Title

Statewide Groundwater Flow Systems 

Alternate title

GFS1M 

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

Planned  

Horizontal Accuracy

250m  

Code

4283 

Maintenance and update frequency

As needed  

Title

ArcInfo GRID 2 

Topic category

• Inland waters

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  

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

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. 

Classification

Unclassified  

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: VIC_GFS (state GFS no.) Index only CMA_LIST (list of aggregated 1:250,000 regional GFSs) TITLE (GFS title) Index only COMMENT (additional note supporting the GFS description) GFS_PRIM (scale of dominant flow system) Informed by expert judgement GFS_SEC (scale of sub-dominant flow system) 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 LANDUSE (dominant landuse) General comment, informed by expert judgement GW_USE (groundwater use) General comment, informed by expert judgement AQ_TYPE (aquifer type) Informed by expert judgement AQ_COND (aquifer confinement) 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 RE_TEM (temporal recharge distribution) General comment, informed by expert judgement RE_SPA (spatial recharge distribution) General comment, 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 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