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Abstract: Flowline data that are contained by a subbasin that overlaps the 16-county NCTCOG region. The data are extracted from the NHD. The NHD is a digital vector dataset that contains features such as lakes, ponds, streams, rivers, canals, dams and stream gages. NHD Flowlines dataset consists of routes that make up a linear surface water drainage network. Flowlines have a reach code and a measure, allowing for the establishment of upstream/downstream relationships.