Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 13
Narellan Creek Catchment
Flood Study
LIST OF TABLES
Table 1
Available rain gauges in the vicinity of the Narellan Creek catchment ..................6
Table 2
Available Flood Marks..........................................................................................7
Table 3
Available LiDAR Datasets ....................................................................................8
Table 4
LiDAR versus ground survey elevation differences. .............................................8
Table 5
Adopted Impervious Percentage for Hydrologic Model .......................................20
Table 6
Adopted stream lag factors ................................................................................21
Table 7
TUFLOW Roughness Coefficients .....................................................................24
Table 8
Historic Rainfall Statistics ...................................................................................29
Table 9
Comparison between simulated and surveyed flood levels the June 2016 flood 32
Table 10
Comparison between simulated and surveyed flood levels the March 2022 flood
..........................................................................................................................34
Table 11
Comparison between simulated and surveyed flood levels the March 2022 flood
..........................................................................................................................36
Table 12
Adopted Burst Rainfall Losses for Pervious Surfaces ........................................40
Table 13
Adopted temporal patterns and storm durations for hydraulic analysis ...............43
Table 14
Adopted Nepean River Boundary Conditions .....................................................44
Table 15
Qualitative and Quantitative Criteria for Hydraulic Categories ............................50
Table 16
Residential Flood Damage Summary .................................................................52
Table 17
Commercial Flood Damage Summary ...............................................................53
Table 18
Summary of Total Flood Damage Costs for Existing Conditions ........................54
Table 19
Adopted land use information for cumulative development assessment.............57
Table 20
Flood Planning Constraint Categories (AIDR, 2017) ..........................................71
Table 21
Floodplain Risk Precinct Definitions ...................................................................73
LIST OF PLATES
Plate 1
LiDAR ground points in the vicinity of Fairwater Drive, Harrington Park .............10
Plate 2
LiDAR ground point density for Narellan Creek catchment.................................11
Plate 3
LiDAR ground point density near Fairwater Drive, Harrington Park ....................11
Plate 4
Example of original (top image) and updated (lower image) stormwater profile ..14
Plate 5
Local Environmental Plan 2010 zones ...............................................................15
Plate 6
Welling Drive, Mount Annan during 2016 flood ..................................................17
Plate 7
View looking south east from The Outlook, Kirkham during March 2022 flood ...17
Plate 8
Rear of Horseman Place, Currans Hill properties during June 2016 Flood .........18
Plate 9
Conceptual representation of buildings in TUFLOW model ................................25
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