gdes matter; understanding the role that groundwater plays
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GDEs Matter; Understanding the role that groundwater plays in urban ecosystems in the Melbourne region (abstract 123).
Enabling rapid GDE assessments and referral
Overview
• Muddy waters
• Who’s who in the zoo?
• How urban development has grown.
• Stirring the waters
• Overview of Melbourne Water Program.
• Clearing the waters
• Implementation and examples using Merri Creek
Muddy Waters
Australia, Victoria and Melbourne
STREAM REFUGES
SALINE WETLANDSFRESHWATER WETLANDS
RIPARIAN WOODLANDS
BILLABONGSMINERAL SPRINGS
Who’s who in the zoo
• Urban Growth Authority –urban growth planning.
• Friends of Merri Creek –community group.
• Southern Rural Water –resource manager
• Melbourne Water –caretaker of river health
Environment Resources
Development Planning
Community
Future growth for Melbourne
Stirring the waters
Bill Moulden (MW)
Time Line
Pre 2010
No maps of groundwater interaction with ecosystems
No structure to assess their water requirements
No structure / policy to integrate them into management
Post 2010
GDE Atlas
-National map of potential GDEs
GDE Tool Box
-Approached to assessing the water requirements of GDEs
Melbourne Water GDE Management Plan
-established the way forward – how to manage GDEs within a Urban environment
MW GDE Management Program – Overview
How do we deliver the program?
Understand
Build our understanding and knowledge of GDEs
and actions required to protect and enhance them.
1 Identify GDE
• Investigation
• Proactive - priority GDEs
• Reactive - various investigation
GDE workspace and catalogue
Prioritisation of GDEs
Plan
Prioritise and guide our efforts to manage
GDEs.
2. Assess GDE.
If Yes - continue to next step
If No - update GDE catalogue (ewaterteam audit)
Desk top assessment
Field assessment
GDE handbook
GDE catalogue
Engage
Exchange knowledge and build support for action to protect and
enhance GDEs
3. Conceptual understanding
Role GW plays
Data gaps
Condition assessment
Detailed assessment
Conceptual model approach
GDE condition assessment
GDE catalogue
Deliver
Undertake actions to protect and enhance
GDEs
4. Management Plan
Management objectives
Local, catchment and regional scale.
Management Plan template and methodology
GDE catalogue
Program area
Aim
Process
Documents
Clearing the waters
The scenario
A new urban development / expansion or associated infrastructure
1. Increase in surface flow events – ephemeral to permanent stream flow
2. Potential reduction in infiltration / recharge
Melbourne Water are obliged to assess risk to GDEs
1. Interrogated existing data base on GDEs
2. Complete a desk top and field (rapid) assessment
3. Make recommendation within a referral process
1. Identify GDE – e.g Merri Creek
GDE Data base (already existing)
• GDEs – wetlands and drought refuge reach
• GDE gw catchments – depth to gw, time of travel
• Stream interaction – gaining & losing streams
GDE catalogue (already existing)
• Attributes align to national atlas
• Updateable as sites investigated
Urban boundary encompasses the creeks GW catchment
2. Plan
Assessment overview - Undertaken by a non GDE expert
Prescriptive approach
Next steps
Not GDE - Update catalogueYes GDE - Complete stage 3 detailed
assessment
Field visit
Complete stage 2 field assessment with GDE handbook
Update catalogue with learnings
Desktop study
Complete stage 1 Assesment Update catalogue with learnings
GDE identified
MW GDE workspace Previous Fieldwork BOM Atlas
2. Plan
Desk top assessment
Location details
Aerial photos
Info from MW data abase (catalogue)
• Hydrogeology/ Geology
• Depth to water table
• Groundwater catchment info
2. Plan
Desk top assessment
Location details
Aerial photos
Info from MW data abase (catalogue)
• Hydrogeology/ Geology
• Depth to water table
• Groundwater catchment info
2. Plan
Desk top assessment
Location details
Aerial photos
Info from MW data abase (catalogue)
• Hydrogeology/ Geology
• Depth to water table
• Groundwater catchment info
2. Plan
Desk top assessment
Location details
Aerial photos
Info from MW data abase (catalogue)
• Hydrogeology/ Geology
• Depth to water table
• Groundwater catchment info
2. Plan
Desk top assessment
Location details
Aerial photos
Info from MW data abase (catalogue)
• Hydrogeology/ Geology
• Depth to water table
• Groundwater catchment info
2. Plan
Field assessment
• Overview
• Location details
• Sketch map
• Key features of landscape
Supported by a GDE Field Guide
2. Plan
Handbook
• Identifies types of GDEs and GDE knowledge sources
• Observation guide for identifying GDEs in the field
• Conceptual models illustrating hydrogeological settings of GDEs
3. Engage
Conceptual model approach
• Standardised template that links to the National Framework and to the GDE catalogue.
• Undertake literature review.
• Undertake site visit with local experts/interest.
• Developed a A3 size document – able to be read in 10 odd minutes.
• Understood by different stakeholders
3. Engage
Merri Creek
Naturally Ephemeral
Zone of discharge of slightly saline and warmer groundwater
Saline water prevents a fungus from infecting the frogs
The proposed urban development will alter the stream (fresher), reduce GW discharge
Exposing the Growling Grass Frog to the fungus
4. Deliver
GDE Management Plans - Sets out management objectives.
• Recommendations for the new urban development :-
• Site e.g fence out the creek
• Urban development needs to consider surface flow management• Reduce pavement flow, onsite storage - maintain ephemeral
nature of creek• Consider managing infiltration and recharge – maintain
groundwater levels
Outcome
• The GDE management plan enables a rapid referral process for GDEs – Melbourne Water often only have several weeks to respond
• Communication – enabled consideration of the ecological importance of groundwater to be integrated into current management regimes of new developments.
• Still more to do….But a long way further than 5 years ago
GASKILL, S Melbourne Water, PO Box 4342, Melbourne 3001. Australia Sarah.Gaskill@melbournewater.com.auFAWCETT, J CDM Smith, 393 OttreyScrub Road Walmer 3463. Australia HEARD, S Jacobs, PO BOX 260, Tatura 3616. Australia Sheard@globalskm.com
GASKILL, S Melbourne Water, PO Box 4342, Melbourne 3001. Australia Sarah.Gaskill@melbournewater.com.auFAWCETT, J CDM Smith, 393 OttreyScrub Road Walmer 3463. Australia HEARD, S Jacobs, PO BOX 260, Tatura 3616. Australia Sheard@globalskm.com
Any questions take it up with my daughter
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