Regional Groundwater Flow Systems

dataset: GFS250
Groundwater Flow Systems (GFS) have been developed in the National Land and Water Resources Audit as a framework for dryland salinity management in Australia. Originally developed in a broad national context, GFS has since been applied at the Murray Darling Basin scale and consequently CMA scale to support and underpin the development of salinity management strategies across regional jurisdictions. GFS250 joins the mapping for the Victorian CMAs where a GFS framework has been developed, and presents a statewide map with a consistent attribute set. The GFS framework encompasses: (a) identification of generalised conceptual models of groundwater behaviour in each of the region's geological and geomorphic provinces, (b) an assessment of the physical attributes of each system, and (c) first order consideration of potential salinity management strategies applicable within each GFS. A GFS will exhibit similar physical characteristics across its extent, and generally incorporate the complete groundwater flow path from recharge to discharge. Central to the framework is the assessment of the hydrogeological responsiveness of a GFS that guides appropriate land use to assist in the management of salinity. The development GFS framework for a region is typically undertaken through intense workshopping involving local expertise, then this documented in a regional GFS map and accompanying report. The linking of regional GFSs into GFS250 was undertaken by PIRVic and funded through NAP.
 
Citation proposal Citation proposal
(2021)

Regional Groundwater Flow Systems

Department of Primary Industries
 

Simple

 
 

Description

Title
Regional Groundwater Flow Systems 
Alternate title
GFS250 
Purpose
GFS250 captures, orders and presents landscape and hydrogeological knowledge to inform the management opportunities to deal with salinity in such landscapes. 
Supplemental Information
History: Credit: Phil Dyson, Phil Dyson & Associates, Senior Hydrogeologist, 54422631 Ray Evans, Salient Solutions Peter Dahlhaus, Dahlhaus Environmental Geology, Senior Environmental Geologist, 53413994 John Leonard, John Leonard Consulting Service Darrel Brewin, Darrel Brewin & Associates Mark Reid, PIRVic Bendigo David Heislers, PIRVic Bendigo, Hydrogeologist, 54304319 Xiang Cheng, PIRVic Frankston In addition to the above, anyone who has participated in regional GFS workshops and documentation. Relationship to other Datasets: GFS boundaries are based on a range of digital layers including geology (typically GEOL250) and elevation/slope (DEM25 or equivalent), in addition to the occasional manually ascribed boundary. Current Design Issues: A principal task has been to apply consistency across each CMA GFS framework in order to produce a statewide product with (i) minimal discontinuity across CMA boundaries, and (ii) consistently reported attributes. This layer will develop as remaining CMAs develop GFS frameworks, or as new knowledge becomes available. Future Design Issues: As land management implications become more precise and definitive these could be incorporated as a series of additional layer attributes Related Documents: None 
Status
Under development  
 
 

Temporal

 
 

Spatial

Horizontal Accuracy
250m  
Code
4283 
 
 

Maintenance

Maintenance and update frequency
As needed  
 
 

Format

Title
ArcInfo GRID 2 
 
 

Contacts

  Point of contact

Cited responsible party  

No information provided.

Cited responsible party  

No information provided.

Cited responsible party  

No information provided.
 
 

Keywords

Topic category
  • Inland waters
  • Environment
  • Geoscientific information
 
 

Resource Constraints

Use limitation
Access restricted to Departmental staff/CMA staff only. Data not to be used beyond a CMA or regional policy context. Contact data.vsdl@dse.vic.gov.au for external data supplies. Data not to be used beyond a CMA or regional policy context Developed with a number of stakeholders/organisations, these need to be acknowledged. Including the following: Phil Dyson, Phil Dyson & Associates Ray Evans, Salient Solutions Peter Dahlhaus, Dahlhaus Environmental Geology John Leonard, John Leonard Consulting Service Darrel Brewin, Darrel Brewin & Associates Mark Reid, PIRVic Bendigo David Heislers, PIRVic Bendigo Xiang Cheng, PIRVic Frankston along with those who participated in the regional GFS workshops. 
Classification
Limited Distribution  
 
 

Lineage

Statement
Dataset Source: Primary and derived. Attribute data often translated from knowledge of other similar areas, or estimated from expert judgement. GFS boundaries and attributes initiated in workshops, and completed out of session using expert knowledge (tacit knowledge and literature). Dataset Originality: Primary & Derived 
Description
Collection Method: GFS boundaries and attributes initiated in workshops 
Description
Source description not available 
Description
Source description not available 
Description
Source description not available 
Description
Source description not available 
Description
A number of data layers have been used in developing the groundwater flow systems. In some CMA regions GFS boundary construction assisted by applying slope/elevation rules and/or spatial buffers. GFS boundaries and attributes were initiated in workshops and completed out of seesion using expert knowledge. 
 
 

Metadata Constraints

Classification
Unclassified  
 
 

Quality

Attribute Quality
Comments
Attributes used to describe a groundwater flow system include catchment, soil and landform, hydrogeological and salinity characteristics. Attribute values or comments are generally determined in workshops (and associated follow-up), from expert judgement and observation. Judgements are based on previously documented knowledge, tacit knowledge and from logical extrapolation. No quantification of certainty is provided. All attributes below are presented in character fields, consistent with the descriptive and semi-quantitative nature of this information: CMA_GFS (CMA GFS no.) Index only VIC_GFS (state GFS no.) Index only TITLE (GFS title) Index only GFS_PRIM (scale of dominant flow system) Informed by expert judgement GFS_SEC (scale of sub-dominant flow system) Informed by expert judgement TY_AREA (type/reference area) Informed by expert judgement FLO_DIST (flow system length) Indicative, informed by expert judgement CAT_SIZE (groundwater catchment size, Ha) Indicative, informed by expert judgement GEOLOGY (geological units) Determined by overlaying mapped polygons REGOLITH (regolith material) General comment, informed by expert judgement LANDFORM (geomorphological unit) Determined by overlaying mapped polygons; expert judgement ANN_RF (annual rainfall, mm) Determined by overlaying isohyets LANDUSE (dominant landuse) General comment, informed by expert judgement NAT_VEG (pre-existing vegetation) General comment, informed by expert judgement GW_USE (groundwater use, uS/cm) General comment, informed by expert judgement AQ_TYPE (aquifer type) Informed by expert judgement AQ_COND (aquifer confinement) Informed by expert judgement AQ_SAL (aquifer salinity) Indicative value/range, informed by expert judgement AQ_K (aquifer permeability, m/d) Indicative value/range, informed by expert judgement AQ_TRANS (aquifer transmissivity, m2/d) Indicative value/range, informed by expert judgement AQ_SY (aquifer specific yield, %) Indicative value/range, informed by expert judgement AQ_HGRAD (horizontal groundwater gradient) Indicative value/range, informed by expert judgement RE_TEM (temporal recharge distribution) General comment, informed by expert judgement RE_SPA (spatial recharge distribution) General comment, informed by expert judgement RE_RATE (recharge rate) Indicative value/range, informed by expert judgement DIS_OCC (discharge occurrence) Comment, informed by general observation SAL_REG (salt store in regolith) General comment, informed by expert judgement SAL_SOIL (soil salinity rating) Comment, informed by general observation SAL_EFF (salinity impacts) Comment, informed by general observation SAL_EXP (salt export mechanism) Comment, informed by general observation SAL_LOAD (stream salt load level) Comment, informed by general observation RISK_L (land salinity risk) General comment, informed by expert judgement RISK_W (water salinty risk) General comment, informed by expert judgement RISK_ASS (assets at risk to salinity) Comment, informed by general observation RESPONSE (responsiveness to land management) General comment, informed by expert judgement 
Positional Accuracy
Comments
Dependent upon accuracy of underlying geological mapping and DEM. At scale of application of this data layer (regional rather than local) accuracy is sufficient. 
Conceptual Consistency
Missing Data
Comments
Completed for Glenelg-Hopkins, Corangamite, Port Phillip, Wimmera, North Central, Goulburn-Broken and North East CMAs Completeness Verification: Spatial coverage and attributes are not reviewed beyond compilation of individual CMA GFS products 
Excess Data
Comments
Attributes are either descriptive comment, descriptive class or indicative values/range. Descriptive classes usually relate to the extent or rapidity of a parameter, and are therefore exhaustive 
 
 

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