2008. Flood Plain Cross Sections are derived from hydrologic models and are used to create the flood plain boundary. They were originally compiled from t...
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1986. The regulatory floodplain boundary reflects the limits of flooding resulting from a storm having an occurrence probability of 1%, identified as the...
2002. The geodetic control points are the survey reference points registered with the National Geodetic Survey.
1. This layer represents 5000 feet by 5000 feet geodetic grid for Prince William County. .
2002. The dataset contains lines that designate the legal geographic boundaries between county, city and township jurisdictions within the outer boundari...
1999. "Bedrock" is one of four layers which collectively describe the subsurface geologic formation, structural geology and surficial deposits. "Bedrock...
1997. "Fault" is one of four layers which collectively describe the subsurface geologic formation, structural geology and surficial deposits. "Fault" is...
1999. "Structure" is one of four layers which collectively describe the subsurface geologic formation, structural geology and surficial deposits. "Struc...
1999. "Surficial" is one of four layers which collectively describe the subsurface geologic formation, structural geology and surficial deposits. "Surfi...
2006. This dataset represents the annotation for the individual polygons to display the geologic units in Arlington County, VA 2006.