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Site Based Stormwater Management Plan
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Plans and drawings
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Log in to see the plans as drawn4.7 Stormwater Detention Results
Table 4.7 presents the results from the XPSTORM detention basin model compared against
the pre-developed Rational Method results from Section 4.3.
Peak Discharge Comparison (m3/sec)
Post-Developed
Design Storm Existing Difference % Change
Mitigated
(AEP)
63% 0.089 0.056 -0.033 -37%
39% 0.114 0.112 -0.002 -2%
18% 0.158 0.157 -0.001 -1%
10% 0.198 0.178 -0.020 -10%
5% 0.236 0.201 -0.035 -15%
2% 0.301 0.199 -0.102 -34%
1% 0.346 0.217 -0.129 -37%
Table 4.7 Pre-Development v Mitigated Post-Development Peak Stormwater Discharge
The detention basin outcome satisfies Acceptable Outcome AO2.3 from the Noosa Plan
(2020), by demonstrating post-development flow rate characteristics are equal to or less
than the pre-development case. This outcome ensures non-worsening of peak stormwater
flow discharging from the proposed development.
Site Based Stormwater Management Plan Page 9 of 19
2123-SBSMP-01_Version 1.0 (October 2021)
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