City of Cockburn Coastal Adaptation Plan Presentation to the - - PowerPoint PPT Presentation

City of Cockburn Coastal Adaptation Plan

Presentation to the

CLIMATE CHANGE IN THE SWAN REGION

Forum, Wembley Golf Course, Wednesday 16th November 2016 by Doug Vickery, Manager Infrastructure Services, City of Cockburn

CSCA Area of Interest

Coastline from Fremantle South Mole to Point Peron & east coast of Garden Island

• High value Cockburn Sound & Owen Anchorage coastline - significant current and

proposed development along the coast.

• Consensus that climate change poses a threat through coastal inundation and

erosion, but lack of knowledge regarding local specific vulnerability - require justifiable information for planning decisions.

• Joint funded project brief February 2010.
• MOU signed May 2011 – Agreement to:

a) Build and share knowledge re coastal vulnerability to climate change; b) Assist in the development of strategies to address those vulnerabilities; and c) Enter into partnerships and agreements with other parties in pursuit of (a)&(b)

• Chaired and administrative support by the City of Cockburn

Background to CSCA Formation

State Government Stakeholders Other Stakeholders

Cockburn Sound Coastal Vulnerability & Flexible Adaptation Pathways Project

Preparation Phase (project brief & stakeholders identification) Stage 1 Coastal Vulnerability Study Stage 2 Values & Risk Assessment Stage 3 Flexible Adaptation Plan Development & Review Report Stage 4 Monitoring & Implementation

The Project

Jul’10-Apr’11 Assessed current knowledge / data and Recommended:

• Establish Physical - Sensitivity (Phase I) – What change can be anticipated to occur?

Where? When?

• Assess associated Vulnerability (Phase II) – What impacts can be expected to occur as a

result of this change? Where? When?

• Prioritise Response (Phase III) – What is the importance and urgency of dealing with the

impacts?

• Assign Adaptation Options and Actions (Phase IV) – How will the impacts be addressed

at a range of temporal and spatial scales? – Whole-of-Sound and site specific. What? When? How Much?

• Formulate an Adaptation Implementation Plan – How will the adaptation planning carried
• ut in Phase IV be implemented? By Whom?

Cockburn Sound Coastal Vulnerability & Flexible Adaptation Pathways Project

Preparation Phase (project brief & stakeholders identification) Stage 1 Coastal Vulnerability Study Stage 2 Values & Risk Assessment Stage 3 Flexible Adaptation Plan Development & Review Report Stage 4 Monitoring & Implementation

The Project

June’12- Mar’13

Inundation Hazard – Projected Levels

Storm Event Sea Level Present Day Sea Level +0.5 m SLR Sea Level +0.9 m SLR Sea Level +1.5 m SLR 1 year ARI (63% AEP) 1.00 m AHD 1.50 m AHD 1.90 m AHD 2.50 m AHD 10 year ARI (10% AEP) 1.16 m AHD 1.66 m AHD 2.06 m AHD 2.66 m AHD 100 year ARI (1% AEP) 1.34 m AHD 1.84 m AHD 2.24 m AHD 2.84 m AHD 500 year ARI (0.2% AEP) 1.48 m AHD 1.98 m AHD 2.38 m AHD 2.98 m AHD

Erosion Hazard – Areas at Risk

Existing acute erosion risk

• Garden Island north of Colpoys Point
• Palm Beach, Rockingham
• Kwinana Bulk Terminal

Most severe long-term erosion anticipated

• North of Catherine Point, North Coogee
• Woodman Point areas
• Kwinana Industrial Area to James Point

Increased erosion due to sea level rise anticipated

• South of Catherine Point groyne
• James Point to Kwinana Industrial Area
• South of Garden Island
• South Beach
• Naval Base

‘Stage 1’ - Vulnerability Report Outcomes

Erosion & Inundation Hazard Mapping

Cockburn Sound Coastal Vulnerability & Flexible Adaptation Pathways Project

Preparation Phase (project brief & stakeholders identification) Stage 1 Coastal Vulnerability Study Stage 2 Values & Risk Assessment Stage 3 Flexible Adaptation Plan Development & Review Report Stage 4 Monitoring & Implementation

The Project

Dec’12- Jun’14

Cockburn Sound Coastal Vulnerability & Flexible Adaptation Pathways Project Preparation Phase (project brief & stakeholders identification) Stage 1: Coastal Vulnerability Study Stage 2: Values & Risk Assessment Stage 3: Flexible Adaptation Plan Development & Review Report Stage 4: Monitoring & Implementation

Stage 2 - Values & Risk Assessment 2013/14

• Identified the coastal assets within the areas potentially

affected by the coastal erosion or inundation.

• Estimated the ‘value at risk’ of these assets based on

economic, social/cultural and ecosystem service factors.

• Undertook a risk assessment of the identified threats for

timeframes out to year 2110.

• Provided ‘First pass’ suggested adaptation options and for each

vulnerable section of coast based on Avoid / Accommodate / Protect / Protect & Intensify / Retreat.

• Consultation with Stakeholders other than community.

Cockburn Sound Coastal Vulnerability & Flexible Adaptation Pathways Project

Preparation Phase (project brief & stakeholders identification) Stage 1 Coastal Vulnerability Study Stage 2 Values & Risk Assessment Stage 3 Flexible Adaptation Plan Development & Review Report Stage 4 Monitoring & Implementation

The Project

Jul’14 – Nov’16

Cockburn Sound Coastal Vulnerability & Flexible Adaptation Pathways Project Preparation Phase (project brief & stakeholders identification) Stage 1: Coastal Vulnerability Study Stage 2: Values & Risk Assessment Stage 3: Flexible Adaptation Plan Development & Review Report Stage 4: Monitoring & Implementation

‘Stage 3’ – Report & Coastal Adaptation Plans – Stages:

• Stakeholder & Community consultation
• Compendium of Adaptation options
• Adaptation Plan Report and a Coastal Adaptation Plan for each LGA

Principles :

• Making the right adaptation decision to suit current values and

circumstances without impeding future decision making;

• Adaptation planning should reflect social, environmental and economic

values of the coast;

• Any coastal protection work option should be evaluated based on full life

cycle benefits, costs and impacts.

DECISION POINT (TRIGGER 1) DEVELOPMENT IN VULNERABLE COASTAL AREA

LONG TERM (100 YEAR) PLANNING HORIZON

AVOID & PLANNED RETREAT - STRATEGIC PLANNING TO LOCATE AND RELOCATE LAND USE AND ASSETS OUTSIDE COASTAL RISK AREAS DECISION POINT (TRIGGER 3)

INTOLERABLE RISK ZONE TOLERABLE RISK ZONE

DECISION POINT (TRIGGER 2) DECISION POINT (TRIGGER 4) DECISION POINT (TRIGGER 3)

Adaptation Response Decision Triggers

Stage 3 Cockburn Sound Coastal Adaptation Plan

Decision Triggers

City of Cockburn – Key Adaptation Measures

Coastal Management Unit Coastal Vulnerabilities Immediate Planning Horizon (to 2030) Long-term Planning Horizon (to 2110) CMU 3 – North Coogee Erosion, with intolerable risk presented to assets and a loss of beach area in the immediate planning horizon for some areas, increasing in the lead up to 2070. Interim protection using hard- passive engineering measures in the form of groynes of offshore breakwaters Continued interim protection (using hard-passive engineering measures such as groynes or offshore breakwaters) may be feasible CMU 4 – Port Coogee Inundation, with intolerable risk presented to some assets and a loss of beach area leading up to 2110. Avoid Accommodate Interim protection (using hard-active engineering measures) may be feasible CMU 5 – Coogee Beach Erosion, with intolerable risk presented to assets and a loss of beach area leading up to 2040 Avoid Accommodate Avoid Accommodate Retreat CMU 6 – Woodman Point Reserve Erosion and inundation, with intolerable risk presented to some conservation assets in the immediate planning horizon. Avoid Accommodate Retreat Avoid Accommodate Retreat CMU 7 – Woodman Point Erosion and inundation, with intolerable risk presented to some conservation assets in the immediate planning horizon. Avoid Accommodate Retreat Avoid Accommodate Retreat CMU 8 – Australian Marine Complex Adequately prepared for inundation and erosion events in the short to medium term (up to 2070) Do nothing Monitor Do nothing Monitor CMU 9 – Henderson South Not vulnerable to coastal actions Do nothing Monitor Do nothing Monitor

City of Cockburn – Key Adaptation Measures

• CMU 3 North

Coogee

CMU 4 – Port Coogee CMU 5 – Coogee Beach

CMU 6 – Woodman Point Reserve CMU 7 – Woodman Point

Stage 3 – Conclusions & Recommendations – LGA’s

• Incorporate coastal adaptation planning into the LGA’s Strategic Community Plans - to

provide a local governance framework for integrated decision making in relation to strategic land use, infrastructure and capital works planning.

• The LG’s Local Planning Strategies and Schemes be amended to include the

establishment of Special Control Areas (SCA’s) for the land identified at risk in the period

• ut to 2110 - establishing a long-term intention to retreat in these areas and providing

special planning instruments.

‘Stage 3’ Report – Conclusions & Recommendations – Local Governments

The LG’s prepare Foreshore Management Plans for each area at risk, setting out

the adaptation measures including the land use controls and any interim protection works proposed, for communicating with the community and stakeholders.

Develop a firm plan for interim coastal protection works for those areas at risk

in the current 15 year planning horizon and a provisional plan for protection works thereafter.

Engage with the owners of assets in the SCA concerning plans for interim

protection in the interim period and for development of long-term plans to retreat from the SCA in the lead up to triggers that require such action.

Ongoing monitoring of shoreline change and climate change SLR projections.

‘Stage 3’ Report – Conclusions & Recommendations - State Gov’t

State Gov’t (WAPC) review of the Metropolitan Region Scheme (MRS) and other

strategic land use plans for the coastal strip, to provide adaptation support framework and amendment where needed for land that will be affected in next 15 years;

DoP/WAPC consider amending SPP 2.6 to provide greater policy guidance for

coastal development in areas of risk, in particular coastal nodes and commercial development, which are currently listed as variations to SPP 2.6. Additional policy measures should address potential costs of protection or decommissioning of these variations.

Undertake a study into the long term availability of suitable sand and rock to

meet projected requirements for beach replenishment and coastal protection works (3m M3 & 0.56m M3 respectively).

Cockburn Sound Coastal Vulnerability & Flexible Adaptation Pathways Project

Preparation Phase (project brief & stakeholders identification) Stage 1 Coastal Vulnerability Study Stage 2 Values & Risk Assessment Stage 3 Flexible Adaptation Plan Development & Review Report Stage 4 Monitoring & Implementation

The Project – Cost to Date

Jul’10-Apr’11 $x0k ($xk LGA’s) June’12- Mar’13 $150k ($90k CSCA) Dec’12- Jun’14 $220k ($110k CSCA) Jul’14 – Nov’16 $295k ($145k CSCA) T

• tal Expenditure

T

• Date:

~ $700k

• CSCA ~$370k
• DoT $290k
• DoP $40k

• An alliance approach works - coastal processes and climate change risks don’t

stop at Council boundaries, shared resources enable bigger achievements;

• A staged and iterative approach, refining as we go, has worked for us;
• Who’s coast is it? – it has fallen to Local Government to identify risks and inform
• ur communities, but State and Federal Governments need to play a part.
• Leadership is needed to make it happen;
• Current grant funding (in WA) is not suited to large multi stage/year projects;
• The valuing of coastal assets at threat including beaches and reserves which

invariably have social, cultural and ecosystem importance is not easy;

• Community engagement – problematic to get the balance right – just when, in

what manner and with whom will ensure success ?

• It’s a long haul journey, building and retaining knowledge, experience and

commitment in each Local Government will be a key success factor.

CSCA - Lessons Learned

• NCCARF (National Climate Change Adaptation Forum) CoastAdapt Tool
• Funded by the Federal Government DoE $9m
• Targeted to support Australian Local Governments in Coastal Climate Change

Adaptation

• CoC / CSCA Liaison with NCCARF via:
• CSCA Case Study & video inclusion in CoastAdapt reference material;
• Craig Perry and Doug Vickery participants in the Tool development & End User

Reference Group’s respectively, as WA representatives;

• Dissemination and feedback of the NCCARF activities through our Councils,

Alliances and networks. More Information? - see: https://coastadapt.com.au and www.cockburnsoundcoastalalliance.info

Interface CSCA -