A serial number following the last letter is used to distinguish between wells located in the same 2.5-acre tract. The head value in each well. Head is equal to the altitude of land surface minus the water level. The arithmetic mean of multiple head values for the same well. Multiple head measurements exist when multiple water-level measurements were taken.
Unique code identifying the principal hydrogeologic unit the well is open to.
The accuracy of the measured latitude and longitude. When the accuracy was not known, the attribute was left blank. If a log was not available, the attribute was left blank. Compilation of this data set and the associated metadata was funded in cooperation with the South Dakota Department of Environment and Natural Resources and the West Dakota Water Development District. Joel Galloway U.S. Geological Survey hydrologist 1608 Mt. View Rd.