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<br /> <br />FOREWORD <br /> <br />~day, many concerns about the Nation's ground-water resources involve questions about their <br />future sustainability. The sustainability of ground-water resources is a function of many factors, including <br />depletion of ground-water storage, reductions in streamflow, potential loss of wetland and riparian <br />ecosystems, land subsidence, saltwater intrusion, and changes in ground-water quality. Each ground- <br />water system and development situation is unique and requires an analysis adjusted to the nature of the <br />existing water issues. The purpose of this Circular is to illustrate the hydrologic, geologic, and ecological <br />concepts that must be considered to assure the wise and sustainable use of our precious ground-water <br />resources. The report is written for a wide audience of persons interested or involved in the protection <br />and sustainable use of the Nation's water resources. <br /> <br /> <br />Charles G. Groat, Director <br />U.S. Geological Survey <br /> <br />III <br />