LIGHT RIVER ACTION PLAN Part B: Risk Assessment and … · 2017. 7. 14. · Light River Estuary...

LIGHT RIVER ACTION PLAN

Part B: Risk Assessment and

Management Actions

Light River Estuary Action Plan: Part B – Risk Assessment & Management Actions

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Light River Estuary Action Plan Prepared by Environmental and Biodiversity Services Ecology (EBS Ecology) for Adelaide Mt

Lofty Ranges Natural Resource Management Board

COPYRIGHT: Use or copying of this document in whole or in part (including photographs) without the

written permission of EBS Ecology constitutes an infringement of copyright.

LIMITATION: This report has been prepared on behalf of and for the exclusive use of EBS Ecology’s Client, and is

subject to and issued in connection with the provisions of the agreement between EBS Ecology and its Client. EBS

Ecology accepts no liability or responsibility whatsoever for or in respect of any use of or reliance upon this report by

any third party.

CITATION: EBS Ecology (2012). Light River Estuary Action Plan. Environmental & Biodiversity Services Ecology,


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TABLE OF CONTENTS

1 RISK ASSESSMENT ......................................................................................................................................... 1

2 LAND MANAGEMENT ZONES AND ACTIONS ................................................................................................. 6

List of Tables

Table 1. Likelihood and Impact Severity ................................................................................................. 1

Table 2. Overall assessment of risk ........................................................................................................ 2

Table 3. Overall EAP management issue risk summary (all management zones) ................................. 3

Table 4. Action plan and costed work plan .............................................................................................. 8

List of Figures

Figure 1. Location of management zones and priority management issues for Light River

Estuary EAP ............................................................................................................................. 7


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1 RISK ASSESSMENT

A Risk Assessment Tool was used to determine a risk ranking for each land management issue

discussed in Part A. This involved an assessment of the likelihood of the risk (Table 1) and level of

impact for each issue, to calculate an overall risk ranking of Extreme, High, Medium or Low (Table 2).

The supporting guidelines and descriptors that the assessment tool is based on are outlined below.

The results of the assessment are shown in

Table 3. The actions recommended are prioritised based on this assessment. The risk assessment was

undertaken for the ‘whole EAP’ level, rather than for each zone.

Table 1. Likelihood and Impact Severity

Level Likelihood Description Gauge * Frequency

1 Rare Will only occur in exceptional circumstances

< 5% chance of occurring Very unlikely during the next 20 years

2 Unlikely Could occur 5% - 25% chance of occurring May occur during the next 5 to 20 years

3 Moderate Should occur at some time 25% - 75% chance of occurring May arise at least once in a 5 year period

4 Likely Will probably occur 75% - 95% chance of occurring Will occur once in a year

5 Almost certain

Expected to occur > 95% chance of occurring Will occur at least several times a year

* % of times will occur during a 12 month period

Level Impact Description Recovery Time

1 Insignificant Possible impacts, but minimal or no environmental damage and not easily noticed

N/A

2 Minor Short-term effect (or potential effect) on the environment. Very local or temporary consequence

< 1 month to recover

3 Moderate Significant local or temporary changes, but can be rehabilitated, remediated or mitigated with difficulty at significant cost

1–12 months to recover requiring some intervention.

4 Major Long-term impact (or potential impact) on the environment. Only partially able to be rehabilitated or alleviated

1-5 years to recover requiring significant intervention.

5 Catastrophic Permanent damage to the environment (or potential to permanently damage the environment). Significant area and/or species affected. Not able to be rehabilitated or alleviated.

N/A


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Table 2. Overall assessment of risk L

ikelih

oo

d

5 Almost certain H H E E E

4 Likely M H H E E

3 Moderate L M H E E

2 Unlikely L L M H E

1 Rare L L M H H

1 2 3 4 5

Impact

E Extreme Risk: Requires immediate action, action within 3 months

H High Risk: Management Attention Needed, Budget Provision in next Financial Year

M Medium Risk: Management responsibility must be specified

L Low Risk: Manage by routine procedures


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Table 3. Overall EAP management issue risk summary (all management zones)

Management Issues Assumption Likelihood Consequence Risk

Assessment

Land Tenure (Mining)

Future development of inactive mining tenements within saltmarsh areas of the EAP

Development of inactive mining tenements is unknown by Cheetham Salt and cannot be defined in this EAP providing it difficult to determine management objectives for the estuary.

2 3 M

No current PEPR and lack of knowledge on future activities or mitigation methods make it difficult to determine management objectives for the estuary

2 1 L

Future development of the southern section of the northern connector road corridor could impact on the operations of Cheethams crystallisation pans and the company would need to consider relocating mining operations northwards into the estuary. Lack of funding has immobilised the development of the southern section of the road and it appears unlikely it will affect Cheetham Salt operations; however this scenario is uncertain.

3 4 E

Relinquishing of mining tenements by Cheetham before lease terminates Relinquishing of mining tenements by Cheetham could result in a lack of ‘informal protection’ and ownership of the estuary. In this scenario tenements would need to be secured under the control of the Minister for the Environment and incorporated into the natural reserve system.

2 4 E

Landuse / Development Pressure

30-year Plan for Greater Adelaide Inability to quantify future development pressure and the extent of coastal development within urban growth areas proposed in the 30-year Plan for Greater Adelaide and how this will affect estuarine environments.

2 1 L

Increased agricultural practices / population growth / infrastructure

Increased population growth or surrounding landuses could result in increased pollutant levels entering the estuarine system (nutrients or salinity) and changes to flow volumes. Changed conditions could result in biodiversity impacts (i.e. change to estuarine ecological processes, loss of aquatic habitat and aquatic fauna species, seagrass beds and saltmarsh areas). The lack of current water quality and flow data prohibits changes to be detected in the estuary that can be related to increased development pressure.

3 3 H

Future development and disturbance of the area may lead to loss of habitat for coastal species, especially shorebird habitat within high-tide areas.

3 4 E

Increased recreational use

The number of recreational boat users may increase at Middle Beach boat ramp and further widen the boat worn channels in the seagrass beds. Channel widening would reduce the low tide mark and change the hydrology and estuarine processes of the tidal creeks.

3 4 E

Future development of the area may lead to increased recreational use of the EAP and degradation or pollution to creek channels and associated habitat. Current lack of public perception of the conservation value of the area prevents users from treating the area as a ‘high conservation area’.

3 2 M

Hydrological Changes

Altered flow volumes

Increase in population growth and water extraction for farming practices could result in reductions in stream flow and less flushing of the river system, or increased stormwater run-off. Changed conditions could result in changes in natural salinity levels or biodiversity impacts (i.e. loss of aquatic habitat and aquatic fauna species, seagrass beds and saltmarsh areas).

3 4 E

Water quality

Increase population growth could result in increased pollutant levels entering the estuarine system (nutrients or salinity). Changed conditions could result in biodiversity impacts (i.e. change to estuarine ecological processes, loss of aquatic habitat and aquatic fauna species, seagrass beds and saltmarsh areas).

3 4 E

Lack of monitoring gauges and understanding on natural water quality / flow volume levels for the estuary

Mingays Waterhole gauging station on the Light River (above Hamley Bridge) is the only location where detailed water quality data has been gathered since 1985. The closest gauging station to the estuary, the Light River Delta gauging station (A5051003) only records stream flow and flow volume, but not salinity or nutrient data. Annual monitoring data is needed closer to the estuary. No baseline information could result in adverse water quality / flow changes remaining undetected.

2 4 E

*Climate Change


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Sea level rise / Storm surges

Changes to estuarine habitat, in particular loss of saltmarsh and dune habitat. Consequential changes in species assemblage and weed colonisation. Loss of threatened species habitat, especially Tecticornia flabelliformis habitat.

4 4 E

Installation of levee banks or similar infrastructure to protect from flood events and from the encroachment of saltmarsh, preventing marsh retreat resulting in a lack of marsh retreat zones.

4 4 E

Mangrove Incursion Colonisation of saltmarsh habitat and loss of chenier dunes and sabkahs. 4 4 E

Loss of Tecticornia flabelliformis habitat / populations If sabkha areas are inundated with sea water, habitat conditions will alter (i.e. soil salinity decreases) and other species may outcompete T. flabelliformis and colonise its habitat (i.e. Sarcocornia spp. which can tolerate lower salinity saturated conditions).

4 4 E

Potential Acid sulphate soils

Exposing potential acid sulphate soils Low potential for development from mining to expose acid sulphate soils in currently inactive mining tenements of saltrmarsh areas. Management of PASS soils will be at the discretion of Cheetham Salt and will require review in the PEPR.

1 1 L

Off Road Vehicles (ORV)

Vehicles entering sabkhas, saltmarsh and dunes

Illegal off-road driving causing significant environmental damage (erosion, native vegetation, soil compaction, loss of habitat especially Tecticornia flabelliformis habitat, and disturbance to bird populations) is an ongoing issue requiring prevention, maintenance, and monitoring. Left unmanaged would result in significant environmental damage and public perception that this behaviour is acceptable/actions won’t be prosecuted.

5 4 E

Vandalism Barriers and to prevent vehicle entry into sabkhas from Light Beach Road is met with ongoing vandalism and community irritation.

4 2 H

Weeds

Weeds (general) Ongoing spread of declared and environmental weeds. Focus to date concentrates on African Boxthorn. Artichoke Thistle and Calomba Daisy will continue to spread to unaffected dune / sandy areas without control efforts.

5 4 E

Pest control / Revegetation Lack of overarching control / restoration strategy to date, as access limited resulting in further weed spread.

5 4 E

Pest Animals / Grazing Pressure

Deer High deer activity with noticeable tracks and scats widespread throughout EAP. High deer activity poses a risk of trampling and grazing on saltmarsh habitat, compaction of soil, and Tecticornia flabelliformis habitat loss through grazing and trampling.

5 4 E

Cattle / Sheep Cattle / sheep activity poses a risk of Tecticornia flabelliformis loss through grazing and trampling, soil loss, and general biodiversity impacts (i.e. nutrient loading) and must be controlled on Crown Land.

5 4 E

Rabbits Rabbit activity poses a risk of soil loss, biodiversity impacts through grazing and competition with native animals, and must be controlled to meet legislative requirements. Limited level activity was observed within the EAP, but risk is expected to be higher than observed in chenier dunes.

4 3 H

Foxes Foxes pose a risk to biodiversity through predation and must be controlled to meet legislative requirements. Pose particular risk to threatened coastal birds. Three individual foxes observed on EAP during field visits.

4 3 H

Conservation of Biodiversity

Grazing pressure (see also Pest Animals) High deer activity with noticeable tracks and scats widespread throughout EAP. Rabbits in low numbers (only 2 observed during field visit). Grazing pressure from deer, sheep, and rabbits threatens survival of threatened species and general vegetation regeneration

5 4 E

Lack of protection of integrity of intact native vegetation EAP has high ecological value and must be managed as such, to ensure protection of the intact coastal / estuarine system. It is part of Clinton Biounit wetland of national importance. Need to prevent incursion of threats into high value areas.

4 4 E

Lack of habitat protection for species of conservation significance

EAP provides significant habitat for listed migratory wader and shorebirds. EAP provides significant habitat for the EPBC Act nationally threatened Tecticornia flabelliformis, as well as the NPW Act state threatened Slender-billed Thornbill. Aquatic habitat is available for protected marine species (Deep-bodied pipefish) under the EPBC Act and Fisheries Mgt Act 2007. The EAP must be managed to preserve the habitat of such significant species, to meet legislative requirements and NRM Board policies.

4 4 E


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Priority management actions in Part A are based on the outcomes of this risk assessment.

* Long-term risk of climate change may be higher, and is largely outside of the control of land managers.

Impact: ranked from 1 (insignificant) to 5 (catastrophic)

Likelihood: ranked from 1 (unlikely) to 5 (frequent)

Risk:

E = Extreme Risk: Requires immediate action, action within 3 months

H = High Risk: Senior Management Attention Needed, Budget Provision in next Financial Year

M = Medium Risk: Management responsibility must be specified

L = Low Risk: Manage by routine procedures

Public Education/Awareness

Public perception / Inadequate tourism and interpretative signage lead to damage of the area.

Low level of awareness in the general community of estuaries as important natural environments that need protection. Need to improve the understanding and awareness of South Australian estuaries within the community, leading to more appropriate behaviour. At present allowed activities and restrictions are not clearly stated.

3 2 M

Future Marine Park Zoning of Upper Gulf St Vincent in 2012 could be seen as a negative by recreational users

The Upper Gulf St Vincent Marine Park is projected as a sanctuary zone, preventing removal of plants or animals. Current allowed activities will change dependent on Marine Park Zoning regulations to be implemented in late 2012. The reaction of the public to the zoning of the estuarine waters as a sanctuary zone is unknown and needs to be addressed in a positive light.

2 1 L

Rubbish dumping Litter contributing to loss of site amenity, possible risk to wildlife, and water quality.

2 1 L Garden waste dumping (particularly near housing) could be a source of new weeds.

Other

Shared Management Jurisdiction and lack of coordinated approached to management

Complex management arrangement across multiple agencies affects ability to achieve objectives and actions or see area formally protected under international agreements or conservation legislation.

4 3 H


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2 LAND MANAGEMENT ZONES AND ACTIONS

Recovery actions and zones selected for management have been prioritised using the risk assessment

matrix, coupled with a combination of information and data sources. These involve expert knowledge,

community consultation, existing management documents, and analysis from outputs of GIS mapping.

Two management zones have been defined for the EAP and are represented in Figure 1. The two zones are largely defined as: Zone A) seaward section of EAP representing inter-tidal

samphire saltmarsh and mangrove saltmarsh that are susceptible to climate change impacts (sea-level

rise); and Zone B) landward section of EAP representing supra-tidal saltmarsh and agricultural lands that

are susceptible to land management. These zones were defined by tidal influences, access potential and

the extent of management required. In general, active management of the estuary decreases from the

landward side to the seaward side (Zone B to Zone A); the majority of management issues within the tidal

inundation areas of the saltmarsh (Zone A) are related to climate change induced impacts and/or are not

quantifiable impacts, whereas most issues within the landward side (Zone B) are directly related to man-

induced impacts and can be actively managed and accessed.

A detailed action table is provided outlining the management strategies, the management zone each

strategy relates to and suggested locations (where relevant), priority for action, key partners, timeframe

and an indicative costing. A timeframe is allocated to each action, which relates to a target date or time

period and is expressed as immediate (requires action as soon as possible), short (1-3 years), medium (3-

5 years), long (beyond 5 years), and ongoing. The time of year is specified if works are only suitable at a

certain time of year (e.g. weed control).

Relevant actions from the MANCAP (2009) and Draft Samphire Coast Conservation Strategy (DCM 2003)

have been considered for each zone.


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Figure 1. Location of management zones and priority management issues for Light River Estuary EAP


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Table 4. Action plan and costed work plan

Management Issue Risk MAP ID Zone Management Strategy Key Actions Timing/

timeframe

Cost estimate

Key Partners

Links to MANCAP Actions

Links to Draft

Samphire Objectives

Land Tenure (Mining)

Development of inactive mining tenements is unknown by Cheetham Salt. Development of the northern connector road is unknown.

M

Mining Tenement

map N/A

Foster collaboration and consultation strategy

Develop rapport with Cheetham Salt and consult with company representatives on future direction of mining operations

Ongoing & as required

Operating cost

AMLR, DMITRE, Cheetham

8.8 – for

AMLR to work with DMITRE and DEWNR

to review mining

tenements within

saltmarsh areas

-

PEPR in development and lack of public knowledge on future activities or mitigation methods.

L N/A N/A Foster collaboration and consultation strategy

Surrender of mining tenements by Cheetham could result in a lack of ‘informal protection’ and ownership of the estuary.

E N/A N/A

Foster collaboration and consultation strategy Secure tenements under formal protection

Consult with Cheetham Salt company representatives on future direction of mining operations.

Consult with DEWNR on process to secure tenements under reserve network in the event mining tenements are surrendered.

Have a procedure in place to secure tenements under the control of the Minister for the Environment and incorporate into the natural reserve system, if become available.


Operating cost

AMLR, DEWNR, Cheetham

Landuse / Development Pressure

Inability to quantify future development pressure and the extent of coastal development within urban growth areas proposed in the 30-year Plan for Greater Adelaide.

L N/A Outside of EAP

Inter-agency and local government consultation Monitor

Inter-agency and local government consultation required. Government agencies to consult and review development potential and future planning strategies for Samphire Coast. Keep abreast of future developments within 30-yr Plan for Greater Adelaide.

DC Mallala to identify objectives / strategies within development and strategic plans that consider biodiversity conservation outcomes. Report conservation objectives of Samphire Coast (inc. estuary) to planning authorities.


Operating cost

AMLR; DEWNR; DMITRE;

DPTI; DCM(and other local councils)

-

-

Increased population growth or surrounding landuses could result in increased pollutant levels entering the estuarine system (nutrients or salinity) and changes to flow volumes. Changed conditions could result in biodiversity impacts.

H N/A Outside of EAP

Foster collaboration and consultation strategy Monitor

Implement cooperative partnerships with industry to ensure that water use and run-off associated with production and industry complies with sustainability objectives

Monitor and analyse water quality data (refer to actions for Hydrological Changes).


Operating cost

AMLR; DCM;

Private Operators

-

-

Future development of the area may lead to increased recreational use of the EAP and degradation or pollution to creek channels and associated habitat.

M N/A Outside of EAP

Monitor

Monitor increase in vandalism, rubbish dumping, or ORV use by undertaking regular (monthly) patrol along main roads and built up areas nearby estuary. Record new ORV tracks, vandalism, or rubbish increases. Liaise with new housing developers to ensure information on local environmental values and ways to mitigate disturbance, weed invasion is distributed to new householders. Maintain NRM community outreach programs involving nearby townships and locals (Coastal Gardens, Coastal Ambassadors and shorebird workshops and monitoring programs.

If an increase in visitation / recreation levels are noted, review adequacy of current interpretative signage and infrastructure (rubbish bins, public facilities etc).

Monthly & as required

Operating cost

AMLR; DCM; DPTI, developers

- -


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timeframe

Cost estimate

Key Partners


Links to Draft

Samphire Objectives

Link management to ORV actions.

The number of recreational boat users may increase at Middle Beach boat ramp and further widen the boat worn channels in the seagrass beds. Further channel widening could reduce the low tide mark and change the hydrology and estuarine processes of the tidal creeks.

E N/A

Off-shore - Outside of EAP

Monitor Aim to prevent further damage

If possible, liaise with Bureau of Meteorology to establish a permanent tide gauge within a tidal creek nearby Middle Beach and record data daily. Review data annually during review of EAP (each July – refer to Other actions).

If a tide gauge is not established, at a minimum monitor tide levels at Salt Creek tide gauge (54H 263321E 6167051N) and review annually.

Short Operating

cost AMLR, BOM - -

Hydrological Changes

Lack of monitoring gauges and understanding of natural water quality / flow volume levels for the estuary. No baseline information could result in adverse water quality / flow changes remaining undetected.

H N/A N/A Establish monitoring gauge

Establish a permanent monitoring gauge (quality and flow data) within the estuary and record data at fixed time periods (i.e. weekly or monthly). Review data annually during review of EAP (each July – refer to Other actions).

If another monitoring gauge is not established, at a minimum review data from Light River at Pt Wakefield Rd (A5051003) monitoring gauge.

Define acceptable nutrient and flow data levels. Determine course of action and management controls if data exceeds acceptable levels. Consult with planning authorities to review long-term development and growth strategies affecting the estuary.

Determine fish indicator species to monitor for water quality / estuarine health and survey annually.

Short Operating

cost

AMLR, SARDI, DWLBC

- -

Increase in population growth and water extraction for farming practices could result in altered flow volumes. Changed conditions could result in biodiversity impacts.

E N/A N/A Monitor

Increase population growth could result in altered water quality and pollutant levels entering the estuarine system (nutrients or salinity). Changed conditions could result in biodiversity impacts.

E N/A N/A Monitor

*Climate Change

Sea level rise: Changes to estuarine habitat, in particular loss of saltmarsh and dune habitat.

E N/A N/A Monitor and planning

Monitor saltmarsh areas subject to potential sea level rise. Monitor by on-ground surveys or aerial photography. Consider survey results in future risk planning.

Identify opportunities (or lack of) for recession of tide-dependent species on the landward side of the EAP. Map known levee banks / barriers to retreat and update annually. Consider results in future risk planning. Reclaim surrounding agricultural lands and surrender under the reserve system to allow for marsh retreat. Ensure flood management planning takes into consideration natural resources issues.

Research habitat requirements of Tecticornia flabelliformis in regard to necessary Sabkha conditions. Continue to monitor known populations and current distribution (See Conservation of Biodiversity actions).

Short –

long term

~ $2000 if

using private contractors

for monitoring

AMLR,

DPTI, DCM, DEWNR, private

contractors (if required)

8.9 – To identify

suitable areas for buffer zones for saltmarsh retreat. To

review development

plans for provisions of buffer zones.

-

Sea level rise: Installation of levee banks or similar infrastructure to protect from flood events and from the encroachment of saltmarsh, preventing marsh retreat.

E N/A N/A Monitor and planning

Mangrove Incursion: Colonisation of saltmarsh habitat and loss of chenier dunes and sabkahs.

E Mangrove Incursion

Map

Zone A Monitor and planning

Loss of Tecticornia flabelliformis habitat / populations

E

Bead Samphire

habitat map

Zone A & B

Monitor and planning Research

Potential Acid sulphate soils

Exposure potential acid sulphate soils by mining operations

L PASS map

All of EAP

Foster collaboration and consultation strategy

Consult with Cheetham Salt company representatives on future direction of mining operations

Short-medium

Operating cost

Cheetham, AMLR

8.7 – Principles of PASS zones

take regard of

-


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timeframe

Cost estimate

Key Partners


Links to Draft

Samphire Objectives

these areas

Off Road Vehicles (ORV)

Vehicles entering sabkhas, saltmarsh and dunes causing significant environmental damage, especially to Tecticornia flabelliformis habitat and areas of very high environmental significance.

E

ORV map – showing

priority areas

Zone B Foster collaboration and consultation strategy

Collaborate with relevant agencies and develop state-wide strategies for management of ORV impacts.

Consider suitable enforcement options to address off road vehicle impacts through the Local Government Land Access working group. Considerations:

- Establishment of Codes of Practice through community and representative user – organisations

- Enactment of Council By-Laws to enforce breaches of the Code of Practice

- enactment of State Government legislation to prohibit and/or control identified activities on Council land

- Formalise ORV facilities outside areas of high conservation areas and easily accessible by public

Short & ongoing

Operating cost

DCM, other local

councils, SAPOL, DEWNR,

NRM Boards

8.4 – To assist

DCM in establishing

access control of vehicles on its beaches

Obj. 2 – Sensitive coastal

environments free of off

road vehicle and

motorcycle use

Zone B

Prevent and Monitor current ORV tracks Prompt response to illegal Off-road Driving and sabkha or dune damage

Undertake regular (monthly) patrol along main roads nearby estuary. Record new ORV tracks and vandalism. Report illegal activities/acts of vandalism to SA Police.

Close-off all obvious vehicle entry points into north and south sabkhas of the EAP with concrete bollards and rail fencing barriers. Install signage across entry points. Sign “Vehicle entry into saltmarsh strictly prohibited”:

Continue to prohibit Light Beach access via padlocked gate on Light Beach Rd after 3-year trial ends. Install concrete bollards at either side of Light Beach gate to prevent 4WD accessing area over existing dirt mounds.

Review ‘potential’ areas to prevent ORV access, as depicted on Management Zone map (Figure 1). Install signage across entry points. Sign “Vehicle entry into sbakhas strictly prohibited”: Materials: Signs to have a simple consistent message. Signs should be aluminium, to standards, and large enough so they can be read from vehicles. Rail should be irrigation polypipe (no wire inside). Fence posts should be 12 inch permapine, dug 1 m into ground, 1 m above, and no more than 2 m apart so cars can’t get through. For guidelines on design and materials refer to National Aquatic and Recreational Signage Style Manual - State Government of Victoria (2006).

Monthly

Short

Short

Immediate

Operating cost

~ $5000 for fencing and

$250 for signage

~ $1500

Operating

cost

AMLR, DCM

AMLR, DCM

AMLR, DCM

AMLR, DCM

Ongoing vandalism to barriers and community irritation.

H N/A N/A Record and report illegal activity

Implement protocol “What to do if observe illegal activity in no-go zones or identify areas of environmental damage caused by ORV or human activities?” Encourage community monitoring of the estuary and beaches. Provide contact phone number on signage/ DC Mallala website to report vandalism/issues.

Print protocol and distribute to staff (Appendix 16).

Report illegal activities/acts of vandalism to SA Police.

Incorporate follow up action / remediation into DC Mallala / AMLR NRMB works plans.

Immediate & Ongoing

Operating

cost

AMLR, DCM

-

Obj. 3 – Prevention of vehicle and

rubbish dumping

Weeds

Ongoing spread of declared and environmental weeds. African Boxthorn, Artichoke Thistle and Calomba Daisy will

E Weed map

Showing Zone B

Continue to undertake declared weed control

Maintain funding for AMLR NRMB Woody weed control; control re-emergence of Boxthorn and expand to target other priority species (i.e. Artichoke Thistle & Calomba

Immediate & ongoing

As per annual funding

AMLR, DCM

8.2 – Support

-

http://www.vcc.vic.gov.au/assets/media/files/SignageManual3.pdf



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timeframe

Cost estimate

Key Partners


Links to Draft

Samphire Objectives

continue to spread to unaffected dune / sandy areas without control efforts.

priority areas

Daisy) and hotspot areas. better containment of

weeds from coastal urban

areas. Develop a

weeds watch early warning system with a

rapid response

capability to tackle coastal

weeds

Zone B Prevent further weed spread into areas of high ecological value

ALMR NRMB to review extent of weeds and promote control of large weed infestations on agricultural land. Consult with surrounding landholders on the effects of declared weeds on their property. Enforce appropriate control action, as required under the NRM Act 2004

Ensure that legal mechanisms are in place to identify notices on land relating to pest species control

Targeted weed management in areas of high weed infestation surrounding landward zone of EAP (see below individual species actions).

Prompt control of any new infestations of declared species to be controlled as highest priority and incorporated into DC Mallala / AMLR NRMB works plans.

Immediate & ongoing

Operating cost

AMLR, DCM

Priority for Zone

B, but Zone A if possible

Monitoring and review

Reassess/resurvey/map weeds/identify new outbreaks and priorities on annual basis (3 days per year). Record data (control and weed outbreaks) within a weed register and update annually.

Establish a mapping system to link with a weed register database and incorporate into ongoing monitoring of weeds (especially declared and environmental weeds)

Establish a program for early detection of new weed species and outbreaks of existing weeds and a contingency strategy for control.

Review legislative changes, responsibilities and processes relating to control of weed species.

Immediate & annually

~ $3000 (if use private contractor)

AMLR, DCM,

Private contractors (if required)

Lack of overarching control / restoration strategy to date, as access limited resulting in further weed spread.

E

Priority

for Zone B, but

Zone A if possible

Collaboration with other stakeholders

AMLR NRMB to collaborate with Cheetham Salt to determine areas to target weed infestations, report on new weed incursions and share knowledge.

Review weed control works completed by Cheetham Salt and AMLR NRMB / DC Mallala and incorporate into annual reporting.

Immediate & ongoing

Operating cost

AMLR. Cheetham,

DCM

Lycium ferocissimum (African Boxthorn) / Cynara cardunculus (Artichoke Thistle) / Pentzia suffruticosa (Calomba Daisy)

E

Priority for Zone

B

Aim to prevent further spread from agricultural lands and control within EAP.

Target control within North and North-eastern area of EAP and within surrounding agricultural land.

If not grazed, plant appropriate native plant species (grown from local seed, suited to landform) within private lands and within landward dunes to stabilise and re-vegetate (e.g. Olearia axillaris, Nitraria billardierii, Myoporum insulare, Poa spp., Austrostipa spp.).

Immediate & ongoing

~ $4500 for 1 weeks work using private contractors

AMLR, DCM Private

contractors (if required)

Roadside weed infestation; some weeds pose threat to native vegetation.

E N/A Outside of EAP

Prevent spread of roadside weeds to unaffected areas.

Roadside spraying of weeds, primarily on Middle Beach Rd, Light Beach Rd, and McEvoy Rd. Common roadside weeds include: Avena barbarta., Scabiosa atropurpurea, Reichardia tingitana, Eragrostis sp., Bromus spp. , Asphodelus fistulosus, Cynara cardunculus, Solanum nigrum, Marrubium vulgare, Gazania sp., Opuntia sp., Piptatherum miliaceum, Lactuca

Immediate & ongoing

Operating cost

AMLR, DCM


12


timeframe

Cost estimate

Key Partners


Links to Draft

Samphire Objectives

serriola, Pentzia suffruticosa , Lycium ferocissimum.

Pest Animals / Grazing Pressure

High deer activity with noticeable tracks and scats widespread throughout EAP. High deer activity poses a risk of trampling and grazing on saltmarsh habitat, compaction of soil, and Tecticornia flabelliformis habitat loss through grazing and trampling.

E N/A

Zone A & B and

Outside EAP

Monitor and foster collaboration

Determine the population and distribution of deer within the estuary through a once-off monitoring field survey and use of trail cameras to determine the actual impact in areas of high conservation. Report the real extent of impact of the species on important habitats (i.e Tecticornia flabelliformis habitat).

Consult with surrounding landholders on the effects of deer on grazing land and numbers observed. Conduct a survey with all landholders (within a 5 km buffer) in the same period to determine the level and extent of activity observed at the same time of year.

Determine the cause of management required after monitoring data is collected (i.e. local or regional management). For example, is it more cost effective to install exclusion fences in high biodiversity value areas instead of conducting an ad-hoc culling program?

Collaborate with all regional NRM Boards and other government agencies on the best approach for a regional-scale deer control program (culling is not effective at a local scale only).

Short & ongoing

~ $3500 (for private

contractor for 1 wk survey)

Operating cost

Operating

cost

Operating cost

AMLR, DCM,

Cheetham, SA Rifle Range, consult private

contractors for

monitoring

-

-

Cattle / sheep activity poses a risk of Tecticornia flabelliformis loss through grazing and trampling, soil loss, and general biodiversity impacts (i.e. nutrient loading) and must be controlled on Crown Land.

E N/A Zone A

Prevent access of cattle within EAP and on Crown Land

Consult with surrounding landholders on the effects of cattle grazing on crown land within the estuary. Enforce appropriate control action, as required under the NRM Act 2004.

Immediate & ongoing

Operating cost

AMLR, DCM

- -

Rabbit activity poses a risk of soil loss, biodiversity impacts through grazing and competition with native animals, and must be controlled to meet legislative requirements. Limited level activity was observed within the EAP, but risk is expected to be higher than observed in chenier dunes.

H N/A

Zone A & B and

Outside EAP

Targeted rabbit control

Maintain funding for AMLR NRMB to co-ordinate rabbit control works. Target areas around Middle Beach, surrounding landholders on the eastern edge of EAP, northern dunes, and active revegetation sites and known warrens.

Collaborate with other regional AMLR NRMB offices to coordinate pest management.

Short & ongoing


AMLR,

DCM, other NRM

Boards

- -

Foxes and cats pose a risk to biodiversity through predation and must be controlled to meet legislative requirements. Pose particular risk to threatened coastal birds. Three individual foxes observed on EAP during field visits.

H N/A

Zone A & B and

Outside EAP

Manage fox and cat populations to minimise impact on native fauna, in line with legislative requirements

Collaborate with other regional AMLR NRMB offices to coordinate pest management.

If appropriate, undertake targeted and intensive baiting during shorebird nesting season (e.g. fairy terns, Red-capped Plovers) and Orange-bellied Parrot migration.

Short & ongoing


AMLR, DCM, other

NRM Boards

- -

Conservation of Biodiversity


13


timeframe

Cost estimate

Key Partners


Links to Draft

Samphire Objectives

Grazing pressure E N/A Zone B

Prevent access of stock within EAP and on Crown Land

See Pest Animals / Grazing Pressure Immediate & ongoing

- AMLR, DCM

- -

Improve understanding of estuary and biodiversity assets

E N/A All of EAP

Improve knowledge of flora / fauna on EAP Monitoring and Research

Complete follow-up fauna survey (in particular reptiles and birds) and significant species (Spring / Summer).

Encourage BirdLife Australia / NRMB/ Birds SA/ Local groups to survey the area and monitor threatened species (i.e. incorporate into their existing programs).

Research habitat requirements of Tecticornia flabelliformis in regard to Sabkha conditions. Continue to monitor known populations and current distribution.

Research and monitor water quality and tide level data to ascertain baseline data and monitor estuarine health as well as climate change impacts (links to Development Pressure, Climate Change and Hydrological Change actions).

Conduct aquatic sampling in channels, especially event based directional netting during winter/spring stream flow (may record three other state vulnerable species of Pouched Lamprey, Shorthead Lamprey and Climbing Galaxias).Conduct aquatic sampling in the shallow Zostera seagrass habitat to determine its significance for species from the Snygnathids family (listed under EPBC Act and protected species under the state Fisheries Management Act).

Investigate the permanency of pools on the lower most section of the Light River to determine extent and viability of fish habitat for localised populations.

Short - medium & ongoing

$5000–10000

-

~ $5000

~ $2000

$6000-10000

~ $1000

AMLR, DCM,

BirdLife Australia, Birds SA,

SARDI, CG, private

contractors for

monitoring / survey works

8.1 – AMLR to facilitate a survey of

reptiles and small

mammals in the saltmarsh areas from St

Kilda to Parham. For DEWNR to incorporate

gaps in knowledge in to biological

database

-

Lack of habitat protection for species of conservation significance

E N/A All of EAP

Propose formal protection of Samphire Coast

See actions for Other section. Immediate -

AMLR; DEWNR; BirdLife

Australia,

8.10 – To conserve the values of the Light River

Delta through establishment

of a conservation

park

-

Public Education/Awareness

Lack of public perception of the conservation value of the area prevents users from treating the area as a ‘high conservation area’. Lack of public perception leads to rubbish dumping, vandalism, damage to the area.

M N/A All of EAP

Establish webpage for Light River Estuary Install Interpretive signs Education programs

Establish/improve webpage on DC Mallala / AMLR NRMB. Webpage contents to include information on:

- Getting there - Use restrictions etc - History of estuary - Conservation value and ecological processes of

estuary - Photos of estuary - Any tourism / research opportunities

Immediate

Operating cost

DCM, AMLR

8.5 – To raise

public knowledge

and valuing of the saltmarsh area from Pt Adelaide to

Parham, including

Obj. 3 –

Prevention of vehicle and

rubbish dumping

Obj. 4 –

Provision of support


14


timeframe

Cost estimate

Key Partners


Links to Draft

Samphire Objectives

- Contacts for further information - Feedback form

Provide downloadable pdf pamphlet. Provide web links to linked management authority pages. Publicise website in local media.

Promote positive stories, responsible use of estuary and key messages through local media (e.g. estuary research, new findings, conservation protection).

Develop and install interpretive signs at Middle Beach near Boat Ramp and upgrade those along the Samphire Boardwalk Trail. Boardwalk signs to be placed at least 200 m from entry points to reduce likelihood of vandalism.

Key themes for interpretive signs: - Importance of estuaries / saltmarsh and habitat s

they provide - Tecticornia flabelliformis habitat - Aboriginal Heritage (historic use, middens) - Vegetation/habitat - Hooded Plovers - Migratory bird visitors and shorebrids - Common fauna - Marine Park/ marine fauna - Climate change

Use sturdy and strong high quality signs to deter vandalism. Talk to local staff from DC Mallala to determine best approach to signage and materials to use to prevent vandalism. Develop signs in accordance with SATourism Commission Guidelines for Producing Trail Signage (2003). For guidelines on design refer to National Aquatic and Recreational Signage Style Manual - State Government of Victoria (2006).

Support education programs (provide information on Web):

- Encourage landholders bordering EAP to plant low weed risk species (to reduce incidences garden plants invading onto EAP)

- Provide awareness of responsibilities regarding pest control – distribute letters / pamphlets and contact numbers of NRMB Pest Species Officers.

Short

Short

~$2500

Operating cost

DCM, AMLR,

DEWNR (sign advice) DCM, AMLR

conducting interpretative events, media

release, interpretative

signs.

infrastructure and facilities

Inadequate tourism and interpretative signage

M N/A All of EAP

Upgrade, maintain, and promote Samphire Boardwalk Trail

Resolve tenure and management of Samphire Boardwalk Trail. Management is preferred under the control of Middle Beach Caravan Park.

Determine feasibility and risk/benefit of upgrading boardwalk. Considerations:

- The area below the high water mark falls under DEWNR, and thus would require consultation if the trail was aligned over this area.

- Formalising the trail would require consultation with the existing Middle Beach Caravan Park, DEWNR,

Short – Medium

term

Operating

cost

DCM, AMLR,

DEWNR, Middle

Beach CP, PIRSA

Fisheries

http://www.tourism.sa.gov.au/WebFiles/Trail_Signs_-_Draft_Guideline.pdf






15


timeframe

Cost estimate

Key Partners


Links to Draft

Samphire Objectives

DC Mallala, Kuarna, PIRSA Fisheries.

- Scope relevant recreational fisheries education opportunities with PIRSA Fisheries.

- Rising sea level under climate change

- Review old interpretive signage, upgrade and place at lookout areas along track.

N/A All of EAP

Consultation with SA Tourism Commission Target Tourism SA strategies

Consultation with SA Tourism Commission at officer and executive level is needed to progress any tourism related initiatives which could be developed.

Scope the potential for nature-based tourism opportunities and events in the Samphire Coast area

Develop Coastal Ambassador Training Program for tourism operators / stakeholders to develop interpretative opportunities or guided/educational tours.

Short

Operating

cost

AMLR,

DEWNR, SA Tourism Commission

Future Marine Park Zoning of Upper Gulf St Vincent in 2012 could be seen as a negative by recreational users

L N/A

Majority Zone A and off-shore

Consultation Community Education

Consult with Marine Parks SA and provide public comment on Marine Park zoning outcomes. Determine regulations / guidelines appropriate to the estuary.

Incorporate Marine Park zoning guidelines into web page information and interpretative signs. Objective is to increase public perception of the value of the estuary as a high conservation area (links to Public Education / Awareness actions).

Immediate

Operating

cost

AMLR,

DEWNR (Marine Parks)

-

-

Other

Shared Management Jurisdiction and lack of coordinated approached to management

H N/A N/A Foster involvement of community groups / stakeholders

Raise awareness of the value of the estuary through Public Education actions to increase public participation in volunteer initiatives (links to Public Education / Awareness actions).

Environment Mgt Advisory Group to secure funding and prioritise work plans to allocate to community groups for targeted management.

AMLR NRMB, DC Mallala and DEWNR crown lands to develop works program. Develop program to allow for involvement of Environmental community groups in priority restoration and weed control, monitoring and mapping activities. Suitable weed species for volunteer groups to assist with control include: African Boxthorn and Artichoke Thistle.

Co-ordinate a Clean-up Australia Day Community Event for Light Beach and Samphire Coast. Publicise through local media. Coordinate Clean up events with AMLR NMB current Marine Debris standing crop surveys that occur at Great Sandy beach and North Parham.

Foster partnerships with the Cheetham Salt and relevant indigenous groups to identify opportunities e.g. incorporate key messages in interpretive signage and publications,

Immediate

Operating

cost

AMLR, DCM (Env. Mgt.

Group), DEWNR,

CG, Cheetham

8.5 – To raise

public knowledge

and valuing of the saltmarsh area from Pt Adelaide to

Parham,

8.6 – Councils and AMLR to support local

coastcare groups and community

efforts

-

- N/A

All of EAP and

Propose formal protection of Samphire

Samphire Coast has been highlighted several times as meeting criteria to qualify as a RAMSAR site and East

Immediate

Operating

AMLR,

8.10 –

Obj. 1 –


16


timeframe

Cost estimate

Key Partners


Links to Draft

Samphire Objectives

wider region

Coast Asian–Australasian Flyway, but no recent formal proposal has been submitted (i.e. past 2000). Coordinate stakeholder consultation to determine best method of promoting Samphire Coast as a RAMSAR site (estuary is too small to be considered alone). Considerations:

- AMLR NRMB Coast, Estuary and Marine Advisory Committee (CEMAC) Meeting Number 30 (16 February 2012) endorsed the preparation of a discussion paper to assess options for further shorebird conservation measures and scope the feasibility of relevant shorebird habitats for addition to the East Asian-Australian Shorebird Site Network or potential for designation as a Wetland of International Importance.

- Undertake a current scoping report as part of the NRM Board and BirdLife Australia current shorebird project that reviews the above endorsement by CEMAC.

- Formal discussion with key state agency executives to enhance collaborative approaches

Liaise with DEWNR protected areas department to put forth cabinet submission to conserve Light River estuary (or larger part of Samphire Coast) under formal protection (i.e under National Parks & Wildlife Act 1972). Considerations:

- The area below the high water mark falls under DEWNR, and thus would require consultation if the trail was aligned over this area.

- Formal protection of the Light River Estuary under the National Parks & Wildlife Act could lead to increased surveillance opportunities via NWPS officers.

Investigate opportunities to incorporate landscape assessment in development plans and other relevant statutory processes

cost DEWNR (protected

areas), NPWS, BirdLife Australia

conserve Light River Delta

through establishment

of conservation

park

Creating a system of

inter-connected protected

areas including land

and marine based parks,

and RAMSAR site

Tracking progress of EAP - N/A All of EAP

Document progress, completed actions, and new issues to be addressed as they arise.

Update Excel version of management action table to reflect status of tasks and new actions. Incorporate into annual reporting.

Consult with Cheetham for works completed or newly identified management issues

Annually

Immediate

Operating cost

AMLR

AMLR,

Cheetham, DCM

-

-

Review of EAP - N/A All of EAP

Review works program and actions

Record and track progress relating to the key actions for the EAP, to identify completed tasks and priorities for the following year. This information can also form the basis for corporate reporting on DC Mallala achievements. Update plan annually in conjunction with DC Mallala (end of each financial year - July).

Consult with Cheetham for works completed or newly identified management issues at this time.

Review legislative changes, responsibilities and processes relating to land management and ensure these are incorporated into EAP actions

Annually

Operating

cost

AMLR, DCM,

Cheetham

-

-


17


timeframe

Cost estimate

Key Partners


Links to Draft

Samphire Objectives

A number of reports written focusing on Samphire Coast or estuary management, and forums held over the years regarding best management options. Antagonism in local community about the lack of action thus far to address EAP threats.

- N/A N/A

Review existing management plans / reports. Consult with DC Mallala

Review other mgt / action plans written for the Samphire Coast region and determine common themes / actions that may achieve mgt of the estuary also.

DC Mallala to review Draft Coast Samphire Strategy to endorse objectives for estuary management.

Align future DC Mallala strategic plans with Coast Samphire Strategy objectives and targets.

Short -

Medium term

Operating

cost

AMLR, DCM

-

-

Research - N/A N/A Support research

Provide in-kind support to research projects

Contact prospective Universities regarding research opportunities, e.g. sea-level rise and species assemblage changes / habitat loss (links to Climate Change actions).

Medium

Operating cost

AMLR,

Universities

-

-

Risk:

E = Extreme Risk: Requires immediate action, action within 3 months

H = High Risk: Senior Management Attention Needed, Budget Provision in next Financial Year

M = Medium Risk: Management responsibility must be specified

L = Low Risk: Manage by routine procedures

Map ID: refers to individual maps created for a management issue, as depicted in Part A.

Location: refers to management zone (see

Figure 1), and where applicable, the specific GPS location (WGS 84) of the issue.

Timeframe: immediate (requires action asap), ‘short term’ (1-3 years), ‘medium term’ (3-5 years), ‘long term’ (beyond 5 years), and ongoing.

Acronyms: AMLR: Adelaide Mt Lofty Ranges NRM Board. DCM: District Council of Mallala. DEWNR: Department for Environment, Water and Natural Resources. Cheetham: Cheetham Salt Limited. SARDI. South Australian Research and Development Institute. DPTI: Department of Planning, Transport and Infrastructure. SAPOL: South Australian Police. CG: Community Groups. DWLBC: Department of Water, Land and Biodiversity Conservation.

LIGHT RIVER ACTION PLAN Part B: Risk Assessment and … · 2017. 7. 14. · Light River Estuary...

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Transcript of LIGHT RIVER ACTION PLAN Part B: Risk Assessment and … · 2017. 7. 14. · Light River Estuary...