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Hydrologic and Legal Issues of the Upper San Pedro

River Basin, Arizona

compiled on

December 3, 1994

by

Laurel J. Lacher

Department of Hydrology and Water Resources

University of Arizona

Table of Contents

Geology and Geography

Surface Water

Precipitation and Climate

Vegetation and Wildlife

San Pedro Riparian National Conservation Area (SPRNCA)

Groundwater/Subsurface Regime

Regional Aquifer

Floodplain Aquifer

Human Development and Use

Economy

Water Uses

Natural Depletions

Cultural Uses

Irrigated Acreage

Groundwater Exploitation

Effects of Pumping on Groundwater System

Consumptive use in Mexican Portion of Upper San Pedro Basin

Effects of Wells on Surface Water

Surface Water Exploitation

Changes in Surface Water Flow Regime

Water Quality

Groundwater

Surface Water

Hydrologic Modeling Studies

Arizona Water Commission (1974)

Freethey (1982)

Putman, et al (1988)

U.S. Corps of Engineers, Los Angeles District (1987)

Rovey (1989)

Vionnet/Maddock (1992)

Legal Aspects

AZ Surface Water Law

Arizona Groundwater Code

Court Decreed Rights

Federal Law Rights

Gila River System General Adjudication

San Pedro River Watershed Adjudication

Brightline and Appropriable Subflow

Summary and Conclusions

Bibliography

 

List of Figures

Figure 1: Location Map of San Pedro Basin

Figure 2: Map of San Pedro Basin Showing Mountains

Figure 3: Generalized Cross-Section of the Upper San Pedro River Basin

Figure 4: Total Pumpage for the Upper San Pedro Basin, 1966-1985

 

List of Tables

Table 1: Average Annual Discharge, 1968-1976

Table 2: Temperature and Precipitation Data

Table 3: Total Volume of Recoverable Groundwater Held in Storage in the Upper San Pedro Basin

Table 4: Population Estimates for the Upper San Pedro Basin

Table 5: Total Consumptive Use by Evaporation and Evapotranspiration in the Upper San Pedro Basin (ac-ft/yr)

Table 6: Consumptive Use by Phreatophytes in the Upper San Pedro Basin

Table 7: Groundwater Depletions in U.S. Portion of Upper San Pedro Basin, 1989-90 (ac-ft/yr)

Table 8: Water Budget for Inner Valley Area of Upper San Pedro Basin for Period 1968 to 1976

Table 9: Comparison of Selected Upper San Pedro Basin Modeling Studies

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