| Title: |
Tracer Test Work Plan, Kinney and Uvalde Counties |
Description:
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Plan for dye tracer studies in Kinney and Uvalde Counties
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| Title: |
Review of Hydrocarbon Transmission Lines Crossing the Edwards Underground Reservoir |
Description:
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Risk assessment on the likelihood of leaks from oil pipelines over the Edwards Aquifer
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| Title: |
Appendix B A Report Investigating Impacts of Aquifer Pumping Limits on Flow of Comal Springs and San Marcos Springs |
Description:
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Use of GWSIM-IV model to determine effects of various pumpage reductions on springflow at Comal and San Marcos Springs
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| Title: |
Records of Precipitation, Aquifer Head, and Ground-Water Discharge to the Edwards and Associated Limestones, San Antonio Area, Texas, 1963 |
Description:
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Annual report for 1963 on precipitation, aquifer levels, and recharge to the Edwards Aquifer issued by the Edwards Underground Water District
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| Title: |
Records of Precipitation, Aquifer Head, and Ground-Water Recharge to the Edwards and Associated Limestones, San Antonio Area, Texas, 1965 |
Description:
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Annual report for 1965 on precipitation, aquifer levels, and recharge to the Edwards Aquifer issued by the Edwards Underground Water District
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| Title: |
Records of Precipitation, Aquifer Head, and Ground-Water Recharge to the Edwards and Associated Limestones, San Antonio Area, Texas, 1966 |
Description:
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Annual report for 1966 on precipitation, aquifer levels, and recharge to the Edwards Aquifer issued by the Edwards Underground Water District
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| Title: |
Records of Precipitation, Aquifer Head, and Ground-Water Recharge to the Edwards and Associated Limestones, San Antonio Area, Texas, 1967 |
Description:
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Annual report for 1967 on precipitation, aquifer levels, and recharge to the Edwards Aquifer issued by the Edwards Underground Water District
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| Title: |
Records of Precipitation, Aquifer Head, and Ground-Water Recharge to the Edwards and Associated Limestones, San Antonio Area, Texas, 1968 |
Description:
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Annual report for 1968 on precipitation, aquifer levels, and recharge to the Edwards Aquifer issued by the Edwards Underground Water District
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| Title: |
Records of Precipitation, Aquifer Head, and Ground-Water Recharge to the Edwards and Associated Limestones, San Antonio Area, Texas, 1969 |
Description:
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Annual report for 1969 on precipitation, aquifer levels, and recharge to the Edwards Aquifer issued by the Edwards Underground Water District
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| Title: |
Records of Precipitation, Aquifer Head, and Ground-Water Recharge to the Edwards and Associated Limestones, San Antonio Area, Texas, 1970 |
Description:
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Annual report for 1970 on precipitation, aquifer levels, and recharge to the Edwards Aquifer issued by the Edwards Underground Water District
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| Title: |
Records of Precipitation, Aquifer Head, and Ground-Water Recharge to the Edwards and Associated Limestones, San Antonio Area, Texas, 1972-73 |
Description:
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Annual report for 1972-73 on precipitation, aquifer levels, and recharge to the Edwards Aquifer issued by the Edwards Underground Water District
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| Title: |
Quantity and Quality of Low Flow in the Hondo Creek Basin, Texas March 27-28, 1968 |
Description:
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Low-flow study of Hondo Creek Basin, TX March 27-28, 1968
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| Title: |
Optimum Streamflow and Rainfall Gauging Site Location Study As Part of Real Time Data Collection Network Assessment |
Description:
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Streamflow and rainfall optimum gauging study and recommendations for improving accuracy of recharge estimates to the Edwards Aquifer
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| Title: |
Quality of Stormwater Runoff from an Urbanizing Watershed and a Rangeland Watershed in the Edwards Aquifer Recharge Zone, Bexar and Uvalde Counties, Texas, 1996-98 |
Description:
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Water quality study on stormwater runoff in an urbanizing vs rural area of the Edwards Aquifer Recharge Zone
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| Title: |
Helotes Mulch Fire 2006 Tracing Groundwater Flow Using Natural Fluorescent Materials |
Description:
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With approximately 21 million gallons of water (LFCI, 2011) having been trained on the debris pile, the Helotes mulch fire effectively became a tracer test of huge proportions. It provided an opportunity for us to study the karst-related flow characteristics of the Edwards and Trinity aquifers. The fire-fighting water mobilized naturally fluorescing woody material and products of combustion that could be measured in groundwater using conventional fluorescence spectroscopy. Results revealed many of the characteristics of karst in both aquifers.
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| Title: |
Edwards Aquifer Authority Well Plugging and Abandonment Study |
Description:
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Geophysical tests on an abandoned well to determine best method of achieving sealing of the annular space
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| Title: |
Evapotranspiration – A Method of Disposing of Septic Tank Effluent |
Description:
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Feasibility study for evapotranspiration as an effective means of disposing septic tank effluent
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| Title: |
Records of Precipitation, Aquifer Head, and Ground-Water Recharge to the Edwards and Associated Limestones, San Antonio Area, Texas, 1971 |
Description:
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Annual report for 1971 on precipitation, aquifer levels, and recharge to the Edwards Aquifer issued by the Edwards Underground Water District
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| Title: |
Records of Precipitation, Aquifer Head, and Ground-Water Recharge to the Edwards and Associated Limestones, 1960-62, San Antonio Area, Texas |
Description:
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Annual report for 1960-62 on precipitation, aquifer levels, and recharge to the Edwards Aquifer issued by the Edwards Underground Water District
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| Title: |
Evaluation of the Option to Designate a Separate San Marcos Pool for Critical Period Management |
Description:
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Hydrogeologic relationships between nearby streams and rivers to springflow at San Marcos Springs
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| Title: |
Evaluation of the Aquifer and Springflow Impacts Associated with the Cibolo Creek Transfer Rules |
Description:
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Use of data and modeling to determine effects on springflow in Comal and San Marcos Springs from Cibolo Transfers (transfers of permits from Bexar to eastern counties)
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| Title: |
Tracing Groundwater Flowpaths in the Edwards Aquifer Recharge Zone, Panther Springs Creek Basin, Northern Bexar County, TX |
Description:
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Dye tracer tests in the Edwards Aquifer, Balcones Fault Zone, San Antonio Segment, Bexar County, Panther Springs Creek
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| Title: |
Measuring Floodplain Hydraulics of the Frio River Where it Overlies the Edwards Aquifer |
Description:
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Structural and hydrogeological survey of the Frio River to determine if water table underflow contributes to the water budget of the Edwards Aquifer Recharge Zone
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| Title: |
Tracing Groundwater Flowpaths in the Vicinity of San Marcos Springs, Texas |
Description:
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Tracer studies of the San Marcos Springs springshed from 2002 -2010
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| Title: |
Analysis of Recharge and Recirculation Edwards Aquifer Phase 1 |
Description:
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Testing the MODFLOW model with historical data of recharge and recirculation at two hypothetical recharge sites prior to release of the model
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| Title: |
Analysis of Recharge and Recirculation Edwards Aquifer Phase 2 |
Description:
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Use of the MODFLOW model to examine recharge at eight sites in the Edwards Aquifer and discharge at San Marcos Springs
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| Title: |
Recharge and Recirculation / Edwards Aquifer Optimization Program Phase III / IV Report Final |
Description:
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Continued and final analyses using improved flow model and recent agency rules for optimizing recharge and streamflow in the Edwards Aquifer
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| Title: |
Geophysical Survey to Determine the Depth and Lateral Extent of the Leona Aquifer and Evaluation of Discharge Through the Leona River Floodplain, South of Uvalde, Texas |
Description:
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Determination of groundwater flow regime for the Leona Formation aquifer in the Leona River floodplain
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| Title: |
The Edwards Aquifer Extremely Productive, but… |
Description:
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Semi-technical description of the Edwards aquifer and considerations for its use and preservation for the general public and policy-makers
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| Title: |
Edwards/Glen Rose Hydrologic Communication, San Antonio Region, Texas |
Description:
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Hydrogeological and modeling study of transmissivity between the Glen Rose and Edwards aquifers in the Cibolo Creek Basin and Guadalupe River
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| Title: |
Medina Lake Hydrology Study |
Description:
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Hydrologic and hydraulic analyses for the Medina Lake and Medina Diversion Lake reservoir system
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| Title: |
A Statistical Study of the Hydrological Character of the Edwards Aquifer |
Description:
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Statistical analysis of surface and groundwater levels from October 1998 storm event
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| Title: |
Edwards Aquifer Parameter Estimation Project: Final Report |
Description:
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Revision 3 of the hydraulic conductivity model using spatial statistics and various hydrological data calibrated to steady-state hydraulic head measurements and partially calibrated to steady-state spring discharges, for manual calibration of the model and as a basis for fully automated calibrations. This study is included for historical value and may have been supplanted by more recent ones.
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| Title: |
Conceptualization and Simulation of the Edwards Aquifer, San Antonio Region, Texas |
Description:
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A new ground-flow model for the San Antonio and Barton Springs segments in the San Antonio region. Note: this document is included for its historical value and may have been replace by more recent updates.
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| Title: |
Valdina Farms Sinkhole: Hydrogeologic & Biologic Evaluation |
Description:
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Documentation of hydrogeology, structure and fauna in Valdina Farms Sinkhole, Medina County, in 1987
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| Title: |
Statistical Analysis of Water-Level, Springflow and Streamflow Data for the Edwards Aquifer in South-Central Texas |
Description:
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Development of data-based simple and multiple linear regression equations for estimating water levels, springflow and streamflow in the San Antonio region of the Edwards Aquifer
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| Title: |
Hydrogeology, Hydrologic Budget and Water Chemistry of the Medina Lake Area, Texas |
Description:
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Assessment of the geology, hydrogeology and hydrology of Medina and Diversion Lakes and seepage into the Edwards / Trinity aquifers
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| Title: |
Effects of Brush Management on the Hydrologic Budget and Water Quality In and Adjacent to Honey Creek State Natural Area, Comal County, Texas, 2001-10 |
Description:
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Effects of brush management on hydrologic budget and water quality. May not be generalizable to all locations. See Fact Sheet companion document of the same name.
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| Title: |
Measuring Floodplain Hydraulics of Seco Creek and Medina River Where They Overlie the Edwards Aquifer – Final Report |
Description:
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Study of the hydraulic relationships between Seco Creek, the Medina River, and the Edwards Aquifer
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| Title: |
A Lumped Parameter Model for the Edwards Aquifer |
Description:
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Computer modeling of the San Antonio region of the Edwards Aquifer using a nonlinear optimization algorithm with a Kalman filter
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| Title: |
Water-Budget Analysis of Medina and Diversion Lakes and the Medina/Diversion Lake System, with Estimated Recharge to Edwards Aquifer, San Antonio, Texas |
Description:
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Water-budget analysis for Medina and related lakes including recharge in the Edwards Aquifer from 1995-2002
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| Title: |
1987 Hydrologic Data Report – Compilation of Hydrologic Data for the Edwards Aquifer, San Antonio Area, Texas, 1987, with 1934-87 Summary – Plates |
Description:
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Plates from annual report for 1987 on recharge, discharge, water levels and water quality in the Edwards Aquifer San Antonio Region. Note: Requires large-format printer.
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| Title: |
Water resources of the Edwards Aquifer Region [Infographic] |
Description:
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Infographic and map showing structure, discharge and recharge of the Edwards Aquifer. Scale ca. 1:500,000. Note: contains both letter-size and large-format versions.
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| Title: |
Effects of Brush Management on the Hydrologic Budget and Water Quality In and Adjacent to Honey Creek State Natural Area, Comal County, Texas, 2001-10 [Fact Sheet] |
Description:
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Fact Sheet companion document to full report of the same name.
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| Title: |
The Edwards Underground Reservoir [Trifold Brochure and Map] |
Description:
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Map and summary of the Edwards Aquifer and Edwards Underground Water District. Note: this information is no longer current but is included for historical value.
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| Title: |
The Edwards Underground Reservoir and the Edwards Underground Water District |
Description:
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General description of the Edwards Aquifer and current concerns and acts of regulatory agencies in 1975. This document is included for its historical value and information may no longer be current. |
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| Title: |
Water Quality Trends Analysis of the San Antonio Segment, Balcones Fault Zone Edwards Aquifer, Texas |
Description:
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Collection and analysis of thousands of groundwater, surface water, and spring water samples to evaluate water quality in the San Antonio segment of the Balcones Fault Zone Edwards Aquifer of south central Texas.
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| Title: |
Appendix C of Edwards Aquifer Authority Hydrologic Data Report for 2013 |
Description:
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Appendix C of annual report for 2013 on recharge, discharge, water levels and water quality in the Edwards Aquifer San Antonio Region
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| Title: |
DEVELOPMENT OF A FINITE-ELEMENT METHOD GROUNDWATER FLOW MODEL FOR THE EDWARDS AQUIFER |
Description:
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Attributes of the alternative model that set it conceptually independent from the 2004 MODFLOW model are: Inclusion of the Contributing Zone Recharge is calculated directly from precipitation and is not prescribed at the upgradient side of the Recharge Zone Western boundary is refined to better define the Kinney Pool The Contributing and Recharge Zones are characterized by three layers Distinct conduits are included in the Confined Zone The alternative model employs a finite-element formulation instead of the finite-difference formulation used in the 2004 MODFLOW model
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| Title: |
Tracing Groundwater Flowpaths in Kinney County, Texas |
Description:
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This report presents the findings of a groundwater flowpath investigation in Kinney County, Texas, performed by the Edwards Aquifer Authority between 2007 and 2012.
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| Title: |
Augmenting Groundwater Recharge Through Brush Control: A Feasibility Study—Phase II |
Description:
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This report summarizes the findings of a 5-year (November 2004–December 2009) investigation of the water dynamics at two sites overlying shallow caves within the Camp Bullis facility in northern Bexar County, Texas. The results of the first phase of this study (November 2004–November 2007) were documented in the Phase I report (Wilcox 2008). In this Phase II report, we summarize the results from the entire study period, focusing on rainfall, cave recharge, and the rainfall simulation experiments conducted during Phase II.
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| Title: |
Re-Conceptualizing the Edwards Aquifer Authority Recharge Program: Staff Recommendations to Optimize and Protect the Edwards Aquifer |
Description:
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Recharge is defined in the EAA Act as: Increasing the supply of water to the aquifer by naturally occurring channels or artificial means. Based on this definition, the EAA recharge program previously consisted of four recharge dams initially sponsored by the EUWD and Medina County Commissioners Court until calendar year 2004, when participation in the regional Precipitation Enhancement Program (PEP) was added to the program.
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| Title: |
EAA 2016 Water Quality Summary |
Description:
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Water Quality Summary from 2016 Hydrologic Data Report on recharge, discharge, water levels and water quality in the Edwards Aquifer San Antonio Region
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| Title: |
EAA Hydrologic Data Report 2016 Recharge |
Description:
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Hydrologic Data Report 2016 Recharge from 2016 Hydrologic Data Report on recharge, discharge, water levels and water quality in the Edwards Aquifer San Antonio Region
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| Title: |
EAA Hydrologic Data Report 2016 Discharge |
Description:
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Hydrologic Data Report 2016 Discharge from 2016 Hydrologic Data Report on recharge, discharge, water levels and water quality in the Edwards Aquifer San Antonio Region
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| Title: |
EAA 2016 Precipitation in the Edwards Aquifer Region |
Description:
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Precipitation in the Edwards Aquifer Region from 2016 Hydrologic Data Report on recharge, discharge, water levels and water quality in the Edwards Aquifer San Antonio Region
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