table of contents - goldcoast.qld.gov.au · 1 introduction ... #1. seawall construction includes...

TRACKS-#40118641-v8-$30_MILLION_PLAN_FOR_SHORELINE_PROTECTION_-_OCEAN_BEACHES_STRATEGY_IMPLEMENTATION_-

_THE_GOLD_COAST_IS_PROTECTED_FROM_EROSION.DOC of 20

Table of contents

1 Introduction.......................................................................................................................................... 5

1.1 The Three point plan for Coastal Protection ............................................................................... 5

1.2 Operational Coastal Program...................................................................................................... 5

1.3 Future Activity.............................................................................................................................. 5

1.4 Finance........................................................................................................................................ 6

1.5 Project Delivery Barchart ............................................................................................................ 7

2 Background.......................................................................................................................................... 8

2.1 Delft Report ................................................................................................................................. 8

2.2 Gold Coast Shoreline Management Plan.................................................................................... 8

2.3 Ocean Beaches Strategy 2013 - 2023........................................................................................ 9

2.4 Strategic Hierarchy for Three Point Plan for Coastal Protection............................................... 10

2.5 Approvals .................................................................................................................................. 11

2.6 Approvals Map .......................................................................................................................... 12

3 Kirra Point Groyne $780,000 .................................................................................................... 13

4 Accelerate Completion of Public Seawalls $10,000,000.............................................................. 13

1 Miami................................................................................................................................................... 13

2 Palm Beach ........................................................................................................................................ 13

3 Broadbeach........................................................................................................................................ 13

4 Main Beach......................................................................................................................................... 13

5 Currumbin .......................................................................................................................................... 13

6 Tugun.................................................................................................................................................. 13

7 Surfers Paradise ................................................................................................................................ 13

7.1 Seawall Design.......................................................................................................................... 14

7.2 Miami Seawall Construction...................................................................................................... 14

8 Northern Beaches Shoreline Project $5,000,000............................................................. 14

8.1 Interim Surfers Paradise Beach Nourishment Project .............................................................. 15

8.2 Mass Nourishment .................................................................................................................... 15

8.3 Bleed valve from seaway pumping jetty.................................................................................... 15

8.4 Backpassing Pipeline ................................................................................................................ 15

8.5 Narrowneck Reef Top Up Campaign ........................................................................................ 15

9 Burleigh to Kurrawa Shoreline Project $15,000,000 ................................................................... 16

10 Operational Coastal Program........................................................................................................... 16

10.1 Accelerate Completion of Private Seawalls $6,000,000 ......................................................... 16

10.2 Currumbin and Tallebudgera Creek Entrance Dredging $845,000pa ............................... 16

10.3 Tweed River Entrance Sand Bypassing Project $5 - 6 million per annum .............................. 16

10.4 Gold Coast Seaway Sand Bypassing System .......................................................................... 17



11 Future Works ..................................................................................................................................... 18

11.1 Palm Beach Shoreline Project $16,900,000 ......................................................................... 18

11.2 Previous and Current Work....................................................................................................... 18

11.3 Concept Design......................................................................................................................... 18

11.4 Detailed design.......................................................................................................................... 19

11.5 Palm Beach Shoreline Project website ..................................................................................... 19



1.4 Finance

Notes

The Kirra Point Groyne will be extended by 30 meters during 2013 as a project fully funded by City of Gold Coast. Council has applied as part of the State government's LGGSP (Local Government Grants and Subsidy Program) for 40% subsidy for extension of the Kirra Point Groyne.

#1. Seawall Construction includes both capital investment into public seawalls and other activity to facilitate the construction of $6 million of private seawalls See section 7.1 of this report for more information about the private seawalls project. The cost to construct private seawalls is the responsibility of beachfront property owners.

#2. The Northern Beaches Shoreline Project will source sand from channel improvements at the Gold Coast Seaway. A $15 million project is planned with $10 million funded by the State Government through the Gold Coast Waterways Authority and $5 million to be funded as part of the 3 Point Plan for Coastal Protection. The overall $15 million Northern Beaches Shoreline Project is proposed to be shared $12.5 million from the State Government and $2.5 million from City of Gold Coast. Note that the final funding share is subject to discussion between Council, the State Government, the Gold Coast Waterways Authority and other key stakeholders. See section 5 of this report for more information. An alternate source of sand is available from reserves off Surfers Paradise beach.

#3 See section 6 for more information about the Burleigh to Kurrawa Shoreline Project.



1.5 Project Delivery Barchart



2 Background

Sustained high energy events experienced since late January 2013 has resulted in significant beach erosion along sections of Gold Coast beaches; particularly that of the central and northern areas. Since the high impact storms of May 2009, Gold Coast beaches have struggled to fully recover with continued battering from consistent high energy swell and storm events.

Risks associated with current budget allocation include restoration and protection efforts being executed over a longer period. This could possibly exacerbate the erosion that exists while perpetuating the current concerns around our world leading beaches and the impacts their condition may have on the tourism industry.

In November 2010, the Gold Coast Shoreline Management Plan (GCSMP) was endorsed by City of Gold Coast (G10.1122.015). This whole of city plan provides for a series of recommendations centred around all facets of coastal management including research and development, policy and strategy and major capital works investment. The recommendations of the GCSMP are reviewed and reprioritised on an annual basis, considering activities undertaken in the former financial year and the beach health condition of individual Gold Coast beaches.

In response to concern about beach erosion, the State Government has requested that Council of the City of Gold Coast present a long term solution for beach erosion. The Three point plan for coastal protection brings forward implementation of the Gold Coast Shoreline Management Plan to ensure the long term future of Gold Coast beaches.

2.1 Delft Report

The 1970 Delft Report recommended a program of major coastal works for Gold Coast beaches including stabilisation and sand bypassing for the entrances at the Gold Coast Seaway and the Tweed River.

An information sheet that summarises the key recommendations from the 1970 Delft Report is available on the City of Gold Coast website at

http://www.goldcoast.qld.gov.au/delft-report-key-recommendations-4524.html

A full copy of the Delft Report is also available at

http://www.goldcoast.qld.gov.au/the-delft-reports-delft-hydraulics-laboratory-netherlands-11014.html

2.2 Gold Coast Shoreline Management Plan

In 2010, Council endorsed the Gold Coast Shoreline Management Plan (GSCMP G10.1122.015) that recommended 77 actions for the management of Gold Coast beaches.

In 2010, the GCSMP identified the following priorities for future capital works investment

1) Palm Beach Shoreline Project 2) Burleigh to Kurrawa Shoreline Project 3) Northern Beaches Shoreline Project



The GCSMP recommends that the health of gold coast beaches be monitored and a reprioritisation of major capital investment be considered each year.

An executive summary of the GCSMP is available on the City of Gold Coast website at http://www.goldcoast.qld.gov.au/gold-coast-shoreline-management-plan-executive-summary-11110.html

A full copy of the GCSMP is also available at

http://www.goldcoast.qld.gov.au/gold-coast-shoreline-management-plan-11012.html

2.3 Ocean Beaches Strategy 2013 - 2023

As part of development of a 2020 vision for the Gold Coast, Council of the City of Gold Coast endorsed five strategies that are to be transformational for the city. The Ocean Beaches Strategy is one of these 5 transformative strategies.

In October 2012, Council endorsed the Draft Ocean Beaches Strategy 2013 - 2023 for public consultation with the following four outcomes (G12.1023.011).

1) Everyone can enjoy a beach experience 2) Our beaches are healthy and clean 3) Our coastal infrastructure is protected from erosion 4) There is joint stewardship of the ocean beaches

In February 2013, City of Gold Coast resolved that the Draft Ocean Beaches Strategy include the development of a surf management plan and a commercial activity plan (ES13.0214.004).

A period of public consultation for the Ocean Beaches Strategy was undertaken from March to May 2013. A report summarising the results of consultation will be presented to the Council of the City of Gold Coast on 23 July 2013 and the Ocean Beaches Strategy will be presented to Council of the City of Gold Coast for endorsement on 20 August 2013.

The Draft Ocean Beaches Strategy 2013 – 2023 is available on the City of Gold Coast website at

http://www.goldcoast.qld.gov.au/ocean-beaches-strategy-15174.html



2.4 Strategic Hierarchy for Three Point Plan for Coastal Protection



2.5 Approvals

The Approvals Map (2.6) shows the network of approved areas along the Gold Coast for dredging and the approved beach areas for sand nourishment. There are sufficient existing approved dredge and nourishment areas to complete the 3 point plan for coastal protection. Additional dredge and nourishment locations will also be pursued, and if these are more suitable, then they may also be utilised as part of the 3 point plan for coastal protection.

Northern Beaches

There is an approved dredge area at the Seaway ebb tide delta. The existing approval is to dredge to -10m. A project to create a channel through the delta will yield at least 750,000 cubic meters of clean sand for beach nourishment. Larger cruise vessels may require additional dredging down to -13 metres and if this occurs, additional sand will be available for beach nourishment.

There is also an approved dredge area off Surfers Paradise Beach.

There are approved beach nourishment areas long the northern beaches from Main Beach to Broadbeach.

Burleigh to Kurrawa

There is an approved dredge area off Burleigh Beach. Investigations are underway to secure additional dredge areas off Miami and Broadbeach. There are approved beach nourishment areas along Burleigh, Miami, Nobby Beach, Mermaid Beach, Kurrawa and Broadbeach.

Palm Beach

There is an approved dredge area off Currumbin. There are approved dredge areas within the estuaries of Tallebudgera and Currumbin Creeks. There is an approved beach nourishment area along Palm Beach.

Southern Points

There is an approved dredge area at the Tweed River Entrance (New South Wales). There are approved beach nourishment areas along southern beaches from Kirra to Snapper Rocks.



2.6 Approvals Map



3 Kirra Point Groyne $780,000

The Kirra Point Groyne will be extended by 30 meters during 2013 as a project fully funded by City of Gold Coast.

Kirra Point Groyne was reduced by 30 meters in length in 1996. A combination of natural coastal processes and nourishment from the Tweed River Entrance Sand Bypassing System has resulted in healthy wide beaches. Surfers have indicated that a restoration of the Kirra Point Groyne to its original length would be beneficial.

A commitment by the Mayor to local interest groups will see the 30 meters of Kirra Point Groyne reinstated during 2013/14 as a project fully funded by City of Gold Coast.

4 Accelerate Completion of Public Seawalls $10,000,000

The Three Point Plan for Coastal Protection proposes that $10 million be spent on completion of public seawalls between 2013 and 2015. A review of the seawall design will be undertaken during 2013.

Seawall Construction includes both capital investment into public seawalls and other activity to facilitate the construction of $6 million of private seawalls See section 7.1 of this report for more information about the private seawalls project. The cost to construct private seawalls is the responsibility of beachfront property owners.

Following early 2013 storms, the completion of public seawalls were prioritised in the following order

1 Miami

2 Palm Beach

3 Broadbeach

4 Main Beach

5 Currumbin

6 Tugun

7 Surfers Paradise

The health of beaches is assessed on a regular basis and this information may lead to a reprioritisation of construction for any remaining public seawalls.



7.1 Seawall Design

7.2 Miami Seawall Construction

Construction of the public seawall at Miami has commenced utilising funding from City of Gold Coast that is currently available . Further information about the Miami Seawall construction project can be found on the project website at http://www.goldcoast.qld.gov.au/miami-boulder-wall-construction-stage-two-15895.html

8 Northern Beaches Shoreline Project $5,000,000

The Three Point Plan for Coastal Protection proposes that $5 million be spent on the Northern Beaches Shoreline Project between 2013 and 2015.

The Northern Beaches Shoreline Project will source sand from channel improvements at the Gold Coast Seaway. A $15 million project is planned with $10 million funded by the State Government through the Gold Coast Waterways Authority and $5 million to be funded as part of the Three Point Plan for Coastal Protection. The overall $15 million Northern Beaches Shoreline Project is proposed to be shared $12.5 million from the State Government and $2.5 million from City of Gold Coast. See section 5 of this report for more information.

The Northern Beaches Shoreline Project area includes Main Beach, Surfers Paradise and Northcliffe Esplanades. The Northern Beaches Shoreline Project will deliver sand nourishment to these beaches. While a partnership with the Gold Coast Waterways Authority for dredging is the preferred option, alternate possible sources of nourishment include dredging of navigation channels, dredging of the seaway ebb tide delta and dredging from the seafloor. It is proposed that profile nourishment be the basis of design for placement onto northern beaches.



8.1 Interim Surfers Paradise Beach Nourishment Project

The Interim Surfers Paradise beach nourishment project will improve the buffer of sand on the beach in front of the Surfers Paradise foreshore redevelopment. This project commenced in April 2013 and will continue until July 2013.

Council has partnered with the Gold Coast Waterways Authority to obtain sand from the Broadwater for the Interim Surfers Paradise Beach Nourishment Project utilising existing funding. The Interim Surfers Paradise Beach Nourishment Project works involve stockpiling 60,000m3 of dredged sand at The Spit.

Once the sand has dried out, up to 20,000m3 will be transported to sites along Surfers Paradise. Sand transport from The Spit to Surfers will be via trucks using on-road and on-beach haulage.

For further information about the Interim Surfers Paradise Beach Nourishment Project see http://www.goldcoast.qld.gov.au/interim-surfers-paradise-beach-nourishment-project--15315.html

8.2 Mass Nourishment

There are a range of potential sand sources for northern beaches including offshore sand reserves, the seaway delta and Broadwater channels. The most likely source of sand for mass nourishment is dredging of the seaway delta. An approval is already in place to dredge to -10m. Potentially 750,000 cubic meters would be obtained by dredging a channel through the delta to -10m AHD.

Future deepening of this channel to -13 metres would provide access for larger vessels and provide additional sand for beach nourishment. Alternate sources of sediment are proven along the seafloor area off northern beaches.

There are approved areas for beach nourishment along Main Beach, Surfers Paradise and the Northcliffe Esplanade.

8.3 Bleed valve from seaway pumping jetty

A bleed valve will allow sand to be backpassed from the Seaway Bypass System to refill an emergency stockpile area on the Spit. The benefits and costs of a bleed valve will be investigated in consultation with the Gold Coast Waterways Authority.

8.4 Backpassing Pipeline

The likely method of dredging sand from the delta for nourishment of northern beaches will involve an ocean going dredge. An alternate method of delivery of sand would involve the construction of a backpassing pipeline from the Seaway to Main Beach, Narrowneck, Cavill Avenue and/or Northcliffe Surf Lifesaving Club.

8.5 Narrowneck Reef Top Up Campaign

An enhancement for the Narrowneck Reef will be considered to stabilise new nourishment as part of the Northern Beaches Shoreline Project. The Narrowneck Reef provides stability for nourished beaches, improves marine habitat and makes a contribution towards surf quality.



9 Burleigh to Kurrawa Shoreline Project $15,000,000

The Three Point Plan for Coastal Protection proposes that $15 million be spent on the Burleigh to Kurrawa Shoreline Project between 2013 and 2015.

The Burleigh to Kurrawa Shoreline Project is a large scale beach nourishment proposal aimed to maintain a healthy beach and to provide an additional sand buffer against storm events. The project includes beach nourishment along erosion hotspots for Burleigh, Miami, Nobbies Beach, Mermaid Beach and Broadbeach Foreshores. There are some known and approved areas of beach sand reserves located nearby to these beaches. Investigations are underway to identify additional sources of sediment for these beaches. It is proposed that profile nourishment be the basis of design for placement onto beaches between Burleigh and Kurrawa.

10 Operational Coastal Program

10.1 Accelerate Completion of Private Seawalls $6,000,000

To complete the Gold Coast Seawall, a project is proposed to facilitate the construction of private seawalls. The target is that another $6 million of private seawalls be completed over the next four years. The cost to construct private seawalls is a responsibility of the adjacent beachfront property owner.

10.2 Currumbin and Tallebudgera Creek Entrance Dredging $845,000pa

Currently, Tallebudgera and Currumbin Creek entrances are dredged on an annual basis between July and September respectively. On average approximately 35,000m3 of sand is dredged from Currumbin and Tallebudgera estuaries and deposited on southern Palm Beach and Burleigh Beach respectively. These dredging campaigns are important in maintaining beach health. The dredging also makes a contribution towards flood mitigation, water quality and navigation.

The dredging works are 100 per cent funded by City of Gold Coast. The estuary areas have been included within the area of responsibility for the Gold Coast Waterways Authority.

10.3 Tweed River Entrance Sand Bypassing Project $5 - 6 million per annum

The beaches at the southern end of the Gold Coast, (Coolangatta through to Currumbin Beach) have held up well during the past four months of high energy events.

The Tweed River Entrance Sand Bypassing Project (TRESBP) is an example of joint stewardship between the New South Wales and Queensland Governments to provide sand for southern Gold Coast beaches (and ultimately the whole of the Gold Coast).

City of Gold Coast provides 50 per cent of the funds that the Queensland Government requires for its partnership with the New South Wales State Government. Further information about TRESBP is available from the project website at http://www.tweedsandbypass.nsw.gov.au



10.4 Gold Coast Seaway Sand Bypassing System

The Queensland Government currently funds the operation of the Gold Coast Seaway Sand Bypassing System. Further information about the Seaway Sand Bypassing System is available at

http://www.griffith.edu.au/__data/assets/pdf_file/0018/322803/Gold-Coast-Seaway.pdf

As part of the Northern Beaches Shoreline Project it is proposed to investigate if a portion of sand from the bypass system can be redirected southwards (backpassing) to nourish northern beaches. See section 5.3 and 5.4 for more information about back passing from the Gold Coast Seaway.



11 Future Works

11.1 Palm Beach Shoreline Project $16,900,000

The Palm Beach Shoreline Project is multi tiered, consisting of several elements that will enhance the future health of Palm Beach. This may include sand dredging and beach nourishment, dune rejuvenation and vegetation works, repair and upgrades of the seawall and possible coastal control structures to maintain beach width and dissipate wave energy during storm events. The PBSP has the following key objectives:

reduce the vulnerability of the beach and beachfront development to storm damage

protect, and if practical enhance the beach amenity for the community

provide a sustainable, cost effective and integrated solution

avoid or mitigate adverse environmental and social impacts.

11.2 Previous and Current Work

Prior to the commencement of the PBSP and during the strategic and forward planning project stages Council has undertaken a series of preliminary investigations, studies and data collection exercises to increase our understanding of various aspects of the Palm Beach foreshore and nearshore zone. These include:

appointment of subject matter experts

coastal Modelling Investigations

ecological Inventory

hydrographic and geophysical surveys

social and economic impact assessment

communication and engagement plan

Palm Beach Feasibility Study.

These investigations and studies are being utilised and assist in various aspects of the project development and provide valuable information resources for stakeholders and the public.

11.3 Concept Design

DHI Water & Environment have been appointed by Council to undertake the concept design. The design will be derived by conducing an assessment of two management schemes developed from the Palm Beach Feasibility Study (Management Scheme’s D and F) and a viable alternative solution.

The purpose of the concept design and report is to lead in to detailed design and provide the basis for submitting approvals with the Department for Environment and Heritage Protection (DEHP). The concept design report and drawings will also be presented to key stakeholder groups and graphical outputs will be required for presentation purposes.



11.4 Detailed design

A detailed design will be developed from the concept design, this will include construction, drawings, specification and contracts. Depending on the outcome of the concept design the delivery of the detailed design also includes allowances for numerical and physical modelling components. The following activities will also be undertaken in conjunction with the delivery of the detailed design:

detailed design drawings and brief will be submitted to supplement the concept design report and drawings and finalise the DEHP approvals.

hydrographic and Terrestrial Survey

expressions of interest for dredging contractor

community consultation

vegetation management plan

ecological inventory – Stage 2

.

11.5 Palm Beach Shoreline Project website

Further information about the Palm Beach Shoreline Project is available on the project website at http://www.goldcoast.qld.gov.au/palmbeach

AGE 20

20

table of contents - goldcoast.qld.gov.au · 1 introduction ... #1. seawall construction includes...

Documents