Community Meeting 11 December 2014 Project Ecology The Coorong - - PowerPoint PPT Presentation

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Community Meeting 11 December 2014 Project Ecology The Coorong - - PowerPoint PPT Presentation

Mar 21, 2024 327 likes •583 views

South East Flows Restoration Project Community Meeting 11 December 2014 Project Ecology The Coorong Listed Wetland of International Importance (Ramsar site) Meets 8 of 9 criteria Cultural values Economic values Lies within the

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South East Flows Restoration Project Community Meeting 11 December 2014

Project Ecology

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The Coorong

» Listed Wetland of International Importance (Ramsar site) » Meets 8 of 9 criteria » Cultural values » Economic values » Lies within the South East NRM Region » Restoring and maintaining health

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Historical South East flows

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Contemporary South East drainage system

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Maintaining a healthy Coorong

source: CSIRO modelling if salinity too high → Coorong stressed “insurance policy” 1 ML from SE = 40 ML over barrages Coorong Health Requirements

SEFRP Barrage Flows

Coorong Health Requirements SEFRP Barrage Flows Murray Mouth open

Coorong Health Requirements SEFRP Barrage Flows Murray Mouth open

Water levels (entire Coorong)

Coorong Health Requirements SEFRP Barrage Flows Murray Mouth open

Water levels (entire Coorong)

North Lagoon salinity

Coorong Health Requirements SEFRP Barrage Flows Murray Mouth open

Water levels (entire Coorong)

North Lagoon salinity

South Lagoon salinity  

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Morella Basin Tilley Swamp watercourse Taratap wetlands Murrabinna and Lacepede Flats

Blackford Drain outlet Coorong South Lagoon

Tilley Swamp Conservation Park

SEFRP Project Area

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en route wetlands: land management

  • 11,290 ha total
  • 9,440 ha managed for conservation

– 2 Conservation Parks (Tilley Swamp, Martins Washpool) – 7 Heritage Agreements – 4 Management Agreements

  • SEFRP opportunity to increase diversions into en route wetlands

subject to landholder perspectives

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en route wetlands: values

Seasonal brackish aquatic bed Lowest lying, most deeply inundated areas

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en route wetlands: values

Gahnia filum tussock sedgeland Intermediate elevations, shallow inundation most years

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en route wetlands: values

Melaleuca halmaturorum tall shrubland Wetland margins, occasional shallow inundation

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en route wetlands: values

  • Spring 2012 monitoring:

– Taratap

  • 8,700 waterbirds (24 species)

Migratory and resident waders, waterfowl

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en route wetlands: values

  • Spring 2012 monitoring:

– Morella

  • 4,200 waterbirds (21 species)
  • 2 fish spp (4 spp known to occur)
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en route wetlands: threats

  • Terrestrialisation – shrubs invading open water areas

2003 2008 2013

  • Solution: more water required
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water management infrastructure

  • 8 existing in-channel diversion regulators - replaced
  • 12 existing cross-overs/unders – replaced
  • potential for additional – refined through detailed design
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Taratap Wetlands 27 August 2013

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Taratap Wetlands 27 August 2013

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Tilley Swamp watercourse 27 August 2013

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Morella Basin 27 August 2013

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Salinity thresholds in SE wetlands

FRESH: <3000 EC Seasonal freshwater aquatic bed BRACKISH: 3000 – 17,000 EC Seasonal brackish aquatic bed SALINE: 17,000 – 60,000 EC Seasonal saline low aquatic bed

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en route wetlands: SEFRP opportunity

  • Salinity diversion thresholds: <7,500 EC Taratap wetlands

<10,000 EC Tilley Swamp

  • Volumes:

– Taratap wetlands: c. 2,000 ML (2 GL) – Tilley Swamp Conservation Park: c. 2,000 ML (2 GL) – Tilley Swamp watercourse: 5,000 – 20,000 ML (2 GL) Diversions en route subject to landholder discussions

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en route wetlands: SEFRP opportunity

Blackford Drain flow and EC data 2009 - 2013

Suitable for Taratap and Tilley Swamp (<7,500 EC) Suitable for Tilley Swamp only (7,500 – 10,000 EC) Year Total Flow (ML) SEFRP Divertible Flow (i.e. <800 ML/day) (ML) Divertible Flow (ML)

  • No. Days

Divertible Flow (ML)

  • No. Days

2009 31,617 2010 2011 2012 2013 Suitable for Taratap and Tilley Swamp (<7,500 EC) Suitable for Tilley Swamp only (7,500 – 10,000 EC) Year Total Flow (ML) SEFRP Divertible Flow (i.e. <800 ML/day) (ML) Divertible Flow (ML)

  • No. Days

Divertible Flow (ML)

  • No. Days

2009 31,617 31,617 2010 2011 2012 2013 Suitable for Taratap and Tilley Swamp (<7,500 EC) Suitable for Tilley Swamp only (7,500 – 10,000 EC) Year Total Flow (ML) SEFRP Divertible Flow (i.e. <800 ML/day) (ML) Divertible Flow (ML)

  • No. Days

Divertible Flow (ML)

  • No. Days

2009 31,617 31,617 12,788 (40%) 28 2010 2011 2012 2013 Suitable for Taratap and Tilley Swamp (<7,500 EC) Suitable for Tilley Swamp only (7,500 – 10,000 EC) Year Total Flow (ML) SEFRP Divertible Flow (i.e. <800 ML/day) (ML) Divertible Flow (ML)

  • No. Days

Divertible Flow (ML)

  • No. Days

2009 31,617 31,617 12,788 (40%) 28 10,888 (34%) 44 2010 2011 2012 2013 Suitable for Taratap and Tilley Swamp (<7,500 EC) Suitable for Tilley Swamp only (7,500 – 10,000 EC) Year Total Flow (ML) SEFRP Divertible Flow (i.e. <800 ML/day) (ML) Divertible Flow (ML)

  • No. Days

Divertible Flow (ML)

  • No. Days

2009 31,617 31,617 12,788 (40%) 28 10,888 (34%) 44 2010 28,441 28,232 14,037 (50%) 66 6,503 (23%) 97 2011 19,182 19,182 6,592 (34%) 68 5,958 (31%) 113 2012 18,547 18,547 2,980 (16%) 44 5,610 (30%) 63 2013 39,664 37,749 18,656 (49%) 35 13,677 (36%) 110

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marine environment: SEFRP benefits

27 August 2013

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marine environment: SEFRP benefits

Drain impact studies Seddon, S., et al. (2003). Beachport Seagrass Loss and Links with Drain M in the Wattle Range Catchment. Report prepared for Coast Protection Board, Department for Environment and Heritage and the Environment Protection Authority. SARDI Aquatic Sciences Publication No. RD03/0190. Adelaide, South Australia, South Australian Research and Development Institute, Aquatic Sciences. Wear, R. J., et al. (2006). The impact of drain discharges on seagrass beds in the South East of South Australia. Final Report Prepared for the South East Natural Resource Consultative Committee and the South East Catchment Water Management Board. RD04/0229-3. Adelaide, South Australia, South Australian Research and Development Institute (Aquatic Sciences) and the Department of Environment and Heritage, Coast Protection Branch.

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marine environment: SEFRP benefits

Wear et. al: “the inshore limit of seagrass distribution in Lacepede Bay at Kingston has receded seaward by 84 m in the past 20 years” “… initial seagrass loss … can destabilise the area and result in further losses”

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SEFRP environmental management program

  • Native vegetation clearance assessment

– includes flora and fauna

  • Water quality and quantity monitoring

– in Coorong – in drains – during construction – permanent stations

  • Wetland flora and fauna monitoring
  • Operations manual