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Groundwater Resources in the Llano Uplift Crystalline Massif

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Presentation on theme: "Groundwater Resources in the Llano Uplift Crystalline Massif"— Presentation transcript:

1 Groundwater Resources in the Llano Uplift Crystalline Massif
Llano and Mason Counties, Texas Mishal Al-Johar November 24, 2009 CE 394K GIS in Water Resources

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3 The Llano Uplift is characterized by
GEOLOGY: Igneous and metamorphic crystalline granite, gneiss, and schist CLIMATE: Semi-arid LANDUSE: Rural ranch land SURFACE WATER: Several large, man-made reservoirs Smaller streams GROUNDWATER: Low porosity crystalline rocks Permeable zones occur in fractures Relatively low groundwater storage THE CRYSTALLINE MASSIFF IN THE LLANO UPLIFT IS NOT “OFFICIALLY” A MINOR AQUIFER DOES IT DESERVE TO BE?

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7 Maréchal, J. C., B. Dewandel, and K. Subrahmanyam (2004)

8 Maréchal, J. C., B. Dewandel, and K. Subrahmanyam (2004)

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13 Work completed so far: Work to be done: Geology (outcrops and faults)
Potentiometric surface Some water quality Work to be done: Fracture trends from aerial photos More water quality Better water table map Surface water and precipitation

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