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Stormwater Management Plan
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Log in to see the plans as drawn65-67 Elanda Street, Sunshine Beach
Site Based Stormwater Management Plan
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Table 3.4 Peak flow results from Rational Method
Storm event Peak Flow Pre- Peak Flow Post- Difference Difference
development development (m3/s) (L/s)
3 3
(m /s) (m /s)
63% AEP 0.018 0.023 0.005 5
39% AEP 0.022 0.027 0.005 5
20% AEP 0.033 0.041 0.009 9
10% AEP 0.041 0.051 0.011 11
5% AEP 0.048 0.061 0.013 13
2% AEP 0.061 0.078 0.017 17
1% AEP 0.070 0.089 0.019 19
Table 3.5 Peak flow results from Rational Method with 20% increase in rainfall intensity
Storm event Peak Flow Pre- Peak Flow Post- Difference Difference
development development (m3/s) (L/s)
3 3
(m /s) (m /s)
63% AEP 0.022 0.027 0.005 5
39% AEP 0.026 0.033 0.007 7
20% AEP 0.040 0.050 0.010 10
10% AEP 0.049 0.061 0.013 13
5% AEP 0.058 0.074 0.015 15
2% AEP 0.074 0.094 0.020 20
1% AEP 0.087 0.107 0.023 23
It must be noted that the XPSTORM numerical model and Rational Method are different
methods in nature. Rational method is a mathematical model, which is only recommended
to provide general storm peak discharge without the capacity of considering the infiltration
and runoff storage. Whereas the XPSTORM model is a hydrological model based on runoff
routing technique considering the necessary infiltration and site-specified design storm
File Name: WCD-22936 – 65-67 Elanda_SWMP.docx
Revision: C 13
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