Geologic map of the Edwards Aquifer recharge zone, south-central Texas

Blome, Charles D.; Faith, Jason R.; Pedraza, Diana E.; Ozuna, G.B.; Cole, James C.; Clark, Allen L.; Small, T.A.; Morris, Robert R.

doi:10.3133/sim2873

Cited by 5 publications

(4 citation statements)

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“…The hydrologic functioning of the structures is therefore highly complex and variable and depending on many factors. Inspection of the geologic maps prepared by Hanson and Small (1995), Small et al (1996), andBlome et al (2005), and a compilation of top of Edwards Aquifer data values (Hunt BB, written communications, 2010) do not indicate an obvious occurrence of any major structural discontinuity in the vicinity of Kyle that could be a barrier to groundwater flowing northeast along the flow zone. In fact, the study area occupies a transfer (step-over) zone between 2 large-displacement, northeast-striking fault zones, approximately in the area mapped as the Kyle and Mountain City/ Mustang Branch faults.…”

Section: Geologic Structuresmentioning

confidence: 94%

“…As discussed earlier, at least part of the cause for the cone of depression near Kyle is related to local pumping. A study of geologic framework maps prepared by Hanson and Small (1995), Small et al (1996), and Blome et al (2005) and a compilation of top of Edwards Aquifer data values by Hunt BB (written communications, 2009) do not indicate the occurrences of any major blockage to groundwater flow by major faults (Fig. 14).…”

Section: Droughtmentioning

confidence: 95%

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Hydrologic Connectivity in the Edwards Aquifer between San Marcos Springs and Barton Springs during 2009 Drought Conditions

Land¹,

Hunt²,

Smith³

et al. 2011

Texas Water Journal

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A study of water level data collected during the 2009 drought was conducted to determine if there is a hydrologic connection between the San Antonio segment and Barton Springs segment of the Edwards Aquifer. These results showed con-tinuity in the direction of groundwater flow along a preferential groundwater flow zone from San Marcos Springs to Barton Springs during the drought. Using a USGS MODFLOW model, the flow passing San Marcos Springs and flowing toward Bar-ton Springs was estimated at about five cfs. Near the city of Kyle, major discontinuities in hydraulic gradient and water levels were evident, which indicate a zone of relatively low transmissivity. Southwest of Kyle, an area of nearly flat water levels exists and is believed to be a zone of high transmissivity. Faults do not appear to be a controlling factor between the zones of relatively high and low transmissivity nor blockage or conduits of groundwater flow. Rapid population growth and increased water demands suggests a continual groundwater level monitoring program between San Marcos Springs and Buda to provide data for future local and regional hydrogeologic analyses. Citation: LE Land, BB Hunt, BA Smith, PJ Lemonds. 2011. Hydrologic connectivity in the Edwards Aquifer between San Marcos Springs and Barton Springs during 2009 drought conditions. Texas Water Journal. 2(1):39-53. Available from: https://doi.org/10.21423/twj.v2i1.1951.

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Section: Geologic Structuresmentioning

confidence: 94%

Section: Droughtmentioning

confidence: 95%

Hydrologic Connectivity in the Edwards Aquifer between San Marcos Springs and Barton Springs during 2009 Drought Conditions

Land¹,

Hunt²,

Smith³

et al. 2011

Texas Water Journal

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“…The western section of the San Antonio Pool is recharged by the Dry Frio, Frio, and Sabinal River watersheds in addition to recharge from the Uvalde Pool via the Knippa Gap. Early assessments of the geology, hydrology, and water resources of the western San Antonio Pool by the U.S. Geological Survey (i.e., Holt, 1956;Maclay and Small, 1984;Maclay and Land, 1988;Maclay, 1995) have been augmented with more focused recent studies on geologic structure (Small and Clark, 2000;Blome et al, 2005Blome et al, , 2007Green et al, 2006;Clark et al, , 2009Pantea et al, 2008), groundwater flow paths (Clark and Journey, 2006;Green et al, 2006Green et al, , 2009aGreen et al, , 2009bGreen et al, , 2012b, and water balance (Lambert et al, 2000;Slattery and Miller, 2004;Okerman, 2005;Pedraza and Okerman, 2012;Green et al, 2012b;Fratesi et al, 2015) to develop a conceptual model of the western San Antonio Pool (Fig. 2).…”

Section: Western San Antonio Poolmentioning

confidence: 99%

San Antonio Pool of the Edwards (Balcones Fault Zone) Aquifer

Green¹,

Bertetti²,

Fratesi³

et al. 2019

The Edwards Aquifer: The Past, Present, and Future of a Vital Water Resource

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The Edwards (Balcones Fault Zone) Aquifer in central Texas is typically defined as having three segments: the San Antonio, the Barton Springs, and the Northern segment, which are separated by groundwater divides or points of discharge. The San Antonio segment of the Edwards Aquifer is defined as extending from east of Brackettville in the west to Hays County in the east. The San Antonio segment has been further delineated into two pools, the San Antonio Pool and the Uvalde Pool, for water management purposes. The San Antonio Pool is the larger of the two pools and is recharged by the Dry Frio, Frio, Sabinal, Medina, Cibolo, Guadalupe, and Blanco River watersheds, in addition to direct recharge and flow from the Uvalde Pool via the Knippa Gap. To a lesser extent, interformational flow between units stratigraphically above and below the Edwards Formation limestone also occurs. The most prominent points of discharge from the San Antonio Pool are Comal, San Marcos, and Hueco Springs. San Pedro and San Antonio Springs in Bexar County discharge during periods of high stage in the aquifer. There are limited numbers of additional springs in the Frio River watershed with limited discharge. Significant water is discharged from the Medina Lake and Diversion Lake (downstream from Medina Lake dam) system via conduits and surface flow to recharge paleo-alluvial deposits (Leona Gravel) in the Medina River floodplain. This discharge had previously been assumed to recharge the Edwards Aquifer, but it continues downgradient in the Leona Gravel and is lost to the aquifer.

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“…North of UTM Northing 3252000 in Figure 2, the Frio River flows across the outcrop of units comprising the Edwards Group and the Edwards Aquifer in Uvalde County. The outcrop of these units has been identified as the recharge zone of the Edwards Aquifer (Blome et al 2005). The Edwards Group and adjacent Cretaceous rocks dip gently (∼1%) to the south‐southeast and are offset by south‐dipping normal faults along the Balcones Escarpment.…”

Section: Background On the Frio River And Edwards Aquifermentioning

confidence: 99%

Estimating Aquifer Channel Recharge Using Optical Data Interpretation

Walter¹,

Necsoiu

McGinnis

2011

Groundwater

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Recharge through intermittent and ephemeral stream channels is believed to be a primary aquifer recharge process in arid and semiarid environments. The intermittent nature of precipitation and flow events in these channels, and their often remote locations, makes direct flow and loss measurements difficult and expensive. Airborne and satellite optical images were interpreted to evaluate aquifer recharge due to stream losses on the Frio River in south-central Texas. Losses in the Frio River are believed to be a major contributor of recharge to the Edwards Aquifer. The results of this work indicate that interpretation of readily available remote sensing optical images can offer important insights into the spatial distribution of aquifer recharge from losing streams. In cases where upstream gauging data are available, simple visual analysis of the length of the flowing reach downstream from the gauging station can be used to estimate channel losses. In the case of the Frio River, the rate of channel loss estimated from the length of the flowing reach at low flows was about half of the loss rate calculated from in-stream gain-loss measurements. Analysis based on water-surface width and channel slope indicated that losses were mainly in a reach downstream of the mapped recharge zone. The analysis based on water-surface width, however, did not indicate that this method could yield accurate estimates of actual flow in pool and riffle streams, such as the Frio River and similar rivers draining the Edwards Plateau.

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Geologic map of the Edwards Aquifer recharge zone, south-central Texas

Cited by 5 publications

References 0 publications

Hydrologic Connectivity in the Edwards Aquifer between San Marcos Springs and Barton Springs during 2009 Drought Conditions

Hydrologic Connectivity in the Edwards Aquifer between San Marcos Springs and Barton Springs during 2009 Drought Conditions

San Antonio Pool of the Edwards (Balcones Fault Zone) Aquifer

Estimating Aquifer Channel Recharge Using Optical Data Interpretation

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