Description: Streams are linear surface water features. The streams layer is based on the National Hydrography Dataset (NHD) 1:100,000 scale streams network.
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Description: Water bodies are area surface features such as ponds, lakes and wide rivers. The water bodies layer is from U.S. Census Bureau TIGER/Line 2000.
Description: EPA defines a sole or principal source aquifer as an aquifer that supplies at least 50 percent of the drinking water consumed in the area overlying the aquifer. These areas may have no alternative drinking water source(s) that could physically, legally and economically supply all those who depend on the aquifer for drinking water. For convenience, all designated sole or principal source aquifers are referred to as "sole source aquifers" (SSAs).
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Description: This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the entire United States. Metadata
Copyright Text: U.S. Department of Agriculture, Natural Resources Conservation Service