Photo of Holly Barnard

Holly Barnard

We are focused on investigating how vegetation processes affect water flow dynamics and pathways in soil and streams, and conversely, how water flow paths affect vegetation function in mountainous terrain.

Learn about the Ecohydrology Lab     See INSTAAR news about Barnard



Holly Barnard recieves awards from Boulder Faculty Assembly and the Diversity Committe of the College of Arts and Sciences 

Dr. Barnard won an Excellence Award from the Boulder Faculty Assembly, recognizing her outstanding work and effort to make advances in the academy.  More specifically, she was one of just three recipients across campus to win the Excellence in Leadership & Service award (2020-2021).  Separately, she was also recognized by the Diversity Committee of the Arts and Sciences Council for her efforts to increase diversity and inclusion. Students, staff and faculty received the first such awards from ASCEND, the Arts and Sciences Consortium of Committees on Climate, Equity, Inclusion and Diversity.  

February 2021: New publications

Andrew Birch is rocking the hydrology journals with two new publications that go together like chocolate and peanut butter:

"Precipitation Characteristics and Land Cover Control Wet Season Runoff Source and Rainfall Partitioning in Three Humid Tropical Catchments in Central Panama" is published in Water Resources Research (Birch and Barnard co-authors)

"The influence of land cover and storm magnitude on hydrologic flowpath activation and runoff generation in steep tropical catchments of central Panama" is accepted in Journal of Hydrology (Birch, Bush, and Barnard co-authors).


Congratulations Dr. Andrew Birch!

Andrew begins his new career with the National Park Service as one of the water quality leads! Amazing job for an amazing guy.

national park service info card for water resources division

November 2020: New publication

Isaac Bukoski's manuscript entitled "Summer Runoff Generation in Foothill Catchments of the Colorado Front Range" is accepted in Journal of Hydrology (Bukoski and Barnard co-authors). This is Isaac's first first-authored paper.  Congratulations Isaac!

September 2020: New publications

Sidney Bush's manuscript entitled "Assessing plot-scale impacts of land-use on overland flow generation in central Panama" is accepted in Hydrological Processes (Bush and Barnard co-authors). This is Sidney's first first-authored paper.  Congratulations Sidney!

Lindsay Hale's manuscript entitled "Increasing plant water stress and decreasing summer streamflow in response to a warmer and wetter climate in seasonally snow covered forests" is accepted for publication in Ecohydrology (Barnard and Adams co-authors).

Holly Barnard leads new NSF-funded Critical Zone Cluster

The project focuses on the role of subsurface water storage in driving Earth surface processes. Read the CU Boulder Today story about the new cluster.

The lab welcomes Ethan Burns

Ethan joined the lab as a new MA student in Geography.

Congratulations to Dr. Andrew Birch!

Andrew successsfully defended his PhD on May 8th, 2020 via Zoom. 

Science slide about hydrology in the humid tropics

May 2020: New publications

Kurt Solander's manuscript entitled "The pantropical response of soil moisture to El Nino" is accepted and and available in Hydrology and Earth System Sciences (HESS) (Barnard co-author).

Ryan Harmon's manuscript entitled "Water Table Depth and Bedrock Permeability Control Magnitude and Timing of Transpiration‐Induced Diel Fluctuations in Groundwater" is accepted and available in Water Resources Research (Barnard co-author).

April 2020: New publication

Ashley Coble's manuscript entitled "Long-term hydrological response to forest harvest during seasonal low flow: Potential implications for current forest practices" is accepted and available in Science of the Total Environment (Barnard co-author).

Best Acting by an Adult award from Earth Explorers

Holly and Hallie win Best Acting by an Adult award from Earth Explorers for the middle school student film "Treeless"

Congratulations to Isaac Bukoski

Isaac begins his new Geochemist position with Knight Piésold consulting in Denver.


Congratulations to Hallie Adams and welcome back!!

Hallie Adams was awarded a NSF Graduate Research Fellowship and has returned to the lab to pursue a PhD after earning her Masters in 2014. Read Hallie's story in CU Boulder Today.

Holly returns from her term as NSF Program Officer

Holly Barnard in front of the NSF building on her last day of work there

Holly was the Program Officer for the Hydrologic Sciences Program at the National Science Foundation. Read about her experience  in the AGU Hydrology Section Newsletter - see page 11 in the PDF.

June 2019: New Publication:

Emily Voytek's manuscript entitled "Transpiration‐and precipitation‐induced subsurface water flow observed using the self‐potential method" is accpeted and available in Hydrological Processes.

Congratulations Isaac Bukoski

Isaac successfully defended his MA thesis titled: Hydrologic flowpaths in foothill catchments of the Colorado Front Range on May 17, 2019


December 2018: New Publication:

David Barnard's manuscript "Reevaluating growing season length controls on net ecosystem production in evergreen conifer forests" is accepted and available in Nature's Scientific Reports (Barnard co-author).


May 2017: New Publication:

Three science x-y non-linear plots David Barnard's manuscript "Topoclimate effects on growing season length and montane conifer growth in complex terrain" is accepted and available in Environmental Research Letters (Barnard co-author).

March 2017: New Publication:

Rainbow colored science plotTyson Swetnam's manuscript, "Topographically-driven differences in energy and water constrain climatic control on forest carbon sequestration," is accepted in Ecosphere (Barnard co-author).

February 2017: Stephanie Jarvis goes to Isocamp

3D models of moleculesShe has been accepted to the University of Utah Isocamp.

January 2017: Collaborator, Dr. Kamini Singha (Colorado School of Mines), is the 2017 NGWA Darcy Lecturer! 

Photo of Kamini SinghaKamini will be highlighting some of our transpiration-groundwater interaction results at select locations.


November 2016: The Ecohydrology Lab congratulates Daphne Szutu

Congrats on her new position at the UC Berkeley Biometeorology Lab! We miss you.

September 2016, New Publication:

Grid of 4 science data plotsScott Allen's manuscript, "The role of stable isotopes in understanding rainfall interception processes: a review," has been accepted for publication in WIREs Water (Barnard co-author).

June 2016, New Publication:

Four x-y plots with fitted linear relationshipsMaggie Burns' manuscript, "Dissolved organic matter transport reflects hillslope to stream connectivity during snowmelt in a montane catchment," has been accepted for publication in Water Resources Research (Barnard and Burns co-author).

March 31 - April 1, 2016: Holly Barnard and Daphne Szutu presented talks at the 11th Annual CU Hydrologic Sciences Symposium.

Holly presented on "Examining diel patterns of soil and xylem moisture using electrical resistivity imaging," and Daphne presented on "Linking sap flow and stable isotope techniques to understand transpiration dynamics in a semiarid shrubland."

March, 2016: Sidney Bush received an Honorable Mention

She applied to the NSF Graduate Research Fellowship Program. Congratulations, Sidney!

The Ecohydrology Lab welcomes Andrew Birch!

Photo of Andrew Birch
Andrew Birch will be joining the Geography Department this summer as a Ph.D student. His research will focus on how land use influences water residence time and subsurface flowpaths in a Panama Canal watershed.

February 2016, New Publication:

Complex 3D diagrams as part of science figure Rachel Mares' manuscript, "Examining diel patterns of soil and xylem moisture using electrical resistivity imaging," has been accepted for publication in the Journal of Hydrology (Barnard co-author).


December 15, 2015: Holly Barnard, Brian Ebel, and Wendy Robertson co-Convene AGU session

Holly Barnard, Brian Ebel, and Wendy Robertson co-convened AGU session H034: Ecohydrology of Disturbed Environments session at the American Geophysical Union Fall Meeting.

November 7, 2015: Holly Barnard gave an invited talk at the University of Idaho

Spoke at the Department of Forest, Rangeland, and Fire Sciences and visited with Dr. Tara Hudiburg's lab.

September 24, 2015: Holly Barnard gave an invited talk at University of Vermont

Spoke at the University of Vermont's Rubenstein School of Environment and Natural Resources and visited with Dr. Carol Adair's lab.

September 9 – 11, 2015: Holly Barnard participated in research workshop at Shale Hills CZO

Exploring Four Critical Puzzles about Trees, Water, and Soil:  A Vision for Research workshop held at the Susquehanna Shale Hills Critical Zone Observatory at Penn State University.

June 18, 2015: Holly Barnard elected for Gordon Research Conference chair positions

She was elected 2017 Vice-chair/2019 Chair of the Gordon Research Conference: Catchment Science: Interactions of Hydrology, Biology & Geochemistry.

The Ecohydrology Lab welcomes new research associate and lab manager!

Daphne Szutu has joined the lab and INSTAAR where she will be leading field activities for our project in Oregon and managing the lab.

June 3, 2015: Hallie Adams will give presentation to Boulder data geeks  

She will present her Ecosphere paper to the Analyze Boulder community of 2000+ data practitioners at their monthly meeting.

The Ecohydrology Lab welcomes Sidney Bush!

Photo of Sidney Bush

Sidney Bush will be joining the Geography Department this summer as an M.A. student and her research will focus on hillslope infiltration in Panama.

April 2015, New Publication

John Knowles' manuscript, "The relative contributions of alpine and subalpine ecosystems to the water balance of a mountainous, headwater catchment," has been accepted for publication in Hydrological Processes (Barnard co-author).

March 2015, New Publication

Rachel Gabor's manuscript, "Influence of leaching solution and catchment location on the fluorescence of water-soluble organic matter", has been accepted for publication in Environmental Science and Technology (Barnard and Burns co-authors).

March 2015: Anna Vinton, accepts PhD position at Yale University

Anna was the lab's first undergraduate technician. She heads to Yale to study quantitative avian biology.  Congratulations, Anna!

Feb. 26, 2015: Fort Collins on the Front Lines of Climate Change

Photo of Holly Barnard and advertisement for her invited talk in Fort CollinsHolly Barnard is an invited panelist for this event at Colorado State University. The event will kickoff with a special screening of the newly released short film, “Unacceptable Risk: Firefighters on the Front Lines of Climate Change,” and a panel of local community members and experts to discuss local climate impacts in Fort Collins, followed by a climate action workshop.

Feb. 18, 2015: New Grant Funded by the National Science Foundation, Hydrologic Sciences Program

Holly Barnard and Kamini Singha (Colorado School of Mines) have been awarded a new grant titled:  "Collaborative Research: From Roots to Rock - Linking Evapotranspiration and Groundwater Fluxes in the Critical Zone." This project addresses a critical knowledge gap in how water storage mediates the connection between evapotranspiration and groundwater dynamics, at the HJ Andrews Experimental Forest Long-term Ecological Research site in Oregon. The project goal is to mechanistically identify the interconnections between ET, groundwater fluxes, and discharge and to determine how these connections vary throughout the seasonal baseflow recession.

Feb. 2015, New Publication:

Clare Stielstra's manuscript, "Climatic and Landscape Influences on Soil Moisture are Primary Determinants of Soil Carbon Fluxes in Seasonally Snow-covered Forest Ecosystems", has been accepted for publication in  Biogeochemistry. (Barnard co-author)

Feb. 2015: Maggie Burns (M.A. 2014) accepts new project scientist position

She started with FB Environmental Associates in Maine and New Hampshire.

Jan. 2015: New Publication

Erin BerrymanErin Berryman's (now with the USGS) manuscript: Complex terrain alters temperature and moisture limitations of forest soil respiration across a semi-arid to subalpine gradient, has been accepted for publication in Journal of Geophysical Research - Biogeosciences. (Barnard, Adams, and Burns co-authors)

Dec. 2014: Hallie Adams (M.A. 2014) started as an Environmental Education Specialist

She started with the City of Fort Collins Utilities where she works to engage the community in resource conservation efforts and environmental stewardship through energy and water conservation education. 


Sept. 2014, New Publication

Hallie Adams' manuscript: Topography alters tree growth–climate relationships in a semi-arid forested catchment, has been accepted for publication in Ecosphere. (Barnard and Loomis co-authors).

Aug. 2014: Erin Berryman begins Research Ecologist position

She begins with the USGS Geosciences and Environmental Change Science Center in Lakewood, Colorado.

May 2014: Hallie Adams and Maggie Burns graduate

Both are CU-Boulder Geography graduates.  They will be missed dearly in the lab!

Hallie Adams, Holly Barnard, Maggie Burns