The State of the Aquifers The Transboundary Santa Cruz and San Pedro River basins

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1 The State of the Aquifers The Transboundary Santa Cruz and San Pedro River basins Prescott Vandervoet Christopher Scott Sharon Megdal The University of Arizona 2010 AHS Annual Symposium: "Dryland Hydrology: Global Challenges, Local Solutions Co-hosted with the International Association of Hydrogeologists 9/2/10 AHS Annual Symposium 1

2 Overview What is the status of water resources and management of the transboundary Santa Cruz and San Pedro aquifers? What factors determine the status? Natural Environment Use (pumping) Governance Water quality 9/2/10 AHS Annual Symposium 2

3 Variability Monthly Mean Discharge (cfs) July April January October Nogales Gage, USGS Palominas Gage, USGS July April January October 9/2/10 AHS Annual Symposium 3

4 Nogales, Sonora Santa Cruz, Sonora Cananea, Sonora Naco, Sonora Population Drivers of Future Demand Continued growth (projections from 2005) Municipio-level population, CONAPO, , , , , Cochise County Santa Cruz County Sierra Vista 120, ,000 80,000 60,000 Cochise County Santa Cruz County Sierra Vista Nogales Nogales, AZ 40, , US Census Bureau, 2010 AZ Dept. of Commerce, /2/10 AHS Annual Symposium 4

5 9/2/10 AHS Annual Symposium 5

6 Water Use Demand and changing sectoral water use Municipal Industrial Agricultural Af/yr in Santa Cruz AMA, ADWR Af/yr in Sierra Vista subwatershed, ADWR 9/2/10 AHS Annual Symposium 6

7 9/2/10 AHS Annual Symposium 7

8 Drivers of future scenarios Demand and changing sectoral water use Water use in Santa Cruz basin, Mexico (not including Nogales Wash) Scott et al., in review 9/2/10 AHS Annual Symposium 8

9 Groundwater Balance Recharge and pumping Acre-Feet Santa Cruz Million Cubic Meters Acre-Feet San Pedro Million Cubic Meters Supply 39, , , US Demand 21, , Supply?????? 33, Mex Demand , Sources: USPP Report, ADWR, Conagua Estudios de Disponibilidad 9/2/10 AHS Annual Symposium 9

10 Regional use/availability breakdown water withdrawn by basin/nation per year San Pedro Basin Santa Cruz Basin AF 20.9 MCM AF 29.1 MCM AF 25.0 MCM AF 28.7 MCM 309 AF 0.38 MCM Santa Cruz, Arizona Nogales Wash, Sonora Santa Cruz, Sonora San Pedro, Sonora San Pedro, Arizona Sources: ADWR, CONAGUA, USPP 9/2/10 AHS Annual Symposium 10

11 Upper Santa Cruz Groundwater Balance and SCAMA tasked with maintaining sustainable yield Nogales, Sonora has at times been forced to purchase water from Nogales, AZ Upper San Pedro In 2004 local actors charged with restoring and maintaining sustainable yield in Arizona Drawdowns noted of up to 3 meters between along river channel in Mexico Management 9/2/10 AHS Annual Symposium 11

12 Management Important to recognize differing nature of water management How do unique management regimes interact across the border within shared basins? 9/2/10 AHS Annual Symposium 12

13 Differing management regimes Source: Milman and Scott, /2/10 AHS Annual Symposium 13

14 Description of Management Responsibilities for Agencies within Basins Arizona Arizona Department of Water Resources Administers and enforces State groundwater code US Geological Survey collects information needed to understand water resources. US Bureau of Land Management manages the nation's public lands and resources. balancing recreational, commercial, scientific and cultural interests and strives for long-term protection of renewable and nonrenewable resources. Utilities Sonora National Water Commission Administer and preserve national waters to achieve their sustainable use. State Water Commission Promote the coordinated development and efficiency of water resources in Sonora. Municipal Utilities Provisioning and supply to urban users 9/2/10 AHS Annual Symposium 14

15 Binational Cooperation and Initiatives Arizona Mexico Commission State-level work group since 1959 with 13 binational committees (including water) Border Environmental Cooperation Commission Preserve, Protect, Enhance human health and environment along border Transboundary Aquifer Assessment Program Transboundary Aquifer Assessment Program (TAAP) U.S. Federal Law Secretary of Interior to systematically assess priority transboundary aquifers Santa Cruz and San Pedro identified on Arizona/Sonora border Approval for appropriation of 50 million dollars over 10-year period Collaborative project between USGS and Water Resource Centers within Texas, New Mexico, and Arizona 9/2/10 AHS Annual Symposium 15

16 Transboundary Aquifer Assessment Program Goals and Achievements Formation of binational work group to prioritize assessment activities Engagement of stakeholders throughout basins and administrative areas. Interaction at regional and binationally-focused meetings regarding groundwater issues. 9/2/10 AHS Annual Symposium 16

17 Transboundary Aquifer Assessment Program Goals and Achievements Design of work plans for assessment of shared groundwater resource Beginning stages of binationally coordinated aquifer studies in Mexico Collaborators include: ADWR, CONAGUA, CEA- Sonora, USPP, FOSCR, among others. 9/2/10 AHS Annual Symposium 17

18 Contacts and Webpage Prescott Vandervoet Christopher Scott Sharon Megdal James Callegary 9/2/10 AHS Annual Symposium 18

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