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Quality controlling your data
RivEX requires your river network to be topologically correct for it to successfully process. Various errors can occur when a network is created and/or updated.
RivEX provides a set of quality controls which you can run on your network. The output of a quality control is a dBase or text file identifying the polylines which failed the quality control. It is then up to you, the user, to correct your data.
Zero (null) length polylines
Small polylines composed of two vertices
Double digitised polylines
Sources within a network
RivEX also provides a tool for automatically removing self-intersections
More advice is given in the manual
about dealing with these errors: