Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 71
Narellan Creek Catchment
Flood Study
the 20% AEP, 5% AEP, 1% AEP and 0.2% AEP design storms under potential future
catchment development conditions.
Table 19
Adopted land use information for cumulative development assessment
Impervious Percentage
Classification
LEP Zone
Current
Adopted Future
Neighbourhood Centre
B1
57
75
Local Centre
B2
74
90
Business Development
B5
77
90
National Parks and Nature Reserves
C1
12
30
Environmental Conservation
C2
19
25
Environmental Living
C4
53
60
General Industrial
IN1
70
90
Light Industrial
IN2
73
90
General Residential
R1
60
70
Low Density Residential
R2
56
65
Medium Density Residential
R3
67
75
Large Lot Residential
R5
20
30
Public Recreation
RE1
29
40
Private Recreation
RE2
7
15
Primary Production
RU1
9
15
Rural Landscape
RU2
12
20
Special Activities
SP1
14
20
Infrastructure
SP2
51
65
The updated design hydrology was applied to the TUFLOW model and the TUFLOW model
was used to simulate each design flood (no modifications were completed to the TUFLOW
model except for the revised hydrology). Flood level difference mapping was then prepared
to quantify the impact that future catchment development is predicted to have on
