Age of Imperviousness
Impervious surface by estimated date of conversion. Used to estimate level of current stormwater treatment.
Flow Duration Index
Dimensionless index indicating level of flow control needed to match forest hydrology.
HSPF Land Cover Type
Land cover classified by categories used in HSPF/WWHM
Hydrologic Response Units
Units of common soils, land cover, and slope used in continuous simulation modeling.
Imperviousness
Percent impervious land cover
Land Cover
1-meter resolution land cover classification
Land Use
Department of Commerce Master Land Use Category
Pollutant Concentration
Predicted Pollutant Concentration
Pollutant Load
Predicted Mean Annual Pollutant Load
Population Density
2010 Census, population density
Precipitation
Mean annual precipitation (1970-1999)
Runoff
Mean annual runoff calculated through continuous simulation for the period 1970-1999.
Slope
Continuous ground surface slope in degrees
Slope Categories
Categorized ground surface slope
Soils
Hydrologic Soil Group
Traffic
Mean Annual Average Daily Trips