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20220214 12 Wyandra St SWMP
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plumbed to the tank. A low flow outlet consisting of a 43mm orifice plate in each tank is to be provided to the base
of the OSD storage of each tank, and a 100mm high flow outlet at the head of the tank will provide discharge for
larger storm events.
Using this mitigated development model, the proposed developed flows were again compared to the existing state
as shown below in Table 3.2 Existing and proposed mitigated site peak discharge rates.
Table 3.2 Existing and proposed mitigated site peak discharge rates
Wyandra Street
Qchange
A.E.P Qexisting Qmitigated Qchange (%)
(m³/s) (m³/s) (m³/s)
1EY 0.021 0.021 0.000 0%
50% 0.023 0.023 0.000 0%
0.2 EY 0.035 0.033 -0.002 -6%
10% 0.045 0.041 -0.004 -9%
5% 0.052 0.051 -0.001 -2%
2% 0.060 0.060 0.000 0%
1% 0.065 0.065 0.000 0%
As the total peak flows are equal to or below the existing site conditions for all storm events, the proposed OSD area
will provide the mitigation required for the peak flow storm events from the development.
Page 9 of 15
Project number 20220214
File 20220214 12 Wyandra St SWMP.docx, 2022-09-14 Revision 1
P +61 7 5211 1003 A 75 Noosa Drive, Noosa Heads,Qld 4567 E [email protected] recorconsulting.com
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