Digital data sets that describe aquifer characteristics of the Antlers aquifer in southeastern Oklahoma

This data set consists of digitized polygons of a constant
hydraulic conductivity value for the Antlers aquifer in
southeastern Oklahoma. The Early Cretaceous-age Antlers
Sandstone is an important source of water in an area that
underlies about 4,400-square miles of all or part of Atoka,
Bryan, Carter, Choctaw, Johnston, Love, Marshall, McCurtain, and
Pushmataha Counties. The Antlers aquifer consists of sand, clay,
conglomerate, and limestone in the outcrop area. The upper part
of the Antlers aquifer consists of beds of sand, poorly cemented
sandstone, sandy shale, silt, and clay. The Antlers aquifer is
unconfined where it outcrops in about an 1,800-square-mile area.

The hydraulic conductivity polygons were developed from the
hydraulic conductivity value used as input into a ground-water
flow model and from published digital data sets of the surficial
geology of the Antlers Sandstone except in areas overlain by
alluvial and terrace deposits near streams. Some of the lines
were interpolated where the Antlers aquifer is overlain by
alluvial and terrace deposits. The interpolated lines are very
similar to the aquifer boundaries shown on maps published in a
ground-water modeling report for the Antlers aquifer. The
constant hydraulic conductivity value used as input to the
ground-water flow model was estimated as 5.74 feet per day.

Ground-water flow models are numerical representations that
simplify and aggregate natural systems. Models are not
unique; different combinations of aquifer characteristics may
produce similar results. Therefore, values of hydraulic
conductivity used in the model and presented in this data set
are not precise, but are within a reasonable range when
compared to independently collected data.