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This dataset represents a stream network (centreline) of features both natural and artificial across NSW, classified using the Strahler Stream Order method, undertaken by the Department in 2013.<\/p>

This is a legacy, best endeavours dataset based upon a static (2012) copy of the now NSW Department of Customer Services (DCS) | Spatial Services: NSW Hydro Line. Today this data forms part of the NSW Digital Topographic Database and NSW Foundation Data Framework administered by DCS.<\/p>

Classification of the stream network was completed using the 'RivEX' tool (www.rivex.co.uk<\/a>) in combination with ESRI ArcMap by the Departments Geospatial practitioners.<\/p>

The dataset was initially broken up roughly the 13 Catchment Management Authority boundaries (as at 2012). This was simply a data size management step, and the catchment boundaries generally followed hydrology. The edges of the subsets were checked, so the hydro lines stayed within the correct subset for water flow.<\/p>

These catchments were often further broken down into smaller hydrological sub-catchments if the dataset remained to large. There were issues with the RivEx processing time if there were too many features processed at once. Checks were done to make sure no line appeared in more than one subset.<\/p>

Catchment subsets were processed in order of stream flow, so the order at the end of one catchment was used as the beginning of any it flowed into.<\/p>

For Victorian and Queensland datasets - any streamlines that flowed into NSW waterways were extracted (by complete catchment) and processed in exactly the same way as the NSW hydrolines data. Queensland was processed first so the Strahler results could be incorporated in the northern catchments of the state. Victoria was done before the Murray &amp; LMD areas in case those Strahler numbers were going to impact the Murray River stream order.<\/p>

 A summarised workflow is provided below: <\/p>