1. John Hoffmann Introduction to USGS Arizona Program and Hydrology USGSGeologyMappingBiologyWater Water-Science Centers

2. USGS Water-Science Center Physical Setting Offices, staff, funding Hydrology Programs Laws influencing programs Example programs

3. AZWSC Organization and Staff Program/ support group AZWSC, main office Tucson (~70 total) Tucson Field Office Office for Northern AZ Programs Tempe Field Office Yuma Field Office Hydrologic Data Program 67898 Hydrologic Investigations & Research Programs 238 Administrative Services and Computer Support 8

4. AZWSC Funding, FY06 Total Funding Estimate: $10 million Cooperators }

5. The importance of understanding Arizona’s water resources T O F T O T A L U. S. P O P U L A T I O N POPULATION IN SOUTHWEST PERCENT OF U.S. POPULATION

7. Importance of Ground-Water to the West Percentage of drinking water supplied by ground water

8. Ground-water resources of Arizona

10. Alluvial basins (Basin and Range physiographic province) 72 basins—primary source of ground water; 900 million acre-ft Filled with sediments ranging from a few thousand to 10,000 ft thick Basins categorized to allow transfer of information and allow investigators to make predictions about the impacts of future development within each group Note: Mountain ranges surrounding the basins are crystalline and yield little to no water

11. SPRINGS Low- permeability rocks Flow system conceptual model: Colorado Plateau SPRINGS

12. Influence of Laws on USGS AzWSC Program (Melcher) y Colorado Rover Compact, 1922 y CR Storage Project Act, 1956 y Supreme Court Decree Act, 1956 y Grand Canyon Protection Act, 1992; y National Environmental Policy Act, 1969; 18 others y Endangered Species Act, 1973 y Arizona Groundwater Management Act, 1980/Rural Watershed Initiative y Nuclear Water Policy Act, 1982 y Clean Water Act, 1989 y Section 321 of the Defense Authorization Bill, 2004 y Title II of Yavapai County land Exchange Bill, 2005 y Transboundary Aquifer Bill, 2006 y Lower Colorado River Decree Accounting Project y Grand Canyon Sediment transport Project, y C aquifer Project y Rural Watershed Investigations y Aquifer Storage an Subsidence Project y Death Valley Regional GW Flow Model y Urban Runoff y San Pedro River y Verde River Watershed y Border aquifers LawProgram Water-management related

14. Aquifer-Storage Change and Subsidence Monitoring Stations in the TAMA Directed by Arizona ground- water law ( Arizona Groundwater Management Act, 1980) to attain an annual balance between ground-water withdrawals (Q out ) and recharge (Q in ) by the year 2025 Q in = Q out ΔStorage = 0 Q in – Q out = ΔStorage

15. Original Water Table Volume of Aquifer Drained Aquifer Storage Change Specific Yield × Water Table After Pumping Aquifer Storage Change

16. g = -k  x/mass xx Gravity The simplest type of gravimeter essentially measures the extension of a spring attached to a control mass. unconfined aquifer Δ water table before pumping water table after pumping Δ

17. -60,000 acre-ft ~0.4 ft per year Storage Change in a portion of the Tucson Basin Spring 2005 – Summer 2006 Q in – Q out = ΔStorage

21. Determine the Effects of Ground-Water Overdraft on:  Aquatic Communities  Riparian Areas  Endangered Species

22. Theoretical capture by pumping for 50 years Upper San Pedro Basin in SE Arizona

23. Introduction to USGS Arizona Program and Hydrology Questions? Next up: Jim Leenhouts--San Pedro James Callagary—Geophysical tools