Narellan Creek Overland Flood Study (Vol 1) - Flipbook - Page 41
Narellan Creek Catchment
Flood Study
Pit exit loss.
The extent of the stormwater system included within the TUFLOW model is shown in
Figure 7.
Blockage
Like bridges and culverts, stormwater inlets can become partially blocked during significant
rainfall events because of urban debris being mobilised by runoff. To account for the
reduced inlet capacity that is afforded by blockage, blockage factors were applied to all
stormwater pits in the TUFLOW model. This included a 20% blockage factor for
