HydroEdges represent the blue lines (streams) on a traditional topographic map, plus linear features that flow through and connect waterbodies such as lakes, 2D rivers, and wetlands to the stream network. HydroEdge was originally populated using the high resolution National Hydrography Dataset (NHD), in particular the NHDFlowline feature class, but has subsequently been extensively updated by SJRWMD staff. * Types of HydroEdges are defined by the field NHDFType: StreamRiver, CanalDitch, ArtificialPath, Connector, Pipeline, and Coastline. ArtificialPath and Connector are features whose purpose is to continue the connectivity of the geometric network through waterbody and river polygons - places where the blue lines on a traditional topographic map disappear. * HydroEdge is part of the SJRWMD Water Resources Geodatabase (WRGDB), which is based on the ArcHydro data model. It is one of the two core layers that define the geometric network in the WRGDB. However, it can also be used independently as a simple 1:24,000 stream dataset, by only drawing StreamRiver and CanalDitch features. * The HydroEdge layer also contains unique IDs for each feature. HydroCode is the SJRWMD HydroEdge ID. NHDComID is the original ID from the NHD, however, as features are edited, the integrity of NHDComID may be compromised, and we do not guarantee that the value is correct. * Date of last update: December 2013.