clay.extent: Extent of Clay Unit

In USGS-R/wrv: Wood River Valley Groundwater-Flow Model

Description

Estimated extent of the clay confining unit (aquitard) separating the unconfined aquifer from the underlying confined aquifer in the Wood River Valley aquifer system.

Usage

clay.extent

Format

An object of SpatialPolygonsDataFrame class containing 2 Polygons. Geographic coordinates are in units of meters, in conformance with the North American Datum of 1983 (NAD 83), and placed in the Idaho Transverse Mercator projection (IDTM).

Source

Extent defined by Moreland (1977, fig. 3 in USGS Open-File report). Moreland (1977) shows an outlier by Picabo that is assumed to indicate confined conditions in the basalt and not the lake sediments.

References

Moreland, J.A., 1977, Ground water-surface water relations in the Silver Creek area, Blaine County, Idaho: Boise, Idaho Department of Water Resources, Water Information Bulletin 44, 42 p., 5 plates in pocket, accessed January 31, 2012. Also published as U.S. Geological Survey Open-File report 77-456, 66 p., available at https://pubs.er.usgs.gov/publication/ofr77456.

Examples

sp::plot(clay.extent, col = "#FDC086", border = NA)
sp::plot(alluvium.extent, add = TRUE)
str(clay.extent)

USGS-R/wrv documentation built on June 30, 2020, 11:07 p.m.