Environmental tritium in the Edwards Aquifer, central Texas 1963-71

Pearson, F.J.; Rettman, P.L.; Wyerman, T.A.

doi:10.3133/ofr74362

Cited by 13 publications

(14 citation statements)

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“…Ground water was traced by a dye for a distance of several miles parallel to the Medina Lake fault southwest of Medina Lake (C. L. R. Holt, Jr •• U.S. Geological Survey, retired, oral commun •• 1976). Investigations of the concentrations of tritium, an environmental tracer, support the interpretation that water moves toward the southwest in northern Medina County (Pearson, Rettman, and Wyerman, 1975).…”

Section: Ground-water Circulation and Rate Of Movementmentioning

confidence: 89%

“…(Most of these data have been presented in the following reports Maclay and Small, 1976;Pearson and Rettman, 1976;Pearson, Rettman, and Wyerman, 1975;Puente, 1975Puente, , 1976Puente, , and 1978and Small and Maclay, 1982. ) Subareas A through G ( fig.…”

Section: Hydrologic Properties Transmissivitymentioning

confidence: 99%

“…These reports describe the general geology and hydrology of the area and discuss the availability of ground water. Reports prepared as a part of this study, which began in 1970, include: Rettman (1972, 1973); ; Maclay and Small (1976) ;Rettman (1980, 1981); Pearson and Rettman (1976) ;Pearson, Rettman, and Wyerman (1975); Puente (1975Puente ( , 1976Puente ( , 1978and Small and Maclay (1982). Other reports related to the geology and hydrology of limestone aquifers are listed in the section "Selected References.…”

Section: Previous Investigationsmentioning

confidence: 99%

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Carbonate geology and hydrology of the Edwards Aquifer in the San Antonio area, Texas

Maclay¹,

Small²

1984

Open-File Report

244

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Section: Ground-water Circulation and Rate Of Movementmentioning

confidence: 89%

Section: Hydrologic Properties Transmissivitymentioning

confidence: 99%

Section: Previous Investigationsmentioning

confidence: 99%

See 1 more Smart Citation

Carbonate geology and hydrology of the Edwards Aquifer in the San Antonio area, Texas

Maclay¹,

Small²

1984

Open-File Report

244

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“…Ground-water hydrology of the Randolph Air Force Base-San Antonio area has been reported by Arnow (1959Arnow ( , 1963, Garza (1962), Pearson et al (1975), Baker and Wall (1976), Maclay and Small (1976) USBR ( The rock is characterized by an extensively honeycombed, cavernous structure created by solution channeling over wide areas.…”

Section: Hydrologymentioning

confidence: 94%

“…Ground-water flow directions are both to the south (downdip along formation gradients) and to the east-northeast paralleling the fault system and according to prevaling hydraulic gradients (Pearson, et al, 1975). The Canyon Lake Recreational Area has a well.…”

Section: Hydrologymentioning

confidence: 99%

Installation Restoration Program. Phase 1. Records Search, Randolph AFB, Texas

Thoem¹,

Absalon²,

Butner³

1985

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Drainage‐basin evolution and aquifer development in a karstic limestone terrain South‐Central Texas, U.S.A.

Woodruff

Abbott

1979

Earth Surf. Process.

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SUMMARYThe Edwards artesian aquifer occurs in cavernous limestones of Cretaceous (Albian) age within the Balcones fault zone in south-central Texas. The major recharge and discharge zones of the aquifer are contained within the upper reaches of three river systems: the Nueces, the San Antonio, and the Guadalupe. Within these watersheds, recharge dominates in the semiarid Nueces basin to the west while most discharge occurs farther east from wells in the subhumid San Antonio basin and from springs in the subhumid Guadalupe basin. This long-distance transfer of ground water (up to 240 km) is a result of several factors: depositional and early diagenetic history of the limestone host rock, geometry and magnitudes of fault displacement, and physiographic responses to faulting.The loci of greatest discharge from the aquifer occur in an area that was exposed subaerially with concomitant porosity enhancement due to dissolution of limestone during late Early Cretaceous time. This area also was subjected to the greatest fault displacement during Miocene time. Thus, faults and associated joints superimposed additional avenues for porosity and permeability development onto an area that already had considerable secondary porosity. Further determinants on aquifer properties resulted from late Tertiary and Quaternary drainage evolution in response to faulting along the Balcones trend. The strike of the fault zone lay at acute angles to the courses of the main trunk streams in the ancestral Guadalupe and San Antonio River systems, whereas in the Nueces basin the trend of the fault zone was normal to the courses of the main streams. Thus, as a fault-line scarp began to form in the eatern basins, scarp-normal streams were incised rapidly into northwest-trending canyons. These steep-gradient streams captured the eastward-flowing major streams in the easten watersheds. These pirate streams incised into the aquifer at the lowest topographic levels within the region because of: 1. The sudden acquisition of extensive catchment areas in a subhumid area; and 2. Steep stream gradients that reflected the larger fault displacement in the east. The low topographic points of discharge became the loci of major springs.Recharge is dominant in the Nueces basin mainly because streams cross permeable limestone units at higher topographic levels than in the San Antonio and Guadalupe basins. The topographic characteristics of the Nueces watershed resulted from a combination of diverse @,ctors: lesser fault displacement, no major stream piracy, and less vigorous erosion because of a semiarid climate.

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Environmental tritium in the Edwards Aquifer, central Texas 1963-71

Cited by 13 publications

References 0 publications

Carbonate geology and hydrology of the Edwards Aquifer in the San Antonio area, Texas

Carbonate geology and hydrology of the Edwards Aquifer in the San Antonio area, Texas

Installation Restoration Program. Phase 1. Records Search, Randolph AFB, Texas

Drainage‐basin evolution and aquifer development in a karstic limestone terrain South‐Central Texas, U.S.A.

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