The South Carolina Department of Natural Resources (DNR) gathers ground-water level and water-quality for water-resources assessment and management. These data are used to identify long-term changes in ground-water levels and storage; to correlate climate conditions, streamflows, and ground-water levels; and to determine relationships between saltwater intrusion and water levels or stream stage. Ground-water data are collected through a network of DNR-maintained water-level and specific-conductance observation sites and through U.S. Geological Survey (USGS) maintained sites that are cooperatively funded by DNR or other agencies. Data are housed in DNR's database and updated regularly. The base DNR network includes 85 wells measured hourly or bimonthly to provide data for annual hydrographs. Most monitoring stations have been installed since 1999, although a number of stations have been in operation since 1995.

The water-level sensors used for automated monitoring stations include shaft encoders and pressure transducers whose readings are calibrated to manual measurements. Shaft encoders measure depth to water and consist of a pulley that is optically read or that controls a potentiometer, and a cable, float, and counterweight assembly. They have a rated accuracy and resolution of 0.01 ft. Pressure transducers measure the height of water above a semiconductor strain gage: electrical resistance to an input voltage, and therefore voltage output, change as varying water pressure deforms the crystalline lattice of the gage's silicon diaphragm (piezoresistive effect).

The statistical data for each of 85 observation sites are available on this web site. The data include average-daily measurements and corresponding values of monthly and yearly minimums, maximums, and means in feet above or below land surface datum. Average daily water levels are calculated for each day having 17 or more hourly measurements. Monthly means are calculated for each month having 5 or fewer days of missing record and all available monthly minimums and maximums are provided. Yearly statistics include the minimum, maximum, and mean for each calendar year having 10 or more months of record.


Disclaimer: Data presented on this web site may have been retrieved partially or entirely from several sources including federal or other state agencies. DNR makes every effort to provide accurate and complete information, however, the database is a "work in progress" and updates will occur regularly. In no event should the South Carolina Department of Natural Resources or any contributing agencies be liable for any direct or indirect, incidental, or other damages arising from the use of these data. DNR does not warrant, guarantee, or make any representations regarding the use, or the results of the use, of the information provided to you by the Department in terms of correctness, accuracy, reliability, timeliness or otherwise. The entire risk as to the results and performance of any information obtained from the DNR is entirely assumed by the recipient. DNR welcomes suggestions on how to improve our home page and correct errors. Please contact us at harders@dnr.sc.gov or tianf@dnr.sc.gov.