National Water-Quality Assessment (NAWQA) Program

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Modeling and Software
General Information

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.

Geology/Soils

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

Land

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

Hydrologic Variables

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

Physical Measures

Chemical

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

Stream network and catchments

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Page Last Modified: Tuesday, 04-Mar-2014 14:44:04 EST