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Goulburn Broken Catchment Management Strategy

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Regional Catchment Strategy 2013-2019

Appendix five: Social-ecological system thresholds

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The following thresholds are expected to be important considerations when making decisions within SESs.  These thresholds are expected to vary within different landscapes of each SES.


 

Level of rigour in evidence

Description

Level 1

Experiential evidence, expert panel etc

Level 2 (+Level 1)

Documented internal evidence – grey literature etc

Level 3 (+Levels 1&2)

Peer reviewed literature collated and reviewed

Level 4 (+Levels 1,2&3)

Peer reviewed literature reviewed and synthesized

Level of rigour in evidence

Description

Level 1

Experiential evidence, expert panel etc

Level 2 (+Level 1)

Documented internal evidence – grey literature etc

Level 3 (+Levels 1&2)

Peer reviewed literature collated and reviewed

Level 4 (+Levels 1,2&3)

Peer reviewed literature reviewed and synthesized

Level of rigour in evidence

Description

Level 1

Experiential evidence, expert panel etc

Level 2 (+Level 1)

Documented internal evidence – grey literature etc

Level 3 (+Levels 1&2)

Peer reviewed literature collated and reviewed

Level 4 (+Levels 1,2&3)

Peer reviewed literature reviewed and synthesized

Threshold parameter

Socio-ecological System

1

Agricultural Floodplains

2

Productive Plains

3

Upland slopes

4

Commuting Hills

5

Southern Forests

6

Urban Centres

Native vegetation

Riparian width (from top of bank)

>30 m (1)

>50 m (3)

40 m (3)

>30 m (1)

Riparian corridor width

tbd

Patch size

>3 ha (1)

10- 40 ha (3)

40 ha (3)

Patch size for species groups of concern

>40 ha (3)

Vegetation condition (structural and compositional integrity and appropriate disturbance regimes) for species of concern

>thresholds (1)

Fire frequency

To maintain safety and vegetation communities species and sturctural diversity (tbd)

To maintain vegetation communities species and sturctural diversity (tbd)

Structural diversity

tbd (2)

Connectivity gaps, including roadsides and riparian strips, for species of concern

<40m (3)

Linked remnants (habitat hectare score)

35 (1)

35 (1)

Extent:  negative

<10% (3)

Extent:  positive

>30% (3)

Rocky outcrops native grass and herb cover

<30% (1)

Remnant quality (habitat hectare score)

<35; >60 (1)

Threatened species

Threatened species populations

> viability thresholds (tbd?)

viability thresholds (tbd?)

Agricultural viability

Land available for irrigated agriculture

Area tbd (1)

Water available for irrigated agriculture and associated food processing

Volume tbd (1)

Viability of agricultural properties outside of future irrigation footprint

tbd (1)

Watertables

Watertable depths following rainfall events

< 2 m (3)

Area of SIR with high watertables

% (2)

Productivity losses (if drainage works incomplete)

10% (2)

Water regime

Flood regime (timing, frequency, extent and duration) for maintaining waterways and wetlands communities

Nil identified

Flood regime (timing, frequency, extent and duration) for maintaining Red Gum communities

tbd

Productive and social capacity??

Productive capacity and community long term impact

Drought frequency and length (1)

Flood severity

 - social and economic impact (related to timing, extent and duration of flooding) (tbd)

Community contributions

Volunteer base decline (2)

Permanent/absentee ownership ratio

tbd (1)

Community cohesion for cross boundary/tenure issues

social capital measures (tbd)

Water quality

Nitrogen, phosphorus, salts and sediment

< critical levels (3)

Riparian width for filtration

>50 m (2)

Riparian zone condition for filtration

tbd

Fire regime

tbd??

Fire regime

Uncontrolled bushfire

tbd

Bushfires beyond current fire suppression capacity

tbd

Built environment and floods

Land or properties impacted by floods within each urban community

Proportion of land or number of properties (tbd)

Costs of floods (social and economic)

tbd