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Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States (DS-490)

Climate

These data sets represent the average for each climatic variable for NHDPlus catchments in the conterminous United States.

• Average Annual Precipitation, (1971-2000)
• Annual Precipitation, (2002)
• Average Daily Annual Minimum Temperature, (1971-2000)
• Average Daily Annual Maximum Temperature, (1971-2000)
• Annual Daily Minimum Temperature Celsius, (2002)
• Annual Daily Maximum Temperature Celsius, (2002)

Geology/Soils

These data sets represent the area of each variable type in square meters compiled for NHDPlus catchments in the conterminous United States.

• Bedrock Geology
  
• Surficial Geology
• STATSGO Soil Data (cation exchange capacity, percent calcium carbonate, slope, water table depth, soil thickness, hydrologic soil group, soil erodibility (k-factor), permeability, average water capacity, bulk density, percent organic material, percent clay, percent sand, and percent silt)

Land

These data sets represent the estimated area of each variable type in square meters compiled for NHDPlus catchments in the conterminous United States.

• National Land Cover Dataset 2001
• Hydrologic Landscape Regions
• Level III EcoRegions
• Nutrient EcoRegions
• 2000 Population Density
• 2001 Percent Impervious Surface
• 2001 Percent Canopy
• Artificial Drainage - National Resource Inventory: Tile Drains, Ditches, Total Artificial Drainage and Irrigated Area
• Physiography

Hydrologic Variables

These data sets represent the average for each flow variable for NHDPlus catchments in the conterminous United States.

• Base Flow Index
• Recharge
• Contact Time
• Infiltration Excess Overland Flow
• Saturation Excess Overland Flow
• Mean Annual R-factor

Physical Measures

• Drainage area, Basin Shape Index, Sinuosity, Slope, Stream Density, Stream Length, Road Density

Chemical

These data sets represent the average or total of each variable compiled for NHDPlus catchments in the conterminous United States.

• Nutrients
• Nutrient and Phosphorous estimates for Fertilizer and Manure Applied to Crops
• 2002 Atmospheric Depostion
• Normalized Atmospheric Depostion 2002: NH4
• Normalized Atmospheric Depostion 2002: NO3
• Normalized Atmospheric Depostion 2002: Total N

Stream network and catchments

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U.S. Department of the Interior | U.S. Geological Survey
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Page Last Modified: Tuesday, 04-Mar-2014 14:44:04 EST