GROUND-WATER CONDITIONS IN GEORGIA, 1999

U.S. Geological Survey Open-File Report 00-151

Photo: Well 33E116 at the Naval Submarine Base Kings Bay, Camden County, Georgia, being pumped at approximately 30 gallons per minute. Photograph by Alan M. Cressler

• Preface
• Vertical datum
• Abstract
• Introduction
  • Purpose and scope
  • Georgia well-identification numbering system
  • Hydrologic unit codes
• Ground-water resources
• Ground-water levels
  • Surficial aquifers
    • Northern area
    • Southwestern area
    • Coastal area
  • Upper Brunswick aquifer
  • Floridan aquifer system
    • Upper Floridan aquifer
      • Southwestern area
      • South-central area
      • East-central area
      • Savannah area
      • Jesup-Doctortown area
      • Brunswick area
      • St Marys-Okefenokee Swamp area
    • Lower Floridan aquifer in the Glynn County area
  • Gordon aquifer system
  • Claiborne aquifer
  • Clayton aquifer
  • Cretaceous aquifers and aquifer systems
    • Providence aquifer
    • Dublin aquifer system
    • Midville aquifer system
    • Dublin-Midville aquifer system
  • Paleozoic-rock aquifers
  • Crystalline-rock aquifers
• Chloride concentration in water from the Floridan aquifer system
  • Savannah area
  • Brunswick area
• Selected references

  Observation wells for which hydrographs are included in this report:

  • Listed by county (Table 3a)
  • Listed by aquifer (Table 3b)
  • Listed by well identification number (Table 4)

PREFACE

Georgia Department of Natural Resources
    Environmental Protection Division
        Georgia Geologic Survey
Albany Water, Gas, and Light Commission
City of Brunswick
Glynn County

Robert J. Allen		Mark S. Reynolds
Nancy L. Barber		Welby L. Stayton
John M. McCranie		William T. Tharpe
Kristen B. McSwain		Debbie Warner
Sherlyn Priest		Caryl J. Wipperfurth

Data used in this report may be obtained upon request from the U.S. Geological Survey.

VERTICAL DATUM

ABSTRACT

Chloride concentration in water from the Upper Floridan aquifer in most of coastal Georgia was within drinking-water standards established by the Georgia Department of Natural Resources and the U.S. Environmental Protection Agency. In the Savannah area, chloride concentration has not changed appreciably with time. However, chloride concentration in water from some wells that tap the Floridan aquifer system in the Brunswick area exceeds the drinking-water standards.

INTRODUCTION

As part of the ground-water investigations conducted by the U.S. Geological Survey (USGS), in cooperation with the State of Georgia and city and county governments, a Statewide water-level-measurement program was started in 1938. Initially, this program consisted of an observation-well network in the coastal area of Georgia to monitor variations in ground-water storage and quality. Additional wells were later included in areas where data could be used to aid in water resources development and management.

During 1999, periodic water-level measurements were made in 46 wells, and continuous water-level measurements were obtained from 165 wells. Continuous water-level records were obtained using analog (pen and chart) recorders and electronic data recorders that record the water level at 60-minute intervals. For wells having incomplete water-level record, water levels during periods of missing record may have been higher or lower than recorded water levels. Water samples collected from 85 wells during May, June, July, August, September, October, November, and December 1999 were analyzed to determine chloride concentration in the Savannah and Brunswick areas.

Purpose and Scope

This report presents selected ground-water-level and ground-water-quality data for Georgia for calendar year 1999 and for the period of record. Graphs showing ground-water levels in 130 wells are presented. Graphs show chloride concentrations in water collected from 14 wells tapping the Floridan aquifer system in the Savannah and Brunswick areas. The text includes a brief discussion of the aquifers and aquifer systems, ground-water levels, and chloride concentration in water. An extensive list of references of water-resources investigations are presented in "Selected References;" previously published reports on Georgia ground-water conditions are listed in table 1.

Table 1. Previous reports on ground-water conditions in Georgia
[USGS, U.S. Geological Survey]

Georgia Well-Identification Numbering System

Wells described in this report are given an identification number according to a system based on the USGS index of topographic maps of Georgia. Each 7.5-minute topographic quadrangle in the State has been assigned a three to four-digit number and letter designation (example, 07H, 11AA) beginning at the southwestern corner of the State. Numbers increase sequentially eastward and letters advance alphabetically northward. Quadrangles in the northern part of the State are designated by double letters; AA follows Z, and so forth. The letters "I", "O", "II", and "OO" are not used. Wells inventoried in each quadrangle are numbered consecutively, beginning with 01. Thus, the fourth well inventoried in the 11AA quadrangle is designated 11AA04.

Hydrologic Unit Codes

The hydrologic unit is a geographic area representing part or all of a surface drainage basin or distinct hydrologic feature as delineated by the USGS, Office of Water Data Coordination, on state hydrologic unit maps; each hydrologic unit is identified by an 8-digit number.

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