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Chemical Hydrogeology of the Hill Country, Texas

Chemical Hydrogeology of the Hill Country, Texas. Megan Andring 11/20/2008. Study Area. Problem Definition. Zone of high SO 4 in well water Why is SO 4 distributed linearly? How can GIS be used to analyze this problem?. Travis. Gillespie. Blanco. Hays. Kerr. Kendall. Comal.

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Chemical Hydrogeology of the Hill Country, Texas

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  1. Chemical Hydrogeology of the Hill Country, Texas Megan Andring 11/20/2008

  2. Study Area

  3. Problem Definition • Zone of high SO4 in well water • Why is SO4 distributed linearly? • How can GIS be used to analyze this problem? Travis Gillespie Blanco Hays Kerr Kendall Comal Bandera Bexar Medina

  4. Data & Approach • Use TX well data • Analyze trends in chemistry • Look for spatial trends

  5. Central Texas Geology • Mostly Cretaceous limestone and evaporites • Gypsum: CaSO4 • Calcite: CaCO3 • Halite: NaCl

  6. Methods: Well Chemistry Data

  7. Methods: Well Chemistry Data

  8. Methods: Well Data • Join chemical data for wells to spatial data

  9. Results: Trends in Chemistry

  10. Results: Trends in Chemistry

  11. Results: Trends in Chemistry • Separate wells by geologic unit

  12. Results: Interpolation

  13. Results: Spatial Trends • Compare SO4 distribution with elevation

  14. Results: Spatial Trends • Compare SO4 distribution with elevation

  15. Results: Spatial Trends • Compare SO4 distribution with elevation

  16. Summary of Findings • SO4concentrated in Glen Rose & related formations • Highest SO4concentrations found on interfluves

  17. Future Work • Compare locations of known gypsum layers in Glen Rose Fmn. with well data • Delineate watersheds using ArcHydro & compare with SO4 distribution

  18. Data Sources & Acknowledgements • Texas Water Development Board • Texas Commission on Environmental Quality • Texas Natural Resources Information System • Ron Fieseler, Groundwater District Manager, Blanco County • Dr. Phil Bennett, Jackson School of Geosciences

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