Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 73
Narellan Creek Catchment
Flood Study
A significant number of roads and properties in the lower catchment are also predicted to
be exposed to significant inundation depths, however, this is driven by Nepean River levels
rather than local catchment runoff.
During extreme floods (i.e., the PMF), nearly 1,400 road segments would be cut. This
includes 508 road segments inundated with more than 0.5 metres of water and 336 road
segments inundated with more than 1 metre of water. This would result in floodwater
extending well beyond the road reserve in many areas resulting in inundation of adjoining
properties.
Depths or more than 1.5 metres are predicted around the Mount Annan Marketplace at the
peak PMF. Likewise, depths of well over 1 metre are predicted around the Narellan Town
Centre. This would likely place a significant number of staff and patrons at risk in these busy
commercial precincts.
Many of the overland flowpaths discussed above would experience significant inundation
depths during the PMF and many other flowpaths would begin to form. Or particular note
are the following areas where water depths of more than 1 metre are predicted across
multiple residential properties:
Narellan Road to Currans Hill Drive, Currans Hill
Wandarrah Reserve to, Mount Annan
Woodland Crescent to Camden Bypass, Narellan
Liquidamber Drive to Narellan Road, Narellan Vale
Fairwater Drive and OMeally Place, Harrington Park
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