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Water Quality in the San Marcos Basin

Water Quality in the San Marcos Basin. GIS in Water Resources Aurore Mercelat. Agenda. Objectives and location Problematic Groundwater quality Surface water quality Conclusions Future work. Objectives. Compare water quality : Groundwater vs Surface water

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Water Quality in the San Marcos Basin

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  1. Water Quality in the San Marcos Basin GIS in Water Resources Aurore Mercelat

  2. Agenda • Objectives and location • Problematic • Groundwaterquality • Surface water quality • Conclusions • Future work Final Project Presentation

  3. Objectives Compare water quality: • Groundwater vs Surface water • Drinking water vs recreational water Final Project Presentation Source: http://blog.texasrvtravel.com/ https://www.acsmeetings.org/

  4. Wheredoesourstudytake place? • Why? • Edwards aquifer: groundwater • Rivers: surface water • San Marcos city: on the aquifer and nearseveralrivers Final Project Presentation

  5. Problematics Final Project Presentation Source: City Of San Marcos Water Supply Master Plan, December 2004

  6. Water supplies of San Marcos • Current water supplies: • Mainly Edwards aquifer: BUT, new regulations to protect the aquifer • Potentiel water supplies: • Reclaimed water (wastewaterreuse) • Surface water • Canyon Lake: costsleasing and carrying the water (≈ 30 km) • San Marcos river (rightsalreadyowned) (some km) • Othergroundwaterresources Final Project Presentation • Whatwouldbe the difference of qualitybetweengroundwater and surface water?

  7. Groundwaterresource: the Edwards Aquifer • "Water quality in the Edwards isexceptionally good" (http://www.edwardsaquifer.net/) • Metals: usuallybelowdrinking water standards • Ions: healthy mix • Fecal coliformbacteria: indicators of harmfulbacteriapresence Final Project Presentation Source: http://www.ars.usda.gov

  8. Surface water around San Marcos Final Project Presentation

  9. Bacteriologicalquality • EPA measurements • TCEQ measurements • NWIS measurements 2000 2000 Final Project Presentation 126 126 2000

  10. Conclusions • Surface water isprone to variations • canexceeddrinking water requirements • canexceedrecreational water requirements • Generally, less clean than Edwards' water • Whyisitso? • What are the potentialsources of pollution? Final Project Presentation

  11. Edwards ' Water, Naturallyhealthy? • Natural treatments: • Dilution • Settling • Biologicalactivity: neutralizeorganicmaterial • Natural Degradation Final Project Presentation

  12. Future work • Identify the potential sources of pollution Final Project Presentation

  13. Thankyou for listening... Final Project Presentation

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