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 "description": "This is a raster dataset representing the boundaries Fairfax County Potential Wetlands Areas. Applicants for many plan types are required to certify that all required wetlands permits will be acquired before land disturbance begins in a \u201cwetlands statement\u201d. This data can assist property owners and plan preparers in preliminary identification of potential wetlands for which such permits would be necessary. \n\nApplicants for Site Plans must complete the \u201cPotential for Wetlands\u201d information box on the site plan cover sheet.  This data is referenced as the \u201cCounty Potential Wetland Area Map\u201d referred to by the site plan cover sheet. \n\nLandowners and plan preparers should use this information in preliminary phases of projects to identify the need for further study of possible wetlands. This data does not replace the need for site-specific RPA delineation when required by code and does not replace other field analysis required when wetlands permits are necessary from the Army Corps of Engineers.  \n\nThese areas were classified as Potential Wetlands by intersecting the following datasets:  \n\nLess than 5% Slope: The 2009 Digital Elevation Model (DEM) was reclassified from 5ft to 10ft resolution. The slope tool was then used to locate areas in the DEM with less than 5ft slope.   \n\nHydric Soils: The Hydric Soils were identified in the 2018 Soils Map by Northern Virginia Soil & Water Conservation District. \n\nOnce these areas of intersection were determined the last step in the process was to remove the impervious surface. Impervious surface was accessed as follows:  \n\nImpervious Surface: The assessment of impervious surface was derived using a combination of 2009 Planimetric Data and 2015 Landcover Data. The 2015 Landcover Data is the base layer for the assessment but does not consider tree canopy over impervious.  The 2009 planimetric impervious surface was used to identify the areas of tree canopy over impervious and reclassify as impervious surface.   \n \n",
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