News

Widening breach (August 17th)
Over the last 3 months the breach has grown and the levee bank is rapidly eroding.

July 25, 2016
More high tides and storms in the last week are further eroding the western levee bank and there’s ponding by the southern boundary and over the northern levee bank.

July 13, 2016
Front page coverage
The Portside Messenger this week covered the story and responses to the flooding of Mutton Cove.

June 29th, 2016
Letter to Editor, Portside Messenger
A letter about Mutton Cove from Tony Bazeley, President, Port Adelaide Residents Environment Protection Group was published on pp10.

June 23rd, 2016
With fortnightly high tides since the levee bank breach, there has been recent widespread flooding of the Reserve.

May 30th, 2016
It’s now 3 weeks since the Port River broke the levee bank and the conservation park flooded in major weather event. See how Mutton Cove is evolving.

May 10th, 2016
The Port River broke the levee bank and the conservation park flooded in major weather event yesterday afternoon. Photos and more information here.

January 26th, 2016
Look out for migratory birds including this Greenshank photographed on Australia Day

26.1.16

26.1.16

November 22nd, 2015
Brown snakes are out and about so do take care.

Brown snake (approx 1.5m long) and its tiny prey

October 25th, 2015
Community members are seeking for DEWNR to approve a means of preventing the Port River breaching the levee bank at Mutton Cove and for private sector companies to assist in sponsoring the agreed solution. As outlined below a Living Shorelines approach has community appeal and might include seawall patching, inwall planting (e.g. mangroves) and an intertidal native oyster reef.

A report, commissioned by Adelaide and Mt Lofty Natural Resources Management Board and prepared by Peri Coleman, has now been released that examines the causes of mangrove erosion along the Port River and the potential for mangrove restoration.

The report says:
The specific rationale for restoring or replanting mangroves in the Port River Barker Inlet estuary is that they can buffer existing coastal protection structures such as seawalls…Developing ways to encourage mangrove growth along the seawall at Mutton Cove is likely to reduce the requirement for regular maintenance of that seawall.

September 11th, 2015
Red-necked stints feeding at Mutton Cove this morning; first seen this season.

Red-necked Stint 9372-2

 

July 1st, 2015
Could a ‘Living Shoreline’ protect Mutton Cove?

Peri Coleman of Delta Environmental Consulting made a presentation on Living Shorelines to the Port Adelaide Environment Forum  on June 18th and residents were excited by the prospect that a Living Shorelines approach could provide a possible cost effective means of protecting the levee bank from being breached by the Port River. This would prevent the loss/drowning of the saltmarsh and re-establish access along the bank.

Breach of levee bank - at low tide

Breach of levee bank – at low tide 21.6.15

A Living Shorelines approach at Mutton Cove would involve the patching of the levee bank and provision of sill or toe protection for the existing mangroves and possibly also trialling the establishment of a native oyster reef that could lessen the impact of wave action on the mangroves that protect the bank. (Left click on this diagram to enlarge)

Potential Living Shorelines approaches across differenet zones at Mutton Cove

Living Shorelines are being established in USA and trialed in Port Phillip Bay, Melbourne and offer the prospect of protection along the riverfront more broadly to address sea level rise. Since 1995 there’s been a 10 cm rise along the riverfront and obviously there will be more.

April 1st, 2015
The Adelaide and Mt Lofty Natural Resources Management Board considered this report Mutton Cove_Levee Risk Assessment at its meeting on March 26th 2015.

The report indicates that:

  • Mutton Cove retains the last vestiges of the back barrier saltmarshes along the Port River edge of the LeFevre Peninsula. The Metropolitan Adelaide and Northern Coastal Action Plan identifies Mutton Cove as a significant, partly rehabilitated, remnant mangrove and saltmarsh. Maintenance of the levee is identified as a high priority conservation action (Caton et al, 2009).
  • The use of either preventative maintenance (levee inspections and rocking of vulnerable areas) or rapid mitigation after any breaches occurred would reduce all the risks considerably.
  • As at March 2015, the Minister is supporting the Department of Environment, Water and Natural Resources position to not repair or replace the levee. This is based on the cost of such repairs and that the environmental changes are acceptable, with the environment expected to shift from a samphire dominated to mangrove dominated system.
  • The NRM Board does not have any responsibility or authority in relation to the levee at Mutton Cove.

One thought on “News

  1. Re- Final development phase of Mutton Cove the consolidation of interdepartmental boundaries affected parties and priorities.
    Protect existing infrastructure ie. electricity substation and pylon access from flood tides.
    Notify Minister- Existing water delivery system to mutton cove (pipes) unsuitable -The concentrated water flow is depositing large amounts of silt into the shipping channel and the submarine berth immediate attention is required before the option of expensive dredging is necessary.
    Possible Mitigation Steps :
    1. Raise southern walking path to above floodtide level and northwest corner access path to shipwreck.
    2. Fill southern boundary to create a new planting area for environmental groups (source material from Port Adelaide Enfield Council as previously) use of excess build up of sand and seaweed from Northhaven breakwater.
    Existing levy bank to be used as heavy barrier material. ( no material cost involved ) only pick up and delivery and a front end loader for dispersal.
    3. Cover iron sulphide contaminated section in northwest corner with calcium chloride ( the white alkali stuff ) as recommended as best solution to neutralise industrial acidic contamination. Mountains of the material remain after the Penrice closure could be also be used for reinforceing the existing walking trail construction.
    4. By opening the mouth of Mutton Cove Creek to its original natural state would solve problem of the silt affecting the shipping channel by slowing the flow rate ( This issue needs to addressed ASAP )
    Finally– Peri Colemans vision of a board walk as hands on environmental site for local schools and tourist needs to be fulfilled.
    Thanks to the many dedicated workers and volunteers who resurrected the rusty hulk Mutton Cove and gave us a great community asset.

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