NJ Dept. of Environmental Protection, (NJDEP), NJ Geological Survey (NJGS)The 14-digit hydrologic units (HUC14s) in New Jersey is a revision of the 20110225 version of these units. This version corrects 290 overlapping topology errors which were extremely small and visually undetectable. The 14-digit hydrologic units (HUC14s) in New Jersey is a revision of the 2006 version of these units. This version corrects some boundaries to be consistent with a new hydrography coverage based on 1:2,400 aerial photographs (NJDEP, 2008). It also makes some changes to be more consistent with a new 12-digit hydrologic unit coverage (EPA, 2009). This editing process created 42 new HUC14s, deleted one inland HUC14 and five coastal HUC14s in the Delaware Bay, and changed over 100 boundaries. A report detailing these changes (Hoffman and Pallis, 2009) is available online . For programmatic reasons the 14-digit units are clipped to New Jersey's political boundary. HUC14 hydrologic units were first published by Ellis and Price (1995) and made available as a shape file by the New Jersey Department of Environmental Protection soon afterword. Watershed boundaries were based on elevations and water courses from 1:24,000-scale (7.5-minute) USGS quadrangles. These were revised (NJDEP, 2006) by clipping the unit boundaries to the official NJ state boundary and addition of some additional identification information. Some boundaries were changed at that time to reflect errors found in the original coverage. This product is an interim product and will be replaced once better elevational data are available. It is based on elevational data from quadrangle maps at a scale of 1:24,000. The hydrography is at 1:2,400. Once high-resolution LiDAR data (at 1:2,400 or better) become available for New Jersey the 14-digit hydrologic units will be redrawn and this interim coverage will be replaced. EPA's 12-digit hydrologic system (USEPA, 2009) uses a numbering convention that is not entirely consistent with the 14-digit numbering system. For some HUC14s, the first 12 digits do not match the identification number of the 12-digit hydrologic unit it lies within. These discrepancies will be corrected when the HUC14s are next revised.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/8de4c55bcf6540bcbe173df2b0552eb2_22engNew Jersey Department of Environmental Protection's (NJDEP) Bureau of GISPublic14 Digit Hydrologic Unit Code Delineations for New Jersey [New Jersey]Web servicesNew JerseyLast Modified: 2023-12-27