Environmental Earth Sciences

, Volume 74, Issue 12, pp 7633–7642 | Cite as

Surface water–groundwater interactions along the Blanco River of central Texas, USA

  • B. A. Smith
  • B. B. Hunt
  • A. G. Andrews
  • J. A. Watson
  • M. O. Gary
  • D. A. Wierman
  • A. S. Broun
Thematic Issue


The Blanco River is a very important resource for water supplies in the Hill Country of central Texas. Some communities and properties along the river use the surface water directly. But, the Blanco River is more significant in the role it plays in providing recharge to the karstic Trinity and Edwards Aquifers. Recent studies have given a better indication of the complexity of the interactions between surface water and groundwater in the area. Besides being a water supply to a population of several hundred thousand people, water originally flowing in the Blanco River provides flow to springs that host a number of endangered species. The Blanco River is characterized by alternating gaining and losing stretches due to the presence of springs that discharge water into the river and swallets that drain water from the river. Trinity units outcrop in the western part of the study area, and Edwards units outcrop in the eastern part of the study area. Normal faulting along the Balcones Fault Zone has juxtaposed the older, stratigraphically underlying Trinity units against the Edwards units to the east. The region consists primarily of Lower Cretaceous limestone, dolomite, and marl. One of the more significant springs along the Blanco River is Pleasant Valley Spring. During below-average flow conditions, Pleasant Valley Spring becomes the headwaters of the Blanco River even though the headwaters, under wet conditions, are about 50 km upstream. These studies, summarized in this paper, provide a greater understanding of the surface water and groundwater resources in the area which will help guide policies for groundwater management and preservation of springflows and groundwater supplies.


Karst Edwards Aquifer Trinity Aquifer Texas 


  1. Ashworth JB (1983) Ground-water availability of the Lower Cretaceous formations in the Hill Country of south-central Texas. Texas Department of Water Resources Report 273, p 173Google Scholar
  2. BSEACD (2014) Regional habitat conservation plan for groundwater use and management of the Barton Springs segment of the Edwards Aquifer. Barton Springs/Edwards Aquifer Conservation District, prepared for US Fish and Wildlife Service, Austin, TX, February 2014, p 191, plus appendicesGoogle Scholar
  3. Collins EW (2004) Summary of the Balcones fault zone, central Texas: a prominent zone of tertiary normal faults marking the western margin of the Texas Coastal Plain. In: Hoh A, Hunt B (eds) Tectonic history of Southern Laurentia: a look at mesoproterozoic, late-paleozoic, and cenozoic structures in Central Texas. Austin Geological Society Guidebook 24, November 2004, pp 81–89Google Scholar
  4. Collins EW, Hovorka SD (1997) Structure map of the San Antonio segment of the Edwards Aquifer and Balcones Fault Zone, south-central Texas: structural framework of a major limestone aquifer: Kinney, Uvalde, Medina, Bexar, Comal and Hays Counties. The University of Texas at Austin, Bureau of Economic Geology, Miscellaneous Map No. 38, scale 1:250,000, text, p 14Google Scholar
  5. Ewing TE (1991) Structural framework. In: Salvador A (ed) The Gulf of Mexico basin. Geological Society of America, The Geology of North America, vol J, pp 31–52Google Scholar
  6. Ferrill DA, Sims DW, Morris AP, Waiting DJ (2003) Structural controls on the Edwards Aquifer/Trinity Aquifer interface in the Camp Bullis Quadrangle, Texas. Edwards Aquifer Authority ReportGoogle Scholar
  7. Ferrill DA, Sims DW, Wating DJ, Morris AP, Franklin NM, Schultz AL (2005) Structural framework of the Edwards Aquifer recharge zone in south-central Texas. Geol Soc Am Bull 116:407–418CrossRefGoogle Scholar
  8. Grimshaw TW, Woodruff CM (1986) Structural style in an en echelon fault system, Balcones Fault Zone, Central Texas. Geomorphologic and Hydrologic Implications. In: Abbott PL, Woodruff CM (eds) The Balcones escarpment. Geological Society of America, Central Texas, pp 71–76Google Scholar
  9. Hauwert NM, Sharp JM (2014) Measuring autogenic recharge over a karst aquifer utilizing eddy covariance evapotranspiration. J Water Resour Protect 6:869–879. doi: 10.4236/jwarp.2014.69081 CrossRefGoogle Scholar
  10. Hill RT (1898) Geology of the Edwards Plateau and the Rio Grande Plain adjacent to Austin and San Antonio, Texas, with reference to the occurrence of underground water. US Geological Survey Annual report vol 18, pt 2Google Scholar
  11. Hunt BB, Smith BA (2010) Spring 2009 Potentiometric map of the Middle Trinity Aquifer in Groundwater Management Area 9, Central Texas. BSEACD Report of Investigations 2010-0501, p 26Google Scholar
  12. Hunt BB, Smith BA, Slade R, Gary RH, Holland WF (2012) Temporal trends in precipitation and hydrologic responses affecting the Barton Springs segment of the Edwards Aquifer, central Texas. Gulf Coast Association of Geological Societies Transactions, 62nd Annual Convention, Oct 21–24, 2012, Austin, TXGoogle Scholar
  13. Hunt BB, Norris C, Gary MO, Wierman DA, Broun AS, Smith BA (2013) Pleasant Valley Spring: a newly documented karst spring of the Texas Hill Country Trinity Aquifer. Geological Society of America, South-Central Section-47th Annual MeetingGoogle Scholar
  14. Johnson S, Schindel G, Veni G, Hauwert N, Hunt B, Smith B, Gary M (2012) Tracing groundwater flowpaths in the vicinity of San Marcos Springs, Texas. Edwards Aquifer Authority, San Antonio, TX, Report No. 12-03, p 139Google Scholar
  15. Jones I, Anaya R, Wade S (2009) Groundwater availability model for the Hill Country portion of the Trinity Aquifer system, Texas. Unpublished Texas Water Development Board Report, p 191Google Scholar
  16. Mace RE, Chowdhury AH, Anaya R, Way SC (2000) Groundwater availability of the Trinity Aquifer, Hill Country Area, Texas—Numerical simulations through 2050. Texas Water Development Board Report 353, p 119Google Scholar
  17. Maclay RW (1995) Geology and hydrology of the Edwards Aquifer in the San Antonio Area, Texas, United States Geological Survey, Water-Resources Investigations Report 95-4186Google Scholar
  18. Ockerman DJ (2007) Simulation of streamflow and estimation of ground-water recharge in the upper Cibolo Creek watershed, south-central Texas, 1992–2004: US Geological Survey Scientific Investigations Report 2007–5202, p 34Google Scholar
  19. Palmer EC (1986) Land use and cultural change along the Balcones Escarpment: 1718–1986. In: Abbott PL, Woodruff CM Jr (eds) The Balcones escarpment. Geological Society of America, Central Texas, pp 153–162Google Scholar
  20. Sellards EH, Baker CL (1934) The geology of Texas, vol II, structural and economic geology. University of Texas, Austin, Bulletin No. 3401, p 884Google Scholar
  21. Sharp JM (1990) Stratigraphic, geomorphic and structural controls of the Edwards Aquifer, Texas, USA. In: Simpson ES, Sharp JM Jr (eds) Selected Papers on Hydrogeology: Heise, Hannover, Germany, International Association of Hydrogeologists, vol 1, pp 67–82Google Scholar
  22. Slade R (2014) Documentation of a recharge-discharge water budget and main streambed recharge volumes, and fundamental evaluation of groundwater tracer studies for the Barton Springs segment of the Edwards Aquifer. Texas Water J Texas Water Resour Inst 5(1):12–23Google Scholar
  23. Slade RM, Bentley JT, Michaud D (2002) Results of streamflow gain-loss studies in Texas, with emphasis on gains from and losses to major and minor aquifers. US Geological Survey Open-File Report 02-068, p 131. +2 over-size sheetsGoogle Scholar
  24. Smith BA, Hunt BB (2010) Hydraulic interaction between the Edwards and Trinity Aquifers. In: Wierman D, Broun A, Hunt B (eds) Hydrogeologic atlas of the Hill Country Trinity Aquifer, July 2010, 17 platesGoogle Scholar
  25. Smith BA, Hunt BB, Beery J (2011) Final report for the Onion Creek recharge project, northern Hays County, Texas. Barton Springs/Edwards Aquifer Conservation District, Austin, TX, prepared for the Texas Commission on Environmental Quality, August 2011, p 47 plus appendicesGoogle Scholar
  26. Smith BA, Hunt BB, Johnson SB (2012) Revisiting the hydrologic divide between the San Antonio and Barton Springs segments of the Edwards Aquifer: insights from recent studies. Gulf Coast Association of Geological Societies Journal, vol 1, 62nd Annual Convention, October 21–24, 2012, Austin, TX, pp 55–68Google Scholar
  27. Smith BA, Hunt BB, Andrews AG, Watson JA, Gary MO, Wierman DA, Broun AS (2014) Hydrogeologic influences of the Blanco River on the Trinity and Edwards Aquifers, Central Texas, USA. In: Andreo B, Carrasco F, Duran JJ, Jimenez P, Lamoreaux JW (eds) Hydrogeological and Environmental Investigations in Karst Systems, Springer Environmental Earth Sciences, pp 153–161Google Scholar
  28. USGS (2014) Unpublished data, US Geological Survey.
  29. Watson JA, Hunt BB, Gary MO, Wierman DA, Smith BA (2014) Potentiometric surface investigation of the Middle Trinity Aquifer in Western Hays County, Texas. Barton Springs/Edwards Aquifer Conservation District Report of Investigations, 2014-1002, p 21Google Scholar
  30. Wierman DA, Hunt BB (2010) Surface water and groundwater interaction. In: Wierman D, Broun A, Hunt B (eds) Hydrogeologic atlas of the Hill Country Trinity Aquifer, July 2010, 17 platesGoogle Scholar
  31. Wierman DA, Broun AS, Backus AH, Llano L (2008) Cypress Creek/Jacob’s Well Hydrogeologic Report. Hays Trinity Groundwater Conservation District, December 2008, p 43Google Scholar
  32. Wierman DA, Hunt BB, Broun AS, Smith BA (2010) Recharge and groundwater flow. In: Wierman D, Broun A, Hunt B (eds) Hydrogeologic atlas of the Hill Country Trinity Aquifer, July 2010, 17 platesGoogle Scholar
  33. Wong CI, Kromann JS, Hunt BB, Smith BA, Banner JL (2014) Investigating groundwater flow between Edwards and Trinity Aquifers in central Texas. Ground Water J 52(4):624–639. National Ground Water AssociationGoogle Scholar
  34. Woodruff CM, Abbott PL (1986) Preface. In: Abbott PL, Woodruff CM (eds) The Balcones escarpment. Geological Society of America, Central TexasGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • B. A. Smith
    • 1
  • B. B. Hunt
    • 1
  • A. G. Andrews
    • 1
  • J. A. Watson
    • 1
  • M. O. Gary
    • 2
  • D. A. Wierman
    • 3
  • A. S. Broun
    • 3
  1. 1.Barton Springs/Edwards Aquifer Conservation DistrictAustinUSA
  2. 2.Edwards Aquifer AuthoritySan AntonioUSA
  3. 3.Independent ConsultantDripping SpringsUSA

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