Digital hydraulic conductivity valuesEntry ID: USGS_ofr96-446_cond
Abstract: This data set was created for a project to develop data sets to support
ground-water vulnerability analysis. The objective was to create and document a
digital geospatial data set from a published report or map, or existing digital
geospatial data sets that could be used in ground-water vulnerability analysis.
This data set consists of digital hydraulic conductivity values for the
alluvial and ... terrace deposits along the Beaver-North Canadian River from the
panhandle to Canton Lake in northwestern Oklahoma. Ground water in 830 square
miles of the Quaternary-age alluvial and terrace aquifer is an important source
of water for irrigation, industrial, municipal, stock, and domestic supplies.
The aquifer consists of poorly sorted, fine to coarse, unconsolidated quartz
sand with minor amounts of clay, silt, and basal gravel. The hydraulically
connected alluvial and terrace deposits unconformably overlie the Tertiary-age
Ogallala Formation and Permian-age formations.
Six zones of ranges of hydraulic conductivity values for the alluvial and
terrace deposits reported in a ground-water modeling report are used in this
data set. The hydraulic conductivity values range from 0 to 160 feet per day,
and average 59 feet per day.
The features in the data set representing aquifer boundaries along geological
contacts were extracted from a published digital surficial geology data set
based on a scale of 1:250,000. The geographic limits of the aquifer and zones
representing ranges of hydraulic conductivity values were digitized from folded
paper maps, at a scale of 1:250,000 from a ground-water modeling report.
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
Data Set Citation
Dataset Originator/Creator: Adams, Gregory P.; Runkle, Donna; Rea, Alan
Dataset Title: Digital hydraulic conductivity values
Dataset Series Name: Open-File Report
Dataset Release Date: 1997-01-01
Dataset Release Place: Oklahoma City, OK
Dataset Publisher: U.S. Geological Survey
Data Presentation Form: map
Start Date: 1981-01-01Stop Date: 1981-01-01
Latitude Resolution: 64 meters
Longitude Resolution: 64 meters
Quality Although this data set has been used by the U.S. Geological Survey, U.S.
Department of the Interior, no warranty expressed or implied is made by the
U.S. Geological Survey as to the accuracy of the data and related materials.
Use Constraints Lines representing geological contacts were extracted from the digital geology
data set by Cederstrand (1996), based on a scale of 1:250,000. Lines
representing the geographic limits of the aquifer were digitized from a folded
paper map (30 inches by 22 inches) at a scale of 1:250,000 from Davis and
Christenson (1981, plate 7). The lines digitized ... from the source map had a
maximum registration root-mean-squared-error (RMSE) of 0.018 map inches (0.046
centimeters) or 377.76 feet (115.14 meters) ground distance. Boundaries
represented at these scales are indicative of broad, regional trends and should
not be interpreted as site specific. 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. The hydraulic conductivity and recharge are closely interrelated. As
long as these two model inputs are in balance the model has a small mean
residual; it represents the natural system numerically. If the hydraulic
conductivity is accurately known, the model can be used to accurately determine
recharge. Likewise, if the hydraulic conductivity is poorly known, then the
recharge will be poorly determined. 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. In most aquifers, hydraulic conductivity measurements made in wells or in
cores will range over several orders of magnitude, even over short horizontal
and vertical distances. Hydraulic conductivity values derived from ground-water
flow models represent areas generalizations and do not reflect the large local
variance in well or core measurements.
Data Set Progress
Role: DIF AUTHOR
Email: dlrunkle at usgs.gov
202 NW 66th St., Bldg. 7
City: Oklahoma City
Province or State: Oklahoma
Postal Code: 73116
Country: UNITED STATES OF AMERICA
Cederstrand, J.R., 1996, Digital geologic map of Woodward quadrangle,
northwest Oklahoma: U.S. Geological Survey Open-File Report 96-381, based on a scale of 1:250,000, 2 diskettes. (Available in nonproprietary and ARC/INFO
Davis, R.E. and Christenson, S.C., 1981, Geohydrology and numerical simulation of the alluvium and terrace aquifer along the Beaver-North Canadian River from the panhandle to Canton Lake, northwestern Oklahoma: U.S. Geological Survey
Open-file Report 81-483, 42 p., 15 pl.
Environmental Systems Research Institute, Inc. (ESRI), 1995, ARC/INFO
Command Reference, ARC/INFO On-line manuals: Redlands, CA.
Creation and Review Dates
DIF Creation Date: 2003-09-09
Last DIF Revision Date: 2006-10-12