

Perencanaan Drainase Buana Hill Top View Residence

7/24/2019 gorong-gorong drainase

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=#,43

( =

3602r

= 2543602 r

= 1,31

2 =A

P

=0,243

1,31

= #,1

+e/epatan aliran dalam saluran

=1

nR

2 /3S1/2

=1

0,013(0,21)2 /3(0,005)1/2

= 1,>4 m&s !ke/epatan yang dii)inkan antara ,# m&s sampai #,

m&s, sehingga ke/epatan aliran memenuhi'

+ontrol debit

" = .

= 1,>4 #,43

= #,4% m3&s 5 " ren/ana !dapat digunakan'

Perencanaan Drainase Buana Hill Top View Residence