The 6-Digit Hydrologic Units, a component of the Watershed Boundary Dataset (WBD), depict the third level hydrologic subdivision of the United States. A 6-digit hydrologic unit may subdivide a 4-digit hydrologic unit or may be equivalent. There are 401 6-digit … Continued
The 8-Digit Hydrologic Units, a component of the Watershed Boundary Dataset (WBD), depict the fourth level hydrologic subdivision of the United States. A hydrologic unit can accept surface water from upstream drainage areas and may define a drainage area with … Continued
The 10-Digit Hydrologic Units, a component of the Watershed Boundary Dataset (WBD), depict the fifth level hydrologic subdivision of the United States. A hydrologic unit can accept surface water from upstream drainage areas and may define a drainage area with … Continued
Forest Productivity – Top Species/Tree Types depicts the most productive tree species or type based on soil characteristics.
Surface Percent Organic Matter shows the percentage of the surface layer of soil that is comprised of plant and animal residue.
Surface Texture is based on the composition of sand, silt, and clay in the surface layer of soil based on the standard soil triangle definition.
Slope Gradient, depicting the steepness of the landscape by soil type, has been updated to the October 2019 NRCS SSURGO data release.
Flooding Frequency, based on soil characteristics, has been updated to the October 2019 NRCS SSURGO data release. Note there is a change to the legend used to depict the data in this update.
Drainage Class, which classifies how quickly water is removed from the soil, has been updated to the October 2019 NRCS SSURGO data release.
Soil Loss Tolerance, a measure of how much soil can be lost per year without impacting production, has been updated to the October 2019 NRCS SSURGO data release. Note there is a change to the legend used to depict the … Continued