TAAP Publications

TAAP-Official Binational Report

The International Boundary and Water Commission, United States and Mexico (IBWC) have completed the Binational Study of the Transboundary San Pedro Aquifer.

Read the report

February 05, 2025

Prioritizing Transboundary Aquifers in the Arizona–Sonora Region: A Multicriteria Approach for Groundwater Assessment

Groundwater is vital to the well-being of over 20 million people in the nearly 2000-mile-long, arid U.S.–Mexico border region, supporting agricultural,…

map of upper and lower colorado river basin

December 02, 2024

Prepublication Excerpt: Factors that Contribute to Successful Diplomatic Outcomes: Case Study of the Colorado River Basin Cross-boundary Institution

This case study provides insights regarding factors that contribute to successful cross-boundary diplomatic outcomes in the Colorado River Basin. The…

September 20, 2024

WRRC Weekly Wave: TAAP Workshop in Hermosillo: Participatory, Positive, and Productive

Last week, WRRC Director Sharon B. Megdal and Associate Director Jamie McEvoy traveled to Hermosillo, the capital of the Mexican state of Sonora, to…

June 07, 2024

Reflections: On Participating in the 10th World Water Forum

Water for shared prosperity was the theme of the 10th World Water Forum, which was held May 18–25 in Bali, Indonesia. My work has taken me to Europe and the…

March 22, 2024

Update on the Transboundary Aquifer Assessment Program

Update on the Transboundary Aquifer Assessment Program, with a focus on the Arizona-Sonora Components

Subcommittee on Water, Wildlife and Fisheries legislative hearing, Oct. 25, 2023

October 27, 2023

Reflections: Testifying on Reauthorization of the Transboundary Aquifer Assessment Program

On October 25, 2023, I had the honor of presenting testimony on H.R. 5874 at the U.S. House of Representatives Committee on Natural Resources, Subcommittee on…

June 23, 2023

Summer Wave: In-Person TAAP Meeting Held in Arizona

On June 6, 2023, US team members from the Transboundary Aquifer Assessment Program (TAAP) met at the WRRC to talk about past, current, and future research and…

March 31, 2023

Weekly Wave: New Article on Transboundary Groundwater from WRRC Director

WRRC Director Sharon B. Megdal's opinion paper, “Increasing the visibility of transboundary groundwater,” was published on March 21 in PLOS Water. In her…

March 21, 2023

Increasing the visibility of transboundary groundwater

Released on World Water Day 2022, the 2022 United Nations World Water Development Report, Groundwater: Making the invisible visible [1], highlights…

March 02, 2023

Advances in Transboundary Aquifer Assessment

Groundwater serves the drinking water needs of about 50% of the global population and contributes to over 40% of the global production of irrigated crops. Over…

February 14, 2023

Project Title: Transboundary Aquifer Assessment Program (TAAP): Arizona Water Resources Research Center Effort

In 2017, the University of Arizona Water Resources Research Center started working on a Five-Year Transboundary Aquifer Assessment Program (TAAP) effort funded…

November 07, 2022

Transboundary Aquifers: Challenges and the way forward

Groundwater is vital to the sustainability and survival of human communities in the U.S.-Mexico border region, a nearly 2000 mile-long, arid zone in North…

March 01, 2022

Hydrogeomorphologic Mapping of the Transboundary San Pedro Aquifer: A Tool for Groundwater Characterization

Abstract Hydrogeomorphology is an emerging discipline that studies the relationship between landforms and hydrology, focusing on groundwater and surface…

February 04, 2022

WATER MANAGEMENT ON THE U.S.-MEXICO BORDER: ACHIEVING WATER SUSTAINABILITY AND RESILIENCE THROUGH CROSS-BORDER COOPERATION

Contributing Authors: Christopher Brown (New Mexico State University), Paul Ganster (San Diego State University), Hilda García (El Colegio de la Frontera…

January 12, 2022

Assessing Groundwater Withdrawal Sustainability in the Mexican Portion of the Transboundary Santa Cruz River Aquifer

The impact of climate uncertainties is already evident in the border communities of the United States and Mexico. This semi-arid to arid border region has…