Appendix I Intersection Flood Hazard Assessment - 2 of 2 · RAL25/0004

                                                                                       Flood Hazard Assessment
                                                              Intersection of Lake Macdonald Dr and Dianella Crt



8        SUMMARY OF FINDINGS
Detailed flood modelling of the catchment and subject intersection has demonstrated the capacity
of the existing culverts provides 10% AEP design flood immunity to the intersection. For larger and
rarer flood events of less than 2% AEP the model results show the intersection will experience water
over the road to depths of less 0.3 m for a 1% AEP flood event for relatively short durations of less
than 1.5 hours.

The flood modelling has also demonstrated that should a significant blockage of the culverts occur
during a major rainfall flood event the depths of inundation across the culvert would not be
expected to significantly change, however, the inundation may persist for longer periods.




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