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Attachment I - Updated Engineering Report & SWMP
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INPUT
Rainfall Intensities (mm/hour) *
AEP 63.20% 50% 10% 2% 1%
5 minute storm 123 140 225 299 330
10 minute storm 101 114 180 235 257
30 minute storm 60.3 68.3 109 143 158
60 minute storm 40 45.5 74.3 100 112
120 minute storm 25.9 29.7 50.1 69.4 78.1
* default intensities set for Maroochydore (from BOM)
* default temporal patterns set for East Coast (North) (from ARR)
Catchment Information (5 minute time of concentration)
Area (m’
2539
2035
504
Cis*
0.82
0.9
0.82
* Cig values derived from QUDM
Fraction Impervious
0.60
1.00
0.60
¥
¥
Light cover bushland, or Poor grass cover, or Lol}
[Lowscipermeabiity —=—=—=S*~S~S*«~w*S: ~ Orifice & Weir Configuration
Low soil permeability
Lb
Detention Tank Information
Tank base width (m) = 48
Tank base length (m) = 48 O
Orifice flow discharge coeffecient C, = 0.62
Side wall slope = lino
* 1 in O slope indicates vertical walls O O
Tank Outlet Information
Orifice Number 1 2 3 4 5 6 Overflow Weir
Diameter (mm) 100 150 150 Length (mm) 1600
Invert level (mm) 0 I 0 300 Invert level (mm) 700
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