Coastal Erosion Areas - Mercury Bay

This page gives a breakdown of fragile coastal areas in Mercury Bay including the Whitianga beachfront and what coastal protection work is being looked at in these areas.

The area covered by both the Programme and Action Plan is the area of the Mercury Bay CommunityBoard of Thames Coromandel District Council. The coastal part of this stretches from Hot Water Beach in the south to Whangapoua Beach in the north

Hot Water Beach

a) Implement a dune planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme. 

 


 

Hahei Beach

a)Implement a dune planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme.

 


 

Cooks Beach - Purangi End

a) Implement a dune restoration and planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme.

c) Obtain resource consent for the development of a hard structure in a location that protects the pump station and roading infrastructure, such wall to be constructed only in the event that the extent of erosion causes a threat that infrastructure. 

Cooks Beach - Home Owners Wall

Cooks Beach _Coromandel Peninsula

a) Implement a dune restoration and planting programme along the front of the existing rock wall.

b) Establish with the owners of the home owners' wall a Community Beach Care Group to work in partnership with the Community Board to implement the programme.

In August 2012 all affected property owners (including our Council)  reached an agreement to pay for a new coastal defence structure. A steering committee was set up and a few months later a memorandum of understanding was signed where everyone contributed funds towards appointing an engineer. In 2013 the Cooks Beach Wall Trust was established, a resource consent was approved and a 474m backstop wall was completed at the end of 2013. In June 2014 a severe storm caused further erosion so Council approved $358,340 funding to carry out design and resource consenting for an extension of the Cooks Beach Wall. The project involves extending the recently completed private wall in front of the houses by a further 140m south tio extend the protection provided by the wall, from the last house adjacent the Purangi Reserve to past the newly relocated Cooks Monument. As pre-consent process continues, we're continually reviewing and looking at our Coastal Erosion Management Strategy and assessments around soft verses hard options for coastal protection and restoration. 


Flaxmill Bay

Extensive work has been undertaken by a resident/property owner from the area with a range of coastal experts and in consultation with the Mercury Bay Community Board and the Waikato Regional Council. The proposal is to acquire land from the property owners on the landward side of Purangi Road for the purpose of widening the road and negating any need for a hard structure. It also proposed that no hard structure be built in this locality but that if one was to be built then a vertical wooden wall was favoured.

The following is the action to be taken:

a) Obtain resource consent for construction of a rock wall for a length of approximately 75 metres at the point where the erosion is directly threatening Purangi Road.

b) Implement a dune restoration and planting programme for the whole length of Flaxmill Bay.

c) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme.


Front Beach

a) Implement a dune restoration and planting programme for the whole length of Front Beach.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme.



Whitianga

Whitianga Waterways Channel to Whitianga Marina 

Sand replenishment along the Robinson Rd estuarly foreshore. The possibility of sand coming from the Whitianga Waterways from 2015 onwards through dredging.

Buffalo Beach - Wharf to Albert St

a) Implement a dune restoration and planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme.

Buffa;p Beach_Coromandel Peninsula

Buffalo Beach - Albert St to Halligan St.

a) Implement a dune restoration and planting programme along the front of the existing rock wall.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme.

Back in 2012 there was severe erosion around the toilet block due to a strong storm which saw the sea within a metre or so of breaking through to the road and carpark.Then in In June 2014 another severe weather event caused erosion between the end of the newly finished rock wall to the Buffalo Memorial. Construction of the rock seawall extension at Buffalo Beach was completed by the end of June 2015. The rock seawall will protect the road, residential properties and the reserve on Buffalo Beach Road from coastal erosion.The wall is 115m long and cost $375,000. Meanwhile in our 2015-2025 Long Term Plan we have $520,000 set aside to provide further protection at the end of the wall currently being built, to the dune planting area.

We were extremely fortunate to have artist Michael Smither contribute to the design of the footpath with his stingray designs which are embedded in the concrete,

In October 2015 the Mercury Bay Community Board agreed to the trial of a wooden groyne at the already completed Stage 2 rock seawall.

During this time a study being conducted by Waikato University on Mercury Bay/Whitianga Harbour delta hydrodynamic research will also be complete, which will also help inform a decision in the long-term.

It’s expected the groyne will promote enough sand build-up towards the north of Buffalo Beach to negate the construction of a further rock seawall as well as allow for more dune planting.

The structure will be designed to allow for pedestrian access, so people can still walk along the beach unimpeded.Stage Two construction of the Buffalo Beach rock seawall was completed earlier in 2015 between the public toilets and the Buffalo Memorial site. There is resource consent on hand for Stage 3 of a rock seawall, which could extend the wall further if required.

Buffalo Beach - Halligan St to Taputapuatea Stream

a) Consolidate and improve the existing dune restoration and planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme. 

 A dune rehabilitation project started in this section and so far more than 10,000 dune plants has helped restore 170m of dune. The project hopes to demonstrate this option of working with nature to re-establish functioning dunes as a coastal protection measure.

Taputapuatea Stream to Mercury Bay Boating Club and Homeowners Wall

a) Work with the Royal Forest and Bird Protection Society to complete implementation of the Taputapuatea Spit Restoration Project and in conjunction with this implement a dune restoration and planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme.

Buffalo Beach Homeowners Association Seawall. (Area E)

a) Work with the home owners to implement a dune restoration and planting programme along the front of the existing rock wall.

b) Establish with the owners of the home owners' wall a Community Beach Care Group to work in partnership with the Community Board to implement the programme. 

Property owners proceeded without resource or landowner (Council) consent to establish a coastal protection structure (since granted a temporary resource consent) on public reserve land to protect private property values.  The seawall seriously compromised public beach values and aggravated erosion of adjacent private and public land. In August 2012 there was sand 'push ups' done along the beach. Discussions withi the homeowners will continue with everyone now working at looking at how to best resolve this situation.

Buffalo Beach - End of Home Owners Wall to Te Waiti Stream - Ohuka (Macrocarpa) Reserve. 

a) Implement a dune restoration and planting programme from the end of the home owners wall to the Te Waiti stream including the area in front of the existing Council owned rock wall.

b) Obtain resource consent and construct a groyne to control the discharge from the Te Waiti Stream in a manner that prevents it from causing erosion along the beach front.

c) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme. 


Brophy's Beach

a) Consolidate and improve the existing dune restoration and planting programme on top of and along the front of the existing geotech sand bag wall.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme. In 2015 a geosynthetic container (sandbag) backstop wall was installed at 530m long and a cost of $862,000.It also saw the realignment of the wastewater pipeline. A sand bag wall is appropriate here because the sea conditions are conducive to this style of backstop erosion protection and aren’t as severe as at Buffalo Beach plus there’s a greater distance of sand dune between the beach, the road and private properties,


Wharekaho (Simpson's) Beach

a) Implement a dune restoration and planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme. 


Opito Beach. 

a) Implement a dune restoration and planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme.


Otama Beach

a) Implement a dune restoration and planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme.


Kuaotunu Beach

a) Implement a dune restoration and planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board  to implement the programme.


Grey's Beach

a) Implement a dune restoration and planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme.


Rings Beach

a) Implement a dune restoration and planting programme.

b) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme. 


Matarangi

a) Implement a dune restoration and planting programme.

a) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme. 


Whangapoua

a) Implement a dune restoration and planting programme.

a) Establish a Community Beach Care Group to work in partnership with the Community Board to implement the programme. 

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