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The State of the Aquifers - The University of Arizona · PDF file 2016-11-15 · The...

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  • 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 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

    9/2/10 2AHS Annual Symposium

  • Variability Monthly Mean Discharge (cfs)

    9/2/10 AHS Annual Symposium 3

    October January

    April July

    0

    100

    200

    300

    400

    500

    600

    700

    800

    October January

    April July

    0 100 200 300 400 500 600 700 800 900

    1000

    Nogales Gage, USGS

    Palominas Gage, USGS

  • Population Drivers of Future Demand

    Continued growth (projections from 2005)

    9/2/10 4AHS Annual Symposium

    0

    20000

    40000

    60000

    80000

    100000

    120000

    140000

    1950 1960 1970 1980 1990 2000

    Cochise County Santa Cruz County Sierra Vista

    Nogales, AZ

    0

    20,000

    40,000

    60,000

    80,000

    100,000

    120,000

    140,000

    160,000

    180,000

    200,000

    2010 2012 2014 2016 2018 2020 2022 2024 2026 2028 2030

    Cochise County Santa Cruz County Sierra Vista

    Nogales

    US Census Bureau, 2010 AZ Dept. of Commerce, 2010

    0

    50000

    100000

    150000

    200000

    250000

    300000

    350000

    20 05

    20 07

    20 09

    20 11

    20 13

    20 15

    20 17

    20 19

    20 21

    20 23

    20 25

    20 27

    20 29

    Nogales, Sonora

    Santa Cruz, Sonora

    Cananea, Sonora

    Naco, Sonora

    Municipio-level population, CONAPO, 2010

  • 9/2/10 AHS Annual Symposium 5

  • Water Use

    9/2/10 AHS Annual Symposium 6

    0

    5000

    10000

    15000

    20000

    25000

    1985 1990 1995 2000 2005

    Demand and changing sectoral water use

    Af/yr in Santa Cruz AMA, ADWR

    0

    5000

    10000

    15000

    20000

    25000

    2000 2005 2010 2020 2030

    Municipal

    Industrial

    Agricultural

    Af/yr in Sierra Vista subwatershed, ADWR

  • 9/2/10 AHS Annual Symposium 7

  • Drivers of future scenarios

    9/2/10 AHS Annual Symposium 8

    Demand and changing sectoral water use

    Scott et al., in review

    Water use in Santa Cruz basin, Mexico (not including Nogales Wash)

  • Groundwater Balance Recharge 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 AF 25.0 MCM

    309 AF 0.38 MCM

    23300 AF 28.7 MCM

    23595 AF 29.1 MCM

    16920 AF 20.9 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)

    • 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 109-448 – 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

  • 9/2/10 AHS Annual Symposium 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.

  • 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

  • Contacts and Webpage Prescott Vandervoet [email protected] Christopher Scott [email protected]

    9/2/10 AHS Annual Symposium 18

    Sharon Megdal [email protected] James Callegary [email protected]

    www.cals.arizona.edu/azwater/taap

    mailto:[email protected]� mailto:[email protected]

    The State of the Aquifers�The Transboundary Santa Cruz and San Pedro River basins� Overview Variability�Monthly Mean Discharge (cfs) Population Drivers of Future Demand Slide Number 5 Water Use Slide Number 7 Drivers of future scenarios Groundwater Balance�Recharge and pumping Regional use/availability breakdown Groundwater Balance and Management Management Differing management regimes Description of Management Responsibilities for Agencies within Basins Binational Cooperation and Initiatives Transboundary Aquifer Assessment Program Transboundary Aquifer Assessment Program Contacts and Webpage

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