Ground water of the Piedmont and Blue Ridge provinces in the Southeastern States

LeGrand, Harry E.

doi:10.3133/cir538

Cited by 50 publications

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“…In the Blue Ridge province, McMaster and Hubbard (1970) and LeGrand (1967) determined that the chances of drilling high-producing wells are increased at sites having a thick cover of regolith in relatively low topographic positions within a few hundred feet of a fault zone. The broad valleys underlain by carbonate rocks, such as Cades Cove in the Great Smoky Mountains National Park, may be favorable sites for locating ground-water supplies.…”

Section: Occurrence Of Ground Watermentioning

confidence: 99%

Summary appraisals of the nation's ground-water resources – Tennessee region

Zurawski¹

1978

Professional Paper

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Section: Occurrence Of Ground Watermentioning

confidence: 99%

Summary appraisals of the nation's ground-water resources – Tennessee region

Zurawski¹

1978

Professional Paper

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“…Although the water table can be positioned in bedrock, the saturated zone more typically extends upward into the regolith (LeGrand, 1967). Thus, an unsaturated zone and saturated zone are within the regolith, and the saturated zone includes part of the regolith, as well as the bedrock.…”

Section: Piedmontmentioning

confidence: 99%

“…The areal extent of most individual fractures in bedrock is less than a few hundred feet, although some fracture zones can extend for several miles (Richardson, 1980). Estimates of the maximum depth of water-bearing fractures are 300 ft (Richardson, 1980), 400 ft (LeGrand, 1967), and 800 ft (Heath, 1989).…”

Section: Piedmontmentioning

confidence: 99%

“…The shape of the water table generally follows the land surface, and the slope of the water table and direction of ground-water flow generally follow the topographic slope (LeGrand, 1967). From the water table, water flows downward because of gravity and laterally to streams and generally does not cross topographic divides (Richardson, 1980).…”

Section: Piedmontmentioning

confidence: 99%

“…Because stream networks are closely spaced in the Piedmont, many separate local ground-water flow systems are present (LeGrand, 1967). Perennial stream basins define specific ground-water flow cells that generally are separate from surrounding cells, although some deeper regional flow systems could cover larger areas (Harned, 1989).…”

Section: Piedmontmentioning

confidence: 99%

See 2 more Smart Citations

Ground-water flow, geochemistry, and effects of agricultural practices on nitrogen transport at study sites in the Piedmont and Coastal Plain physiographic provinces, Patuxent River basin, Maryland

1997

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Tritium in ground water of the georgia piedmont: Implications for recharge and flow paths

Rose

1992

Hydrological Processes

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Environmental tritium was measured in 33 natural water samples representative of precipitation, stream runoff, and groundwater (derived principally from production wells) within the Georgia Piedmont Province. Major ion analyses were used to assist in the interpretation of the tritium results. Tritium concentrations were significantly greater within shallow groundwater derived from the regolith (28-34 TU) and stream runoff (25-30 TU) than within recent rainfall (4-17 TU). Based upon the decay-corrected tritium input function, this probably indicates that at least some of the shallow water is stored within the regolith for a period of approximately 25 years.A 'post-bomb' component of recharge was present in all groundwater derived from production wells in the study area. Groundwater sampled from the bedrock aquifers was commonly less tritiated than either stream runoff or shallow water stored in the regolith. The lower tritium concentrations may have resulted from the mixing of 'pre-bomb' water stored within the fractures or the transitional zone directly above the bedrock and modern water stored in the shallow regolith. The preponderance of modern water provides evidence that groundwater flow paths are areally restricted within this setting, probably confined to local surface water drainage basins. The residence time of groundwater in the Piedmont is limited by the lack of deep, gravity-driven regional flow and the localized vertical flow induced by pumping. The results of this study indicate that relatively small tritium concentration variations (10-20 TU) may have regional hydrological significance in the southeastern Piedmont Province and similar settings.

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Ground water of the Piedmont and Blue Ridge provinces in the Southeastern States

Cited by 50 publications

References 0 publications

Summary appraisals of the nation's ground-water resources – Tennessee region

Summary appraisals of the nation's ground-water resources – Tennessee region

Ground-water flow, geochemistry, and effects of agricultural practices on nitrogen transport at study sites in the Piedmont and Coastal Plain physiographic provinces, Patuxent River basin, Maryland

Tritium in ground water of the georgia piedmont: Implications for recharge and flow paths

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