Skip to main content
Advanced Search

Filters: partyWithName: Tyler Johnson (X) > partyWithName: U.S. Geological Survey - ScienceBase (X)

Folders: ROOT > ScienceBase Catalog > USGS Data Release Products ( Show direct descendants )

3 results (45ms)   

View Results as: JSON ATOM CSV
thumbnail
In this dataset we present two maps that estimate the location and population served by domestic wells in the contiguous United States. The first methodology, called the “Block Group Method” or BGM, builds upon the original block-group data from the 1990 census (the last time the U.S. Census queried the population regarding their source of water) by incorporating higher resolution census block data. The second methodology, called the “Road-Enhanced Method” or REM, refines the locations by using a buffer expansion and shrinkage technique along roadways to define areas where domestic wells exist. The fundamental assumption with this method is that houses (and therefore domestic wells) are located near a named road....
thumbnail
In this dataset we present two maps that estimate the location and population served by domestic wells in the contiguous United States. The first methodology, called the “Block Group Method” or BGM, builds upon the original block-group data from the 1990 census (the last time the U.S. Census queried the population regarding their source of water) by incorporating higher resolution census block data. The second methodology, called the “Road-Enhanced Method” or REM, refines the locations by using a buffer expansion and shrinkage technique along roadways to define areas where domestic wells exist. The fundamental assumption with this method is that houses (and therefore domestic wells) are located near a named road....
thumbnail
The U.S. Geological Survey (USGS) previously identified 62 Principal Aquifers (PAs) in the U.S., with 57 located in the conterminous states. The USGS characterized areas outside of PAs as “other rocks;” other rocks account for about 40% of the area of the conterminous states. This paper subdivides the large area identified as other rocks into Secondary Hydrogeologic Regions (SHRs). SHRs are defined as areas of other rock within which the rocks are of comparable geologic age, lithology, and relationship to the presence or absence of underling PAs or overlying glacial deposits. A total of 69 SHRs were identified. SHRs were identified in two phases. In the first phase, Other Rock Regions (ORRs) were defined as regions...
    map background search result map search result map Domestic well locations and populations served in the contiguous U.S.: 1990, Block-group method (BGM) map. Domestic well locations and populations served in the contiguous U.S.: 1990, Road-enhanced method (REM) map. Data Release for Secondary Hydrogeologic Regions of the Conterminous United States (ver. 2.0, June 2022) Domestic well locations and populations served in the contiguous U.S.: 1990, Block-group method (BGM) map. Domestic well locations and populations served in the contiguous U.S.: 1990, Road-enhanced method (REM) map. Data Release for Secondary Hydrogeologic Regions of the Conterminous United States (ver. 2.0, June 2022)