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2021-11-15 GC Agenda - Item 7 - Attachment 1 - Coastal Hazards Adaptation Plan
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At present, the only methods for mitigating coastal erosion risks in Marcus Beach and Castaways
Beach are:
- Maintaining and enhancing vegetated dune areas, which act as a natural buffer to erosion by
dispersing wave energy during storm events
- Planning controls on coastal development that prevent encroachment into the vegetated dune
areas, thereby preserving natural coastal processes of erosion and accretion.
Adaptation outcomes and associated actions for Marcus Beach and Castaways Beach
The assessment of erosion risks in Marcus Beach and Castaways Beach show the level of risk to
The assessment of erosion risks in Marcus Beach and Castaways Beach show the level of risk to
most assets is acceptable, however the risk to a section of David Low Way may become intolerable
most assets is acceptable, however the risk to a section of David Low Way may become
byintolerable
the year 2070.
by theTherefore,
year 2070.theTherefore,
most suitable adaptation
the most pathway
suitable for this
adaptation locality
pathway foristhis
onelocality
that supports
is
the
oneprovision of accessibility
that supports to residential
the provision communities
of accessibility currently
to residential dependent
communities on David
currently Low Way.on
dependent
AsDavid Lowthe
a result, Way.
preferred adaptation outcomes for this locality are:
As-
a Implement measuresadaptation
result, the preferred that support and enhance
outcomes for thisdunes,
localitybeach
are: health and natural coastal
processes as soon as possible
- Prevent
- Implement measures that
the construction support
of hard and enhance
protective structuresdunes,wherebeachpossiblehealththatandare natural
likely coastal
to
processes as soon as possible
exacerbate erosion risk, impact on preferred outcomes for dune and beach health, impair
- Prevent the construction of hard protective structures where possible that are likely to
natural coastal processes, and lead to adverse impacts on neighbouring areas
exacerbate erosion risk, impact on preferred outcomes for dune and beach health, impair
- Seek to accommodate
natural coastal processes,the riskand
to major
lead toinfrastructure
adverse impacts (i.e. David Low Way) through
on neighbouring areas adaptive
- design
Seekintoorder
accommodate
to increase the risk to major
resilience duringinfrastructure
a major erosion throughevent, (i.e.and
David Low continued
ensure Way)
adaptive design
functionality post-event in order to increase resilience during a major erosion event, and ensure
continued functionality post-event.
Figure 13 shows the expected progression of these preferred outcomes between 2020 and 2100.
Table 7 provides
Figure 13 shows a the
breakdown
expectedofprogression
actions in of these preferred outcomes between 2020 and 2100.
Pathways Map Legend
support
Table 7ofprovides
these outcomes,
a breakdown to beofpursued
actions in support of Trigger
thesepoints
outcomes,
(points in time to be pursued
for when within
a decision needs the
to be made)
within the five-year
five year lifeplan.
life of this of this plan. Commencement or future commencement of adaptation option
Active action on this adaptation pathway
Effectiveness of this option may be reduced and require reassessment
Figure 13 - Preferred long-term adaptation pathway response to projected coastal erosion risks in Marcus Beach and
Figure 13 - Preferred long-term adaptation pathway response
Castaways to projected coastal erosion risks in Marcus Beach
Beach
and Castaways Beach
Page 48
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