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Two input GIS layers can be used, these are the branch lines (channels) and cut lines (cross sections). The branch line is split into the 1d_nwk layer, a new 1D channel is created for each section. The GIS attributes of these are defined in the sections below.
===Branch Lines===
The branch lines are split into channels using the cross-section cut lines detailed below. A number of optionschannel characteristics can be set for the branch lines. AttributesThe forrequired theattributes and attribute data types for branch line are:
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