7/26/2019 Drainage Design for Soroako_port Channel
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QLD Guidelines
Minimum depth of the settling zone is 0.6 m
Avoid having settling zone greater than 1.0 m
Minimum length:width = 3:1 (single inflow point)
Minimum length:width = :1 (multiple inflow point with
!affles)
"or !asin longer than 10 m# the minimum depth is $%00
&here $ = !asin length (m)
' 0 mm
A 0.1 Km2
Q 0.093 m3/s
80 mm
0.093 m3/s
3.6 360
where: where:
(mm%hr) (mm%hr)
A (ha)
For Pipe
'ainfall *0 mm
Basin Vol= (storage depth 4 settling depth) 5 length 5 depth
= 7 A = 7 A
(m3%s) (m3%s)
A (8m)
9 = .n%0.*6*.21%;3%
7/26/2019 Drainage Design for Soroako_port Channel
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Dis+are #al+ulation or S-all #at+-ents ,rea
EroFe-t : >alantang
Manual used : ueensland 'oad 9rainage 9esign Manual (issued in
Gune 003)
: Australian 'ainfall and 'unoff# 1?
9esign flood : + Bears Average 'e-urren-e nterval (A')
&here :
A = area of -at-hments
!ale 1 #al+ulation o $ "ears ,45 4ainall 5ntensit" and
Dis+are
7at-
hmen
ts
Area
sin(ha
)
7hannel
fallinme
ter Hsing Eoso "9
1 AC> .*3 10 0+ *.? 0.? 13.0 0.0 0.0 0.0 0 1. 0.0 13. ??.
1*.6 1*1.+
.+ 7C9 0.+0 1 3 3.1 0. 10.6 0.0 0.0 0.0 0 1. 0.0 10. 10+.1 131.6
1+0.+
+0 9C/ 0.1 1.+ 6 +. 0.? 10.*? .+ 0.? 1.3 0 1. 0.0 11. 10. 1?.0
1*.+
10 /C 0.6+ 1.+ 1 . 1.+ 10.1? 13.+ 1.* 1. 0 1. 0.0 1.0 10.6 1.6
1*6.?
16* 9C" 0.+* 0.* ** 0.? 0.3 1.** 0.0 0.0 0.0 0 1. 0.0 1.* 101.6
1.+ 1*+.6
?1 >C" 0.61 1 1 +.6 0.? 10.33 1.0 .0 3.0 0 1. 0.0 13.3 100.
1+.+ 1*.
+0 "C 0.0? 0. 11 1. 0. 10.6 3.0 3.0 *.3 0 1. 0.0 1*.6 ?. 1.0
13?.*? CI 0.6 1 33 3.0 0. 10.? 33.0 3.+ +.+ 0 1. 0.0 16.3 ?+. 11.3
13*.
1 IC$ 0.1? 1 1 +.? 0.? 10.31 *1+.0 *. 6.0 0 1. 0.0 16.3 ?+. 11.3
13*.
131 C 0.1? 1 1 +.? 0.? 10.31 0.0 0.0 0.0 0 1. 0.0 10.3 10+.?
133.1 1+1.?
1*0 GC 0.*+ 1 11 ?.1 1.+ 10.1 0.0 0.0 0.0 0 1. 0.0 10.1 106.*
133. 1+.?
Eea8 flow rate -al-ulated using the 'ational Method formula: B=
8 5 7
B5
t-#B5 A
8 = 0. if A in 8mor 8 = 0.00 if A in he-tares.
7+= runoff -oeffi-ient for an A' + Bears (dimension less)
t-#+
= average rainfall intensitB (mm%h) for design duration of t-
hours and A' of + Bears
t-#+
= time of -on-entration (hours) for A' of + Bears
+= + Bears A' design dis-harge in m3%se-.
7a
t-hm
en
ts"a
llin
m
eter
$eng
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f
-a
t-hme
ntsinme
ter
2lopeof
-a
t-hmen
ts
in
Appro
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tream
ve
lo-
itB#
from
