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Engineering_Integrated Water Management Plan
Plans and drawings
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Log in to see the plans as drawnA comparison of peak Rational Method flow rates compared with peak WBNM
model flow rates are provide in Table 16 below.
Table 16: Rational Method Peak Flows Versus WBNM Peak Flows
ARI Rational Method WBNM Difference
(Years) m3/s m3/s (%)
2 0.64 0.73 12.3
10 1.02 1.01 0.1
100 1.76 1.40 -25.6
The above results show that a reasonable peak flow calibration has been achieved
for the 2 and 10 year events of the WBNM model when compared to a Rational
Method calculation. The WBNM model produces a lower peak in the 100 year event
however, this would be considered conservative when assessing non-worsening of
flows.
16
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