Australian Hydrological Geospatial Fabric - Surface Catchments

﻿ Abstract The Australian Hydrological Geospatial Fabric (Geofabric) identifies and registers the spatial relationships between important hydrological features such as watercourses, water bodies, canals, aquifers, monitoring points and catchments. Geofabric Surface Catchments provides a hierarchy of nested catchments from drainage divisions at the top level all the way down to a separate catchment for every stream segment in Geofabric Surface Network. Catchment boundaries derived from the 1 second Digital Elevation Model, with ~7 million base level catchments. The feature class contained within this data product is based upon the stream segment level catchments of the Catchment Boundary Vector - foundation input data. These data define a catchment for every stream segment contained within Geofabric Surface Network (AHGFNetworkStream) according to the 1 second DEM. It is these catchments which serve as direct input into the AHGF Catchment feature class. Surface Catchments define the base level of catchments for stream segments, sinks and coastal draining areas. Surface catchments are contiguous areas which, according to a flow direction grid, drain to a single stream segment. Universities, governments and consultants use these to identify contributing catchment areas. Australian Rivers, Lakes and water storages are all connected. The complex nature of our water system means that understanding these connections is vital for the effective management of water resources. The Geofabric is a specialised Geographic Information System. It is like a digital street directory of Australia's important water features. It lets you map how water is moved, used and stored throughout the landscape. It is an authoritative information source that works seamlessly across Australia. The Geofabric is made up of six datasets for use in hydrological visualisation, analysis and reporting. First up, the Hydrology reporting regions define Australia's drainage divisions and river regions. This is used for reporting by government and other organisations. Hydrology Reporting Catchments are the building blocks of reporting regions. They provide finer detail for smaller rivers. Surface Cartography lets you visualise surface water features such as canals and bridges. This context is great for water managers and emergency services, for example to anticipate downstream communities affected by floods. This is achieved in combination with the Surface Network which links streamflows that can connect when there are high water flows. Visualising these full networks helps with streamflow forecasting. You can trace these connected and directed stream networks and link them to Surface Catchments. This lets you identify the upstream contributing catchment area for a selected stream segment. Hydrologists use this to define networks and related catchments, and to inform environmental management and reporting. Groundwater Cartography shows groundwater resources and their features such as salinity as well as the rocks and sediments at different levels below the surface. This adds to the Geofabric’s detailed map of how our water system is connected. All information has been standardised across the country. This is why the Geofabric is widely used for streamflow analysis and the creation of customised catchments. Tutorials and a sample toolkit are available to help you perform common tasks. The Geofabric is continually being improved. Currency Date modified: 28 November 2022 Modification frequency: None Data extent Spatial extent North: -10.015416° South: -43.861528° East: 153.639028° West: 113.000139° Source information This dataset is derived from the Bureau of Meteorology's Geofabric dataset, in partnership with: * [Geoscience Australia], * The Australian National University [Fenner School of Environment and Society] and * [CSIRO Land and Water Flagship]. More information can be found at the [Geofabric Documentation] page. Lineage statement The Geofabric is an ongoing project which is the result of considerable effort and consultation by several agencies, both within Australia and internationally. The project is being led by the Bureau of Meteorology, in partnership with Geoscience Australia (GA), the Australian National University Fenner School of Environment and Society (ANU) and CSIRO Land and Water Flagship (CSIRO). The dataset presented here is a subset extracted from the national Geofabric Version 3.3 dataset. Data dictionary All layers ──────────────────────────────┬──────────────────────────────────────────────────────────────────────────────────────────────────────── Attribute name │Description ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Hydro ID │Geofabric feature identifier, unique across all geodatabases within an AHGF release ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── AHGF Feature Type │Feature type within the AHGF Data Model (e.g. 1: AHGFNetworkStream) ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── National Catchment Boundary ID│Unique NCB identifier. Can be used to join Pfafstetter attribution ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Segment No │Identifier of related raster stream segment in input data source ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Stream Name │Name of the associated stream segment in AHGFNetworkStream ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Next Down ID │The HydroID for the next downstream mapped node ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Source Feature Class Name │Feature class name from the input data source (e.g. Reservoirs) ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Source Feature Type │Feature type from the input data source (e.g. TownRuralStorage) ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Source Type │Feature subtype (numeric code) from the input data source (e.g. 2) ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Source ID │Unique identifier for individual feature in the input data source (e.g. 3023726) ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Feature Reliability │Reliability date of spatial object. Adjusted during spatial change/verification ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Feature Source │Name of agency that originally captured the spatial object ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Attribute Reliability │Reliability date of attribute object. Adjusted during attribute change/verification ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Attribute Source │Name of agency that originally captured the attribute object ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Planimetric Accuracy │Standard deviation of the horizontal positional accuracy in metres (e.g. 100) ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Symbol │No longer provided in Phase 3 input data. Was the symbol number for feature used in GA’s GEODATA product ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Text Note │Text note to accompany the feature ──────────────────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────── Contracted Catchment ID │The HydroID for a contracted catchment ──────────────────────────────┴──────────────────────────────────────────────────────────────────────────────────────────────────────── Contact Bureau of Meteorology, [ahgf@bom.gov.au]