The CFEV Catchments data layer shows the boundaries of catchment boundaries within the major drainage catchments in Tasmania. It is part of a set of nested catchments for the state which reduce in size from the major catchments to sub-catchments to fine-scale river section catchments.

The CFEV Catchment spatial data layer was created by aggregating CFEV River Section Catchments until they resembled the Land and Water Management Catchments commonly used by water managers and scientists within Tasmania. Some boundaries may vary slightly at a fine scale of viewing. The River Section Catchment data layer was developed in conjunction with the CFEV Rivers spatial data layer as part of an overall catchment model. Specific details of this model can be found in the CFEV Project Technical Report (http://dpipwe.tas.gov.au/water/water-monitoring-and-assessment/cfev-program/cfev-resources#TheCFEVTechnicalReport). Limitations: In cases where a catchment on mainland Tasmania is located adjacent to a large offshore island (e.g. Montagu and Robbins Island, Derwent and Bruny Island), the two areas may be spatially joined and/or joined by their attributes. For example, the catchment polygon for the Derwent Estuary-Bruny catchment consists of two regions â¿¿ the area on mainland Tasmania flowing into the Derwent estuary, south of Bridgewater and Bruny Island. Spatially it exists as a multi-part polygon and has all attributes relating the two areas combined (e.g. total area stated is the sum of the two regions). Currency: The mapping of the major catchments for the CFEV Program was completed and released in 2005. Completeness: The CFEV Catchments data set is complete for all Tasmania excluding Macquarie Island.