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8. Volume 5 - Stormwater Management Plan
Attached to the e-mail MCU16/0084 & OPW16/0157 Development Application - Traffic Impact Assessment & Stormwater Management Plan (email 3 of 3).
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Log in to see the plans as drawn LAMBERT & REHBEIN
ENGINEERS • MANAGERS • SCIENTISTS
Table 3 Pre Development Peak Flow Rates
ARI (Years) Rational Method (m3/s) XPStorm (m3/s) Difference (m3/s) Difference (%)
Q1 0.051 0.047 - 0.004 - 8%
Q2 0.069 0.079 + 0.010 + 15%
Q5 0.095 0.112 + 0.017 + 18%
Q10 0.111 0.128 + 0.017 + 16%
Q20 0.132 0.150 + 0.018 + 14%
Q50 0.167 0.162 - 0.005 - 3%
Q100 0.191 0.180 - 0.011 - 6%
The order of magnitude of the XPStorm Model results correlate reasonably well for all intensity
events when compared with the rational method calculations. As such, the XPStorm Model is
considered to be satisfactory for this investigation.
3.4 POST DEVELOPMENT SCENARIO
Table 4 overleaf outlines the calculations, methodology and inputs used to undertake the post
development hydrologic modelling in XPStorm.
Ref: B16239CR002 - 5 - Stormwater Management Plan
Noosa Energy Centre - Noosaville
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