Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 105
Frequently Asked
Questions (FAQ)
Why is the 昀氀ood study needed?
Flooding is the most costly form of natural disaster in Australia,
causing an estimated $314 million worth of damage each year.
It is also one of the most manageable natural disasters as we
can reasonably predict which areas it will impact.
During most rainfall events, runo昀昀 is carried by stormwater
systems into various creeks. However, during periods of heavy
rainfall, there is potential for the capacity of the stormwater
system (underground pipes) to be exceeded and lead to
overland 昀氀ooding. Overland 昀氀ooding was recently experienced
across parts of the catchment in February 2020, March 2021,
March 2022, and July 2022.
Overland 昀氀ooding can cut roadways and inundate properties.
This can result in damage to homes, sheds, and businesses,
can place lives at risk and impose a signi昀椀cant 昀椀nancial and
emotional burden on individuals and businesses.
What 昀氀ood studies have
already been prepared?
Camden Council has completed a
range of 昀氀ood-related investigations
including the Updated Narellan Creek
Flood Study (2017) which represented
major trunk drainage pipes. The full
stormwater system was not included
and, as a result, overland 昀氀ooding
was not well represented. Large
areas of the catchment have also
undergone signi昀椀cant development
meaning the previous studies no
longer provide the best possible
understanding of the 昀氀ood risk across
all parts of the catchment.
Learn more, share images or
complete the survey online at
yourvoice.camden.nsw.gov.au
- or scan the QR code.
Who is preparing the study?
Council has engaged specialist 昀氀ooding
consultant, Catchment Simulation Solutions,
to provide an updated and more detailed
understanding of mainstream, overland and
local drainage as well as provide a range of
昀氀ood maps and outputs to assist Council in
better understanding the nature and extent
of the 昀氀ood risk.
What areas does the Narellan
Creek Catchment cover?
Narellan Creek catchment covers an area of
35km² and includes the suburbs of Narellan,
Narellan Vale, Mount Annan and parts of
Harrington Park, Gregory Hills, Kirkham and
Elderslie. The extent of the catchment is
shown in the image below.
The catchment includes Narellan Creek as
well as the following tributaries:
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Oxley Rivulet;
Herbert Rivulet;
Condron Creek;
Campbell Rivulet;
Cross Creek;
Howe Rivulet;
Thornleigh Gully;
Annan Creek; and
Kenny Creek.
