Hydrogeology of the Eastern Edwards Plateau

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1. NO, THIS ISN’T THE EDWARDS PLATEAU, BUT WE CAN DREAM! HYDROGEOLOGY OF THE EASTERN EDWARDS PLATEAU WELDON W. HAMMOND DIRECTOR CENTER FOR WATER RESEARCH UNIVERSITY OF…
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  • 1. NO, THIS ISN’T THE EDWARDS PLATEAU, BUT WE CAN DREAM! HYDROGEOLOGY OF THE EASTERN EDWARDS PLATEAU WELDON W. HAMMOND DIRECTOR CENTER FOR WATER RESEARCH UNIVERSITY OF TEXAS AT SAN ANTONIO AUGUST 29, 2012 Vasey’s Paradise, Grand Canyon
  • 2. WATER MASSES AT THE EARTH’S SURFACE Reservoirs Volume (in millions of cubic Percent of Total kilometers. One cubic kilometer equals 172,052,358 gallons) Oceans 1,370 97.25 Ice Caps and Glaciers 29 2.05 Deep Groundwater (700- 4,000 5.3 0.38 meters) Shallow groundwater 4.2 0.3 (less than 750 meters) Lakes 0.125 0.01 Soil Moisture 0.065 0.005 Atmosphere 0.013 0.001 Rivers 0.0017 0.0001 Biosphere 0.0005 0.00004 Total 1, 407.8 100 Interesting note…..as a comparison we have over 3,200 times more water that occurs as shallow groundwater than in all the rivers and lakes combined. FIGURE 2. WATER MASSES AT THE EARTH’S SURFACE (Source: Encyclopedia Britannica)  
  • 3. Population Growth Example: Kendall County Population Census 2010: 33,410 40.7 Census 2000: 23,743 62.7 Census 1990: 14,589 37.2 Census 1980: 10,635 52.7 Census 1970: 6,964` 18.3 Census 1960: 5,889 8.6 Census 1950: 5,423 6.8 Census 1940: 5,080 - Water resources may well be a limiting factor for future growth potential FIGURE 3. KENDALL COUNTY POPULATION GROWTH % Change from Previous Decade
  • 4. Geology FIGURE 4. SURFACE GEOLOGY (modified from TWDB Report 273)
  • 5. Geologic Formations in the eastern Edwards Plateau that are capable of yielding groundwater (from oldest to youngest) FIGURE 5. STRATIGRAPHY
  • 6. FIGURE 6. GEOLOGIC CROSS SECTION
  • 7. FIGURE 6. GEOLOGIC CROSS SECTION
  • 8. FIGURE 7. AREA STREAMS
  • 9. FIGURE 8. STREAM HYDROGRAPH
  • 10. FIGURE 9. USES OF GROUNDWATER IN TEXAS
  • 11. FIGURE 10. UNDERGROUND WATER
  • 12. FIGURE 11. CONFINED AND UNCONFINED AQUIFERS
  • 13. FIGURE 12. MAJOR AQUIFERS
  • 14. FIGURE 13. MINOR AQUIFERS
  • 15. FIGURE 14. WATER BEARING UNITS
  • 16. Groundwater Flowpaths
  • 17. FIGURE 16. WATER TABLE AND BASE FLOW TO STREAMS
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