Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 94
ITEM
Supplementary
data
(e.g.,
additional
survey data
acquired for
the project,
changes to
terrain due to
roadworks,
development,
etc)
REVIEW OBSERVATIONS
COMMENTS/
RECOMMENDATIONS
2d_zsh layer included to enforce natural low points for
flow paths and small creeks
2d_zsh layers included to for various basins throughout
the study area
2d_zsh layers should be retained in the model as the
2023 LiDAR is found to be consistently higher than the
surveyed elevation throughout areas with water bodies,
indicating inaccurate ground elevations due to TINing
across the water surface.
2d_zsh_MHL_terraincorrections_002 do not align well with 2023
LiDAR, refinement of Z shapes is required to represent the
channels appropriately.
Improved
definition of
gullies and
ridges
Review LiDAR across vegetated channels. If channels are not
captured well, detailed channel survey should be requested to
collect terrain elevations that can be implemented in the model
topography using 2d_zsh.
