| Variable |
Units |
Source |
| Treated
with agricultural herbicides |
Proportion
of segment shed |
USDA
NRCS 1987 agricultural census |
| Estimated
soil loss from segment shed |
Tons
per hectare per year |
USDA
NRCS |
| Excess
manure leaching potential |
Index |
USDA
NRCS |
| Excess
manure runoff potential |
Index |
USDA
NRCS |
| Excess
N fertilizer leaching potential |
Index |
USDA
NRCS |
| Excess
N fertilizer runoff potential |
Index |
USDA
NRCS |
| Est.
pesticide leaching from segment shed |
Pounds
per hectare per year |
USDA
NRCS |
| Est.
pesticide runoff from segement shed |
Pounds per hectare per year |
USDA
NRCS |
| Segment
rank for pesticide and N leaching |
Rank |
USDA
NRCS |
| Segment
rank for erosion, pesticide, and N runoff |
Rank |
USDA
NRCS |
| Amount
of sediment delivered to streams |
Tons
per hectare per year |
USDA
NRCS |
| Average
amount of all N fertilizers applied |
Tons
per square mile |
USGS |
| Average
amount of all P fertlizers applied |
Tons
per square mile |
USGS |
| Average
amount of potash applied |
Tons
per square mile |
USGS |
| Area
with animal facility nutrient treatment applied |
Proportion |
USDA
NRCS Performance and Results Measurement System |
| Total
N export by water from segment |
Kg
per square km per year |
USGS
NAWQA SPARROW |
| N
export from fertilizer into streams |
Kg
per square km per year |
USGS
NAWQA SPARROW |
| N
export from livestock waste into streams |
Kg
per square km per year |
USGS
NAWQA SPARROW |
| P
export from fertilizer into streams |
Kg
per square km per year |
USGS
NAWQA SPARROW |
| P
export from livestock waste into streams |
Kg
per square km per year |
USGS
NAWQA SPARROW |
| Total
P export by water from segment |
Kg
per square km per year |
USGS
NAWQA SPARROW |
| Variable |
Units |
Source |
| Distance
to nearest Area of Concern |
Kilometers |
US
EPA GLNPO |
| Population
density in the segment shed |
Number
per sq km |
US
Census Bureau 2002 Census |
| Amount
of developed land in the segment shed |
Proportion
of segment shed |
USDA
NRCS |
| Percent
change in lacustrine emergent wetland area (1982-1992) |
Proportion
of segment shed |
USDA
NRCS NRI |
| Percent
change in lacustrine non-vegetated wetland area (1982-1992) |
Proportion
of segment shed |
USDA
NRCS NRI |
| Percent
change in palustrine emergent wetland area (1982-1992) |
Proportion
of segment shed |
USDA
NRCS NRI |
| Percent
change in palustrine forested wetland area (1982-1992) |
Proportion
of segment shed |
USDA
NRCS NRI |
| Percent
change in palustrine non-vegetated wetland area (1982-1992) |
Proportion
of segment shed |
USDA
NRCS NRI |
| Percent
change in palustrine shrub-scrub wetland area (1982-1992) |
Proportion
of segment shed |
USDA
NRCS NRI |
| Density
of freeways in segment shed |
Km
per square km |
US
Census Bureau TIGER |
| Density
of highways in segment shed |
Km
per square km |
US
Census Bureau TIGER |
| Density
of local roads in segment shed |
Km
per square km |
US
Census Bureau TIGER |
| Total
road density in segment shed |
Km
per square km |
US
Census Bureau TIGER |
| Density
of trails in segment shed |
Km
per square km |
US
Census Bureau TIGER |
| Variable |
Units |
Source |
| Density
of mines in segment |
Number
per km of shoreline |
USGS |
| Density
of mine processing plants in segment |
Number
per km of shoreline |
USGS |
| N
export from nonagricultural sources into streams |
Kg
per square km per year |
USGS
NAWQA SPARROW |
| N
export from point sources into streams |
Kg
per square km per year |
USGS
NAWQA SPARROW |
| P
export from nonagricultural sources into streams |
Kg
per square km per year |
USGS
NAWQA SPARROW |
| P
export from point sources into streams |
Kg
per square km per year |
USGS
NAWQA SPARROW |
| Facilities
discharging chlorinated compounds in wastewater (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Facilities
discharging non-PAH hydrocarbons in wastewater (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Facilities
discharging metals in wastewater (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Facilities
discharging nutrients in wastewater (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Facilities
discharging PAHs in wastewater (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Facilities
discharging particulates in wastewater (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Facilities
discharging pathogens in wastewater (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Facilities
discharging pharmaceuticals in wastewater (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Facilities
discharging salts in wastewater (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Facilities
discharging solvents in wastewater (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Facilities
that physically disturb the landscape (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Sewerage
system facilities (5 facilities categories) |
Number
(total, major, minor, active, and inactive) per segment shed area
(hectares) |
US EPA NPDES |
| Powerplant
carbon dioxide emissions |
Tons
per year |
USGS |
| Powerplant
nitrogen oxide emissions |
Tons
per year |
USGS |
| Powerplant
sulfer dioxide emissions |
Tons
per year |
USGS |
| Coal-fired
powerplant density in segment |
Number
per km of shoreline |
USGS |
| Gas-fired
powerplant density in segment |
Number
per km of shoreline |
USGS |
| Hydroelectric
powerplant density in segment |
Number
per km of shoreline |
USGS |
| Nuclear
powerplant density in segment |
Number
per km of shoreline |
USGS |
| Oil-fired
powerplant density in segment |
Number
per km of shoreline |
USGS |
| Density
of facilities discharging into the air |
Number
per segmentshed area (hectares) |
US
EPA TRI |
| Density
of facilities discharging onto the land |
Number
per segmentshed area (hectares) |
US
EPA TRI |
| Density
of facilities discharging into public water treatment plants |
Number
per segmentshed area (hectares) |
US
EPA TRI |
| Density
of facilities discharging into underground injection wells |
Number
per segmentshed area (hectares) |
US
EPA TRI |
| Density
of facilities discharging into surface waters |
Number
per segmentshed area (hectares) |
US
EPA TRI |
| Variable |
Units |
Source |
| Amount
of cultivated cropland |
Proportion
of segment shed |
USDA
NRCS |
| Amount
of grazing land |
Proportion
of segment shed |
USDA NRCS |
| Amount
of non-cultivated cropland |
Proportion
of segment shed |
USDA NRCS |
| Amount
of pasture and hay |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of orchards and vineyards |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of row crops |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of small grains cropland |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of bare rock, sand, and clay |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of mines, quarries, and gravel pits |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of open water |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of Great Lakes |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of evergreen forest |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of deciduous forest |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of mixed forest |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of shrubland |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of transitional land |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of herbaceous wetlands |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of woody wetlands |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of grasslands and herbacious lands |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of commercial, industrial and transportation land |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of urban and recreational grasslands |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of high intensity residential land |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Amount
of low intensity residential land |
Proportion
of segment shed |
USGS
National Land Cover Dataset |
| Variable |
Units |
Source |
| Average
available water capacity of soil (min, max, mean) |
Inches
per inch |
STATSGO |
| Bulk
density of soil (min, max, mean) |
Grams
per cubic centimeter |
STATSGO |
| Average
cation exchange capacity of soil (min, max, mean) |
Unitless |
STATSGO |
| Average
percent clay in soil (min, max, mean) |
Proportion
for segment shed |
STATSGO |
| Average
percent sand in soil (min, max, mean) |
Proportion
of segment shed |
STATSGO |
| Area
with excessively well drained soil |
Proportion
of segment shed |
STATSGO |
| Area
with moderately well drained soil |
Proportion
of segment shed |
STATSGO |
| Area
with somewhat excessively drained soil |
Proportion
of segment shed |
STATSGO |
| Area
with well drained soils |
Proportion
of segment shed |
STATSGO |
| Area
with somewhat poorly drained soil |
Proportion
of segment shed |
STATSGO |
| Area
with poorly drained soil |
Proportion
of segment shed |
STATSGO |
| Area
with soil poorly to very poorly drained |
Proportion
of segment shed |
STATSGO |
| Area
with soils very poorly drained |
Proportion
of segment shed |
STATSGO |
| Amount
of hydric soils |
Proportion
of segment shed |
STATSGO |
| Amount
of non-hydric soils |
Proportion
of segment shed |
STATSGO |
| Area
with muck, peat, mucky peat, or mucky sand soil |
Proportion
of segment shed |
STATSGO |
| Area
with fine sandy soil |
Proportion
of segment shed |
STATSGO |
| Area
with fine sandy loam soil |
Proportion
of segment shed |
STATSGO |
| Area
with gravel in a loam soil |
Proportion
of segment shed |
STATSGO |
| Area
with gravel or cobble in a silt soil |
Proportion
of segment shed |
STATSGO |
| Area
with loamy soil |
Proportion
of segment shed |
STATSGO |
| Area
with loamy fine sand soil |
Proportion
of segment shed |
STATSGO |
| Area
with loam sand soil |
Proportion
of segment shed |
STATSGO |
| Area
with sandy soil |
Proportion
of segment shed |
STATSGO |
| Area
with sandy loam and coarse sandy loam soil |
Proportion
of segment shed |
STATSGO |
| Area
with very fine sandy loam soils |
Proportion
of segment shed |
STATSGO |
| Area
with silty clay loam soils |
Proportion
of segment shed |
STATSGO |
| Area
with silty soil |
Proportion
of segment shed |
STATSGO |
| Area
with silty clay and clay soils |
Proportion
of segment shed |
STATSGO |
| Area
with cobbles, boulders, or stones in some type of loam soil |
Proportion
of segment shed |
STATSGO |
| Area
with other soil types (bedrock, variable soils, sapric soils, channery,
and flaggy soils) |
Proportion
of segment shed |
STATSGO |
| Rock
free erodibility factor of soil |
Unitless |
STATSGO |
| Average
depth to bedrock (min, max) |
Centimeters |
STATSGO |
| Average
organic matter in soil (min, max, mean) |
Proportion
by weight |
STATSGO |
| Average
permeability of soil (min, max, mean) |
Inches
per hour |
STATSGO |
| Average
amount of rocks greater than 3 inches in soil (min, max, mean) |
Proportion
of segment shed |
STATSGO |
