Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 93
ITEM
Timestep
COMMENTS/
RECOMMENDATIONS
REVIEW OBSERVATIONS
Timesteps specified in *.tcf and *.ecf files
2D Model timestep = 0.5 seconds.
1D Timestep = 0.5 seconds
2D timestep is within expected range for a 2m grid size.
MODEL CONFIGURATION
Model
Configuration
(1D, 2D or
1D/2D?)
1D/2D with 1D elements including culverts and
stormwater structures
Major culverts and trunk drainage is represented. The full
stormwater network is not included.
May be overestimating flood extent/levels in some urbanised
areas.
2D Grid Size
5 metre grid size
Grid size considered to be too coarse for a detailed overland flood
study. A grid size of 2 metres is recommended with a 1m DEM.
EXTENT OF MODEL
2D
Model
Extent
Active 2D domain extent set by:
