Response to Information Request 10-6-2025 Overland Flow Assessment · OPW25/0042

FIGURE 2.5: FREEBOARD ASSESSMENT

2.2.1.3 Channel and Culvert Scour Protection
The maximum velocity in the proposed culvert outlet is 2.10 m/s. As such, scour protection is recommended in accordance with the
Queensland Urban Drainage Manual. This guideline recommends rock size D50 = 200mm and extend 3.6m past the outlet.
Velocities within the flow path are generally less than 2.0m/s, however, there a section between the foot bridge and Serenity Close, where
the velocities are up to 2.30 m/s. It is recommended that reinforced turf is considered in this section of the channel (approx. CH150 to 170).




NOOSA CALILE I BBNE01676-0001-REP-001-1                                                                                                    12