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Fluorescent Tracers for Groundwater Investigation

Learn about the use of fluorescent dyes as a cost-effective tool for studying groundwater flow, geologic controls, and aquifer capacity. Discover the benefits, challenges, and insights provided by tracer tests in groundwater analysis.

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Fluorescent Tracers for Groundwater Investigation

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  1. The use of fluorescent tracers as a groundwater investigation tool Presented by: Geary M. Schindel, P.G.Chief Technical OfficerEdwards Aquifer Authority San Antonio, Texas

  2. Fluorescent Dyes: • Cheap to purchase ($20 - $50 per pound) • Low cost analysis ($15 - $25 per analysis) • Low detectability (10 - 20 ppt) • Non-toxic compounds

  3. Fluorescent Dyes: • Determine Groundwater Flowpaths • Evaluate geologic controls • Time of Travel • Relative Vulnerability of Groundwater Resources • Aquifer assimilative capacity

  4. Fluorescent Dyes: • Can be field labor intensive • Requires identification of recharge and discharge points • Collection and analysis of samples • Requires knowledge and experience with tracer test design

  5. Breakthrough Curves at Landa Lake Outlet Comal Springs Discharge (366 - 352 cfs) Eosine From Panther Canyon Well Uranine from LCRA Well Uranine results indicate photodegradation of dye as it crosses Landa Lake

  6. Geologic Map Dolomitic Basal Nodular Travel time - 3 miles per day Cyclic & Marine

  7. One well-designed tracer test, properly done, and correctly interpreted, is worth a 1000 expert opinions . . . or 100 computer simulations of groundwater flow Dr. James F. Quinlan Tracer tests will change your conceptual understanding of groundwater flow – towards reality Dr. E. Calvin Alexander,

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