2 David Low Way - Attachment 4 - Specific Engineering Assessments - Cardno 10-8-17

Table 1-2 Met-Ocean Input for Storm Erosion Analyses at Castaways Beach

 

 

 

 

 

 

 

 

Component 100-Years ARI Value
Significant Wave Height 9.64m
Peak Wave Period 16s
Storm Tide Level 2.44m AHD
1.2.3 EPAW Calculation

Based on the analyses described herein, the calculation of the EPAW was taken to be:-
E=[(NxR)+C +S] x (1+F)+D

= [(83x0) + 32 + 23] x (1.4)

=77m

According to the Queensland Coastal hazard Guidelines, this calculated EAWP is to be set back from
the seaward toe of the frontal dune at the site. The seaward toe of the frontal dune is normally
approximated by the seaward limit of terrestrial vegetation or, where this cannot be determined, the
level of present day HAT. 'Present day HAT' in the definition is always taken to be the present day level
of HAT for the coastline as defined in the Queensland Tide Tables for that year, or as defined by
empirical methodology at the site. In this way the landward boundary of the erosion prone area defined
above will continue to move landward over time as sea level rises in the future.