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Site Based Stormwater Managment Plan
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Page 13
Table 5-5 - Comparison of Peak Flows
XPSTORM XPSTORM XPSTORM XPSTORM XPSTORM XPSTORM
Catchment A Catchment A Catchment B Catchment B Catchment C Catchment C
ARI Pre- Post- Pre- Post- Pre- Post-
(years) development development development development development development
Flows Flows (Mitigated) Flows Flows (Mitigated) Flows Flows
(m3/s) (m3/s) (m3/s) (m3/s) (m3/s) (m3/s)
1 0.036 0.032 0.058 0.046 0.027 0.016
2 0.043 0.038 0.071 0.056 0.030 0.018
5 0.068 0.052 0.112 0.084 0.041 0.024
10 0.087 0.060 0.142 0.102 0.050 0.027
20 0.107 0.067 0.175 0.120 0.060 0.031
50 0.129 0.084 0.210 0.137 0.070 0.031
100 0.146 0.106 0.240 0.157 0.080 0.031
The XPSTORM hydraulic modelling has demonstrated that the proposed mitigation implemented will
maintain pre-development flows (or less) for all design storms at the LPDs located within Lot 46
and 62 on SP132578, southeast of the site, and Lot 79 on SP138388, northeast of the site. The
modelling has also demonstrated that post-development mitigated flows up to Q20 can be conveyed
through the 225 to 450mm diameter stormwater line traversing the rear of Lots 45, 46 and 62 on
SP132578 and Lots 42-44 on SP144002 and the existing 300mm diameter stormwater line within the
driveway of Lot 79 on SP138388.
Refer to Appendix H for the pre-development XPSTORM results, Appendix I for the post-
development XPSTORM results and Appendix J for the XPSTORM post-development mitigated
results.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 99, 101 & 105 Eumundi Noosa Road, Noosaville
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