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 1 AHS Annual Symposium
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The State of the AquifersThe Transboundary Santa Cruz and San Pedro
River basinsPrescott Vandervoet
Christopher ScottSharon 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 1AHS Annual Symposium
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
Water use in Santa Cruz basin, Mexico (not including Nogales Wash)
Groundwater BalanceRecharge and pumping
Acre-Feet Million Cubic Meters
Acre-Feet Million Cubic Meters
Supply 39,600 – 142,900 48.8 - 176 18,000 22.2
Demand 21,105 26.0 16,920 20.9
Supply ??? ??? 33,200 41.0
Demand 23300 28.7 23,595 29.1
9/2/10 AHS Annual Symposium 9
Sources: USPP 2007 321 Report, ADWR , Conagua Estudios de Disponibilidad
US
Mex
Santa Cruz San Pedro
21105 AF25.0 MCM
309 AF0.38 MCM
23300 AF28.7 MCM
23595 AF29.1 MCM
16920 AF20.9 MCM
Santa Cruz, Arizona
Nogales Wash, Sonora
Santa Cruz, Sonora
San Pedro, Sonora
San Pedro, Arizona
Regional use/availability breakdown
9/2/10 AHS Annual Symposium 10
Sources: ADWR, CONAGUA, USPP
water withdrawn by basin/nation per year
Santa Cruz BasinSan Pedro Basin
Groundwater Balance and Management
• Upper Santa Cruz– 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 1995-2000 along river channel in Mexico
9/2/10 11AHS Annual Symposium
Management
9/2/10 12AHS Annual Symposium
• Important to recognize differing nature of water management
• How do unique management regimes interact across the border within shared basins?
Differing management
regimes
9/2/10 AHS Annual Symposium 13
Source: Milman and Scott, 2010
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
Binational Cooperation and Initiatives• Arizona Mexico
Commission– State-level work group since
1959 with 13 binational committees (including water)