Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 28
Narellan Creek Catchment
Flood Study
Plate 4
Example of original (top image) and updated (lower image) stormwater profile
2.5.2
Land Use
A copy of the Camden Local Environmental Plan (LEP) Land Use zones are shown in Plate 5.
It shows that most of the study area comprises low-density residential zoning (R2 zone).
Several recreation/open space zones are also scattered across the catchment and are
generally aligned with creeks and other water features. A large industrial area also extends
across most of Smeaton Grange and smaller business/commercial areas are centred around
the Narellan Town Centre and Mount Annan. Much of the downstream sections of the
catchment (i.e., between The Northern Road and Nepean River) are zoned as primary
production (RU1 zone)
Remote Sensing Data
Land use mapping was prepared as part of the TUFLOW model that was previously
developed for the Narellan Creek catchment. Much of this information is considered
appropriate for application in defining land use and associated roughness coefficients in the
updated hydraulic model for the current study. However, as noted in Appendix A, additional
detail is required across the urbanised sections of the catchment to provide an improved
description of hydraulic roughness and key overland flow impediments such as buildings.
In this regard, remote sensing analysis was completed using the LiDAR information
described in Section 2.4.1. This included delineation of roads, concrete, water as well as low
and high revegetation (e.g., shrubs and trees respectively). Building footprints were also
provided as part of the LiDAR survey package for inclusion in the updated land use map
which is shown in Figure 5.
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