Evaristo Critical Zone Hydrology Lab

Quantitative Methods in Hydrology

Advanced analysis of hydrologic processes — precipitation, evapotranspiration, streamflow, groundwater occurrence and movement, and soil zone flow and transport. Emphasis on quantitative methods with field and laboratory data.

Rates and Dates: Hydrological Methods and Applications

Explore how scientists use environmental tracers — like isotopes and chemistry — to unravel the movement of water above and belowground, track pollution, and date water and contaminant sources using cutting-edge tools and data science.

Hillslope Hydrology

Intensive, literature-driven and field-based exploration of hillslope hydrology. Students complete a journal-style critical review and collaborative field project synthesizing course concepts.

Soils and Hydrology

Soil formation and morphology, physical and chemical properties, soil-water interactions, hydrologic processes, and water quality. Co-taught with Matt Levi (Soils).

Fingerprinting Your Water and Stuff!

Hands-on introduction to stable and radioactive isotopes as natural "fingerprints" that trace the origins of water and other materials. First-Year Odyssey Seminar.

Picarro L2140-i Cavity Ring-Down Spectrometer

Our Picarro L2140-i consistently outperforms factory specifications, achieving δ¹⁸O and δD precision approximately three times better than the manufacturer's guaranteed values. The instrument supports high-throughput, high-precision analysis of water isotopes for hydrology, ecology, and water resources applications.

Sample Analysis Pricing

Per-sample rates by isotope analysis, sample type, volume tier, and UGA affiliation.

*Other liquids = liquids with high total dissolved solids (e.g., plant leaves, stems, juices). Note: Analysis of brackish or brine samples may incur higher rates due to greater consumption of consumables (syringes, septa, salt liners). Please contact us for a custom quote on non-standard sample types.

Get in Touch Before Sending Samples

Please contact Dr. Evaristo for detailed information prior to sample collection and before sending your samples to our lab. This ensures we can advise on appropriate sampling protocols, container types, shipment logistics, and turnaround times for your specific project.

Email: evaristo@uga.edu
Address: University of Georgia, Athens, GA 30602, USA

Explore Your Data in Dual-Isotope Space

Upload a results spreadsheet to visualize your samples on a map and in δ²H–δ¹⁸O space against the Global Meteoric Water Line — with descriptive statistics, d-excess, and an optional Local Meteoric Water Line. Everything runs in your browser; no data is uploaded anywhere.

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Every Georgia Gage, 1883 to Present

Explore daily streamflow from more than 600 U.S. Geological Survey gaging stations across Georgia and the Georgia–Florida border strip — including the shared border rivers (St Marys, Suwannee, Apalachicola) whose gages USGS files under Florida — more than 5.4 million daily discharge values spanning 1883 to the present. Search or map-select a station, zoom through its full period of record, and examine seasonal flow regimes, flow duration curves, and annual water-year trends. The dataset refreshes automatically every morning from the USGS National Water Information System, so the record shown is always current. Any station’s records can be downloaded as CSV directly from the explorer — or grab the complete nightly-refreshed archive.

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Every Well, 1900 to Present

Explore groundwater levels from nearly 3,000 U.S. Geological Survey wells across Georgia: 409 continuous recorder wells (2.6 million daily readings back to 1942) plus 2,536 periodic wells measured by field visits (315,000 measurements back to 1900), from the surficial aquifers of the coast to the Upper Floridan and the Piedmont crystalline rocks. Every well is labeled by type — recorder or periodic — with a type filter, and wells with fewer than three usable measurements are left out of the viewer. Search or map-select a well, zoom through its full record, and examine seasonal patterns, level duration curves, annual means, and water-table trends. The dataset refreshes automatically every morning from the USGS National Water Information System. Any station’s records can be downloaded as CSV directly from the explorer — or grab the complete nightly-refreshed archive.

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Every Well, 1900 to Present

Explore groundwater levels from nearly 13,000 U.S. Geological Survey wells across California: 486 continuous recorder wells (10 million daily readings across depth and elevation series) plus 12,369 periodic wells measured by field visits (2.3 million measurements back to 1900), from the Coastal Basin aquifers to the Central Valley and the Basin and Range. Every well is labeled by type — recorder or periodic — with a type filter, and wells with fewer than three usable measurements are left out of the viewer. Many recorder wells report both depth to water and water-surface elevation; switch between series, overlay field measurements, and examine seasonal patterns, level duration curves, annual means, and water-table trends. The dataset refreshes automatically every morning from the USGS National Water Information System. Any station’s records can be downloaded as CSV directly from the explorer — or grab the complete nightly-refreshed archive.

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Sustainable Water Resources Management

Fundamental understanding of catchment functions (partition, storage, release) and hydrological processes in natural and built environments. Students explore sustainable strategies for water resources management using critical thinking, quantitative skills, and management methodologies.

Research in Water Science and Management

Considerations, methods, and research best practices in water science and management. Prepares future water sector professionals to formulate and implement reasonable courses of action for complex water issues. Partly prepares students for their master thesis.

Ecohydrology

Scientific analysis of the processes governing the interaction between biota and the hydrological cycle. Practical application through computer modeling of ecohydrological systems at different scales.

Natural Processes

Earth's energy balance, the hydrological cycle, and the elemental cycles of carbon, nitrogen and phosphorus. Major stocks of energy, water, and elements across the atmosphere, hydrosphere, lithosphere, and biosphere.