Dataset: GLO Receptors 20151019

Description

Abstract

The dataset was derived by the Bioregional Assessment Programme from multiple source datasets. The source datasets are identified in the Lineage field in this metadata statement. The processes undertaken to produce this derived dataset are described in the History field in this metadata statement.

This dataset contains contains shapefiles and excel spreadsheets depicting the surface water (30), groundwater (192) and GDE (71) receptor locations for the Gloucester subregion.

It is identical to the 20150828 version except that River name, nested catchment area and total upstream catchment area has been added to the surface water receptor shapefile and/or spreadsheet.

Shapefiles and spreadsheets for the GDE and groundwater receptors are unchanged from last version and thus retain the previous datestamp

Dataset History

Receptors were derived as follows:

SURFACE WATER RECEPTORS:

21 of the surface water receptors were derived by location the catchment outflow locations of the Gloucester "Asset catchment" polygons. That is Asset polygons where Class = 'River or stream reach, tributary, anabranch or bend'. Outflow locations were determined by identifying the cell of maximum flow accumulation (using the GA 9sec d8 flow direction raster) within the catchment polygon. These were reviewed and some points were manually nudged to snap to the geofabric cartographic streamlines. The d8 derived points are identified in the data as Type = 'Catchment Outflow'

The remaining 9 SW receptors were manually located to capture points of interest, namely upstream and downstream of existing and proposed mining operations.

It is identical to the 20150828 version except that River name, nested catchment area and total upstream catchment area has been added to the surface water receptor shapefile and/or spreadsheet.

GROUNDWATER RECEPTORS:

The 192 groundwater receptors are derived from selected bore locations depicted in the the Assets DB, Element_points, namely where AssetList.M0 = 'Yes' AND AssetList.SubGroup = 'Groundwater management zone or area (surface area)' . Three notional bores (ElementID: _ECON_193, _ECON_194 & _ECON_195) from this selection are omitted to arrive at 192 Groundwater receptor locations.

GDE RECEPTORS:

GDE receptors are derived from the NSW Office of Water GDE dataset and were created as follows.

The 71 GDE receptors were located in groundwater dependent ecosystems, as identified by the NSW Office of Water (Kuginis et al. draft). Two criteria were used to identify suitable receptor locations. The following methodology was used to locate GDE receptors:

  1. The 3285 GDE polygons within the Gloucester PAE were reduced to 903 patches by combining contiguous polygons using the 'Dissolve' tool in ARCGIS 10.1.

  2. These patches were classified into those that lay above the alluvium (159) and those that did not lie above the alluvium (744).

  3. We selected patches larger than 4ha as representing more intact and higher ecological value patches of GDE outside of the alluvial zone; however, above the alluvium, where interaction between groundwater and vegetation was most likely, we selected patches that were as small as 1ha to locate receptors (see explanation below)

  4. Receptors were then located in the centroid of each patch using the 'Feature to Point (inside)' tool in ARCGIS 10.1.

Shapefiles and spreadsheets for the GDE and groundwater receptors are unchanged from last version and thus retain the previous datestamp

Dataset Citation

Bioregional Assessment Programme (2015) GLO Receptors 20151019. Bioregional Assessment Derived Dataset. Viewed 18 July 2018, http://data.bioregionalassessments.gov.au/dataset/4e440236-36e2-445e-8003-921701f3d110.

Dataset Ancestors

General Information

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