Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 6
EXECUTIVE SUMMARY
Overview
The Narellan Creek catchment covers an area of 36 square kilometres within the Camden
Council Local Government Area (LGA). It incorporates the main watercourse of Narellan
Creek as well as a several smaller tributaries, including:
Kenny Creek
Annan Creek
Thornleigh Gully
Howe Rivulet
Cross Creek
Condron Creek
Herbert Rivulet
Oxley Rivulet
The catchment is mostly urbanised and extends across parts of the suburbs of Narellan,
Narellan Vale, Harrington Park, Currans Hill, Kirkham, Elderslie, and Mount Annan.
During periods of heavy rainfall in the catchment there is potential for water to overtop the
banks of the various creeks and inundate the adjoining floodplain. There is also potential for
overland flooding across the urbanised areas which can occur when the capacity of the local
stormwater system is exceeded, resulting in the excess water travelling along roads and,
potentially, through properties.
In recognition of the potential impact that mainstream and overland flooding may have on
the local community, Camden Council engaged Catchment Simulation Solutions to prepare a
flood study for the Narellan Creek catchment. It documents flood behaviour across the
catchment for a range of historic and design floods. This includes information on flood
discharges, levels, depths and flow velocities. It also provides estimates of the variation in
flood hazard and provides an assessment of the potential impacts of climate change on
existing flood behaviour.
Community Consultation
A questionnaire was distributed to approximately 3,000 properties within the catchment.
The questionnaire aimed to secure information on community flooding experiences, with a
particular focus on information that could be used to assist in the calibration of the
computer flood models that would be developed during later stages of the project. A total
of 45 questionnaire responses were received.
iv
