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The Transboundary Aquifer Assessment Program and the San Pedro River Aquifer Binational Report
Photo taken 19
August 2009
TAAP Workshop and Binational Advisory
Committee meeting
Development
of the
cooperative
framework by
the IBWC in
2009.
*Understand the current state of knowledge with respect to
climate, geology, soils, land cover, land use, and hydrology
of the Santa Cruz and San Pedro aquifers in this binational
context
*Compile and create a database of scientific information
from both countries
*Identify data gaps and identify what data would be
necessary to update, in a subsequent phase, the
hydrologic model of the aquifer system, including surface-
and groundwater interactions on a binational level
*International Boundary and Water Commission United States and Mexico. *For Mexico: National Water Commission and University of Sonora. *For the United States: United States Geological Survey, University of Arizona Water Resource Research Center.
Authority
Carried out by the US and Mexico in accordance with resolution 6 of Minute 242 of the International Boundary and Water Commission (IBWC), entitled “Permanent and Definitive Solution to the International Problem of the Salinity of the Colorado River,” and the "Joint Report of the Principal Engineers Regarding the Joint Cooperative Process United States-Mexico for the Transboundary Aquifer Assessment Program."
Objectives
Participating Agencies
The San Pedro Report: Table of Contents
1. INTRODUCTION
1.1.Background
1.2.Study Area
1.3.Study Objectives
1.4.Previous Studies
1.5.Geographical Context
1.6.Binational Socioeconomic
Environment
1.7.Binational Water Management
Environment
1.8.Technical Work Undertaken
1.9.Methodologies and Techniques
Applied 2. PHYSICAL GEOGRAPHY
2.1.Physiography
2.2.Hydrography
2.2.1.Hydrologic Region
2.2.2.Hydrometry
2.3.Climatology
2.4.Soils
2.5.Vegetation 3. HYDROGRAPHY AND
HYDROMETEOROLOGY
3.1.Climatological Analysis
3.2.Precipitation and Evapotranspiration
3.3.Surface Hydrological System
3.4.Drainage Types and Maximum
Stream Order
3.5.Terrain Slopes
3.6.Land Cover and Use
4. CONCEPTUAL GEOLOGIC MODEL
4.1.Regional Geographical Context
4.2.Stratigraphy
4.3.Structural Geology
4.4.Three-dimensional Geology of the
Subsurface
4.5.Depth to Basement and Structure
4.6.Characteristics of the Sedimentary Fill
5. PIEZOMETRY AND HYDRAULIC
PARAMETERS
5.1.Comprehensive Well Survey
5.2.Reconstruction of the History of
Groundwater Withdrawals
5.3.Analysis of System’s Piezometric Behavior
5.4.Definition and Interpretation of Subsurface
Hydraulic Parameters
6. HYDROGEOLOGY
6.1.Hydrogeological Basement
6.2.Hydrostratigraphic Units
6.3.Definition of the Aquifer System
7. HYDROGEOCHEMISTRY
7.1.Hydrogeochemical Sampling
7.1.Temperature and pH
7.2.Water Quality
7.3.Identification of Water Families 7.4. Electrical Conductivity and Total
Dissolved Solids
7.5.Stable Isotopes
8.CONCEPTUAL MODEL OF
HYDRODYNAMIC BEHAVIOR
8.1.Groundwater Flow System
8.2.Pre-development
Hydrodynamic Behavior
8.3.Post-development
Hydrodynamic Behavior
9. CONCLUSIONS AND
RECOMMENDATIONS
10. REFERENCES
Binational Maps Prepared in English and Spanish
- 20 Binational maps were generated with information about climate, hydrology, geology, land use, soil distribution, vegetation, etc.
- 11 Binational water quality maps were created with information on pH distribution, electric conductivity, groundwater temperature and concentrations of major ions (Ca, Cl, Mg, Na, K, HCO3, SO4).
- 2 Binational maps with information on groundwater levels for the year 2011.
The San Pedro Report will be the first-ever binational
aquifer assessment prepared and released
simultaneously in English and Spanish by the IWBC.
University of Arizona Water Resources Research Center
Elia M. Tapia, Dr. Sharon B. Megdal
The Binational Experience
Sharing data and information that are accepted in
both countries creates the basis for cooperation
and a common understanding in support of both
countries’ sustainable use and protection of water
resources, and achieving sustainable economic
development. In addition, the intellectual and
interpersonal interaction improves the relationships
needed to coexist in harmony at a local and
international level.
Recommendations from the Binational Team
In order to achieve better understanding of the transboundary aquifer systems,
the binational team recommends continuing the scientific collaboration on these
aquifers and on other priority aquifers along the United States-Mexico border.
The development of more complete, publicly available, shared databases
offering reliable information to the public can be used for planning and for
managing natural resources along the the border area.
Acknowledgements
This work was supported by the Technology and Research Initiative Fund, through the University of
Arizona Water Sustainability Program and Water Resources Research Center. We acknowledge the
work of to the technical team for this study, which included personnel from the two federal
governments (CONAGUA and USGS) and two state universities (University of Sonora and University
of Arizona) under the auspices of the International Boundary and Water Commission (IBWC).
Examples of
Mapping
Efforts
- Different classification units for
both countries were unified to
obtain a binational product.
Hydrostratigraphic Units Locator Maps
English and
Spanish version. Geology
Examples of Binational Maps
- English and Spanish versions available.