Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 72
Narellan Creek Catchment
Flood Study
5.7
Discussion on Flood Behaviour
The flood mapping shows that during more frequent floods (e.g., up to and including the
10% AEP event), overland flooding is characterised by shallow water depths that are mostly
contained to roads. Although the water depths are generally less than 0.2 metres during
the more frequent floods, some areas are predicted to experience inundation depths of
more than 0.5 metres during the 10% AEP flood. This includes:
Camden Valley Way (near Narellan Town Centre)
Rear of properties located at Woodland Crescent, Narellan
Waterwork Drive, Narellan Vale (adjacent to Nugget Beames Reserve)
Anderson Road, Smeaton Grange (west of Dunn Road)
Although most water is contained to the road network during the frequent design floods, an
overland flow path through several properties is evident between Queen Street and Wilton
Street at Narellan.
During moderate to larger floods (i.e., up to and including the 1% AEP event), water depths
along roads become more significant. A significant number of roads (i.e., 165 road
segments) are predicted to experience water depths of at least 0.3 metres at the peak of
the1% AEP flood, which would typically be sufficient to prevent vehicular movement. The
following additional areas would be subject to at least 0.5 metres depth of water during the
1% AEP flood:
Narellan Road (between The Old Northern Road and Camden Valley Way)
The Old Northern Road (near Narellan Town Centre)
Fishburn Place, Narellan
Peppercorn Avenue, Narellan
Welling Drive, Mount Annan (near Wandarrah Reserve)
Henrietta Drive, Narellan Vale (south of Welling Drive)
Avery Way, Narellan Vale
Paddy Miller Avenue, Currans Hill
Manchester Way, Currans Hill
Vulcan Way, Currans Hill
Dunn Road, Smeaton Grange (north of Anderson Road)
Some additional overland flow paths also form through properties during the 1% AEP flood.
The most significant flow paths include:
Farmhouse Place, Currans Hill
Eastlewood Street to Narellan Road, Narellan
Peppercorn Avenue to Richards Road, Narellan
Tobruk Road to Montgomery Circuit, Narellan Vale
Welling Drive to Pearce Place, Narellan Vale
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