Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 50
Narellan Creek Catchment
Flood Study
4.4.2
TUFLOW Modelling
Boundary Conditions
Discharge hydrographs generated by the WBNM hydrologic model were used to define
inflows to the TUFLOW model.
The downstream boundary condition for the TUFLOW model was defined based on
recorded water levels at the Camden Weir stream gauge for the July 2022 event. This was
incorporated into the TUFLOW model as a time varying water level for the Nepean River.
Blockage
As the June 2022 rainfall was generally less than a 5% AEP event, the design blockage factors
were assigned based on this frequency (i.e., third last column in Appendix D).
For stormwater pits, a 20% blockage factor was applied to
