Jump to navigation

The University of Arizona Wordmark Line Logo White
Home
  • Facebook
  • Twitter
  • YouTube
  • Events
  • News
  • Publications
  • Programs
  • Resources
  • Opportunities
  • About
  • Give
Weekly Wave
  • Facebook  
  • Twitter  
  • YouTube  

Log In

A research and extension unit of the

College of Agriculture and Life Sciences

Transboundary Aquifer Assessment Program

Arizona/Sonora (TAAP-A/S) 

Para la versión español, haz clic aquí

Project News

The International Boundary and Water Commission, United States and Mexico (IBWC) have completed the Binational Study of the Transboundary San Pedro Aquifer. The study marks the first time researchers from both countries have collaborated to collect data and jointly prepare binational maps of the San Pedro River aquifer, which spans the border between the States of Arizona and Sonora near the communities of Sierra Vista, Arizona and Cananea, Sonora. The binational database and bilingual maps created for this study, and the resulting technical analysis, are an important contribution to scientists’ understanding of the aquifer.

The report is the result of a dedicated group of scientists from both countries that worked with IBWC according to an IBWC-approved binational cooperative framework to allow them to exchange ideas and information to improve the state of knowledge in the basin.

“The cooperation between our two countries resulted in the collection of key information about our shared groundwater resources,” said U.S. Commissioner Edward Drusina. “These types of partnerships benefit scientists and water managers in both countries.”

“The information included in this joint study improves our understanding of the San Pedro River transboundary aquifer and provides a more solid basis for decision making related to water management in both countries,” said Mexican Commissioner Roberto Salmon.

The technical team for this study included personnel from the U.S. Geological Survey (USGS), Mexico’s National Water Commission (CONAGUA), and two state universities, the University of Arizona and the University of Sonora, working together under the auspices of the IBWC. Funding came from IBWC, USGS, CONAGUA, and the University of Arizona. 

Binational Study of the Transboundary San Pedro Aquifer (English)

Binational Study of the Transboundary San Pedro Aquifer (Spanish)

The 2017 TAAP-A/S Bulletin on the Binational Study of the Transboundary San Pedro Aquifer can be downloaded in .pdf format here. 

The 2013 TAAP-A/S Fact Sheet can be downloaded in .pdf format. The bilingual/bilingue Fact Sheet is here.

Background

TAAP-A/S (the transboundary Santa Cruz and San Pedro aquifers) is a federally funded program co-hosted between the USGS Arizona Water Science Center in Tucson, Arizona and the Water Resources Research Center (WRRC) at the University of Arizona. The program originates from U.S. Public Law 109-448, signed by the President on December 22, 2006 as the Transboundary Aquifer Assessment Act. The Act applies to the states of Texas, New Mexico, and Arizona where four transboundary aquifers have been designated for priority assessment; those being the Hueco Bolson and Mesilla Basin aquifers in the greater El Paso / Ciudad Juárez region, and the Santa Cruz and San Pedro aquifers across the Arizona – Sonora border (see map). TAAP-A/S is designated to operate for 10 years, with $50 million authorized for appropriation over that time period.

Aside from the USGS, WRRC and Udall Center for Studies in Public Policy at the University of Arizona, a variety of other U.S. and Mexican stakeholders participate in priority setting for the assessment process. TAAP-A/S has been designated a case study by the UNESCO Internationally Shared Aquifer Resource Management (ISARM) program.

The upper San Pedro and Santa Cruz river basins, south to north drainages which are bisected by the international border, harbor unique human-environment issues. The upper Santa Cruz is marked by the sister cities of Nogales, Arizona and Nogales, Sonora with the Mexican side having an approximate population 10-times that of its northern neighbor. Within the upper San Pedro basin, the cities of Cananea, Sonora and Sierra Vista, Arizona are the urban centers in which the majority of the regional population resides. Economic activity in Cananea is driven by copper mining while the U.S. Army’s Fort Huachuca is a major source of employment for residents of Sierra Vista. Federally mandated sustainability within the Sierra Vista Subwatershed is a driver for regional water conservation efforts. 

Visit the USGS TAAP website

Materials and Activities

Publications

Jacob D. Petersen-Perlman - Ambos Nogales Effluent. Institutional Frameworks for Effluent Water Use in the Ambos Nogales Region. 

Callegary, J.B., Megdal, S.B., Tapia Villaseñor, E.M., Petersen-Perlman, J.D., Minjárez Sosa, I., Monreal, R., Gray, F., Grijalva Noriega, F., 2018, Findings and lessons learned from the assessment of the Mexico-United States transboundary San Pedro and Santa Cruz aquifers: The utility of social science in applied hydrologic research. Journal of Hydrology: Regional Studies.

Sharon B. Megdal and Jacob D. Petersen-Perlman - Groundwater Governance and Assessment in a Transboundary Setting (book chapter in Velma I. Grover and Gail Krantzberg (eds.) Lake Governance. CRC Press)

Sharon B. Megdal - Reflections on the 10th Anniversary of the Transboundary Aquifer Assessment Program and the Importance of its Joint Cooperative Process

Sharon B. Megdal - Public Policy - The Cooperative Framework for the Transboundary Aquifer Assessment Program: A Model for Collaborative Transborder Studies

Callegary, J.B., Minjárez Sosa, I., Tapia Villaseñor, E.M., dos Santos, P., Monreal Saavedra, R., Grijalva Noriega, F.J., Huth, A.K., Gray, F., Scott, C.A., Megdal, S.B., Oroz Ramos, L.A., Rangel Medina, M., Leenhouts, J.M., 2016, Binational Study of the Transboundary San Pedro Aquifer: International Boundary and Water Commission. 

Five-year interim report of the United States-Mexico Transboundary Aquifer Assessment Program: 2007--2012

Localizing Decision-Making in the Bi-National US-Mexico upper San Pedro River-July 12-14, 2011

The Importance of Institutional Asymmetries to the Development of Binational Aquifer Assessment Programs: The Arizona-Sonora Experience

Institutional Assessment of the Transboundary Santa Cruz and San Pedro Aquifers on the United States-Mexico border (p. 453)

Joint Report of the Principal Engineers Regarding the Joint Cooperative Process United States-Mexico for the Transboundary Aquifer Assessment Program

Front-row view of federal water lawmaking shows process works-U.S. Mexico Transboundary Aquifer Assessment Act pondered, passed, and signed (p. 11)

Related Publications

Climate Change and Water Resources Management in the Upper Santa Cruz River, Arizona - Journal of Hydrology, 2015

Water Resources Vulnerability to Climate Change in the Upper Santa Cruz River, Arizona - Proceedings of the 7th International Congress on Environmental Modelling and Software, 2014

Groundwater Use and Re-use in the Transboundary Santa Cruz River Basin - World Water Development Report, 2012

Climate Change and Popluation Impacts on the Transboundary Santa Cruz Aquifer - Climate Research, 2012

Poster

XVI World Water Congress. The Transboundary Aquifer Assessment Program and the Binational Study of the San Pedro Aquifer.  29 May – June 3, 2017

2015 UA CALS Poster Forum on October 29, 2015

  • Elia Tapia- The Transboundary Aquifer Assessment Program and the San Pedro River Aquifer Binational Report

Presentations

Two Nations One Water US-Mexico Border Water Summit; March 1-2, 2018

  • The Transboundary Aquifer Assessment Program: Past, Present, and Future
  • Implications of Precipitation Uncertainties to Water Resources in the Transboundary Santa Cruz Basin

Universities Council on Water Resources/The National Institutes for Water Resources Annual Conference; June 14, 2017

  • The U.S. Mexico Transboundary Aquifer Assessment Program in Arizona: Current and Future Efforts

Shared Borders of North America World Water Congress Special Session Part 2: Policy Issues May 30, 2017

  • The Joint Cooperative Framework for the Transboundary Aquifer Assessment Program

American Association of Geographers Annual Meeting, Boston, Massachusetts, USA; April 9, 2017

  • Efforts Toward Transboundary Groundwater Assessment and Governance: Transboundary Aquifer Assessment Program in Arizona and Sonora

Drylands, Deserts and Desertification Conference; Ben Gurion University, Sde Boqer Campus, Israel; November 20, 2014

  • Transboundary Aquifer Assessment at the United States-Mexico Border

Session on Managing the National Water Sector. Tel Aviv, Israel; October 22, 2013

  • Useful Lessons from Transboundary Water Efforts along the United States-Mexico Border

Arizona-Mexico Commission Water and Environment Committee; June 14, 2013

  • Update on the Transboundary Aquifer Assessment Program (TAAP): Santa Cruz and San Pedro Aquifers

Workshop on Cooperation Across and Within Jurisdictions and Levels for Good Water Governance – Local to Global; September 3, 2013

  • Governance Asymmetries and Water Cooperation along the United States-Mexico Border

Binational Border Water Resources Summit: Past, Present and Future.  Ciudad Juarez, Chihuahua, Mexico and El Paso, Texas, USA;  September 28-29, 2012.

  • Plácido dos Santos -  The U.S.-Mexico Transboundary Aquifer Assessment Program (TAAP): Focus on the Arizona-Sonora collaboration. The Binational Assessment of the Santa Cruz and San Pedro Aquifers

Arizona-Mexico Commission Plenary Session - Water and Environment Committees;  June 8, 2012

  • James Callegary, Christopher Scott, Sharon Megdal and Plácido dos Santos - Binational Assessment of the Santa Cruz and San Pedro Aquifers:  Update of Arizona-Sonora collaboration under the Transboundary Aquifer Assessment Program (TAAP)

Water Committee of the Arizona-Sonora Commission; June 3, 2011

  • Update on the Arizona-Sonora portion of the United States-Mexico Transboundary Aquifer Assessment Program

UNESCO-IHP, ISARM and PCCP Programmes International Conference- Transboundary Aquifers: Challenges and new directions: Paris, France; December 7, 2010   

  • Sharon Megdal- Institutional Assessment of the Transboundary Santa Cruz and San Pedro Aquifers of the United States-Mexico Border

Aside from the above presentation, the paper written for this conference can also be downloaded, either in English or Spanish.

Arizona Hydrological Society Symposium- Dryland Hydrology: Global Challenges, Local Solutions: Tucson, Arizona; September 3, 2010.

  • Prescott Vandervoet - State of the Santa Cruz and San Pedro Transboundary Aquifers
  • Lucas Oroz / Florencio Diaz – Proposal for sustainable use of the Santa Cruz River and San Pedro River aquifers in Sonora, Mexico
  • James Callegary and Chris Eastoe - Sources of shallow riparian groundwater in the San Pedro and Santa Cruz basins, southern Arizona: a review of stable isotope evidence
  • Robert Varady - Transboundary Aquifer Institutions, Policies, and Governance: A Global Perspective on Arizona-Sonora Aquifers
  • Margaret Wilder – Ambos Nogales: Water, Vulnerability, and Institutional Complexity
  • Andrea Prichard – Drought and Urbanization: Water Supply Challenges of Nogales, Sonora

Scientific Segment of the 19th Session of the Intergovernmental Council of the UNESCO International Hydrological Programme (IHP): Paris, France; July 7, 2010

  • Sharon Megdal- Institutional Mechanisms for the Assessment and Management of Transboundary Aquifers: The Importance of Partnerships

World Water Week- Responding to Global Changes: Accessing Water for the Common Good, with Special Focus on Transboundary Waters: Stockholm, Sweden; August 20, 2009.

  • Sharon Megdal- The U.S.-Mexico Transboundary Aquifer Assessment Program: The Arizona-Sonora Portion as a Case Study.

International Conference on Water Scarcity, Global Changes, and Groundwater Management Responses: Irvine, California; December 2, 2008

  • Christopher Scott- Building Shared Vision: Assessment of Transboundary Aquifers along the United States – Mexico Border.

Data/Databases

TAAP-A/S has compiled two databases of published materials related to groundwater in the binational upper Santa Cruz and San Pedro basins. These databases are available for download in both Adobe Acrobat PDF and MS Excel format, though due to character input limits, certain fields in the Excel version will be incomplete.

The TAAP-A/S database is currently in draft format, and certain fields have not been completely reviewed. The files are being made available in draft format. For reference purposes, please cite as: Santa Cruz (or San Pedro) Database, Transboundary Aquifer Assessment Program- Arizona/Sonora. University of Arizona, 2010. Include the date that file was accessed and web address. 

  • TAAP-A/S Santa Cruz (Adobe Acrobat PDF)
  • TAAP-A/S Santa Cruz (MS Excel)
  • TAAP-A/S San Pedro (Adobe Acrobat PDF)
  • TAAP-A/S San Pedro (MS Excel)

Climate Change Impact Assessment in the Upper Santa Cruz River Basin

Workshops/Fora

On June 20, 2017 TAAP-A/S hosted a forum entitled "The Binational Study of the Transboundary San Pedro Aquifer: Results and Future Directions" in Sierra Vista. The purpose of the event was to share results from the Binational Aquifer Study of the San Pedro Aquifer and to discuss future directions for studying the aquifer. Presentations were given on the TAAP, the challenges and efforts associated with developing a binational study, and the results of the binational study. The forum agenda contains links to all presentations made.

Download workshop agenda

On November 3 and 4, 2009 TAAP-A/S hosted a workshop entitled “Developing a Work plan for the Santa Cruz and San Pedro Aquifers”. The purpose of this event was to review progress of TAAP-A/S and confirm or modify priorities in the draft work plan that will guide assessment of the Santa Cruz and San Pedro aquifers. Over 50 participants gathered during the two-day event, which culminated in breakout groups providing feedback on the TAAP-A/S work plan for priority assessment activities. The workshop agenda contains links to all presentations made. 
Download workshop agenda 
Download workshop report
 

 

 

 

 

 

Municipal provision of groundwater to Cananea, Sonora requires pumping facilities to push the water uphill from the well field on the San Pedro River to the urban area.

 

Surface flow of the Santa Cruz River at the Tubac Bridge is largely composed of treated effluent released by the Nogales International Wastewater Treatment Plant, located approximately 20 kilometers upstream, to the south.

 

 

We tackle key water policy and management issues, empower informed decision-making, and enrich understanding through engagement, education, and applied research.

Give Today
Weekly Wave

Keep up with our news and events with a subscription to our Weekly Wave.

Subscribe

Reach Out

  • 350 N Campbell Ave
    Tucson, AZ 85719
  • (520) 621-9591
  • (520) 792-8518
  • Email Us
  • Directory

Follow Us

  • Facebook
  • Twitter
  • YouTube

© 2019 The Arizona Board of Regents on behalf of The University of Arizona.