The Floodplain Management Act of 1973 authorized Arizona counties to adopt rules and regulations concerning management of floodplain areas. The Pima County Board of Supervisors, which sits as the Pima County Flood Control District Board of Directors, organized the Pima County Flood Control District on June 5, 1978. The District is responsible for floodplain management activities for unincorporated areas in Pima County (with the exception of national forests, parks, monuments, and Indian Nations) and for the City of South Tucson.

This summary report overviews a State of Arizona and U. S. Department of Energy funded drilling project to determine if near-term hot dry rock (HDR) geothermal potential exists in the eastern portion of the White Mountains region of Arizona. A 4,505 feet deep slim-hole exploratory well, Alpine1/Federal, was drilled within the Apache-Sitgreaves National Forest at Alpine Divide near the Alpine Divide camp ground about 5 miles north of Alpine, Arizona in Apache County (Figure 1). A comprehensive technical report, in two parts, details the results of the project. Part 1, Alpine1/Federal, Drilling Report, discusses the drilling operations,
logging program, permitting and site selection for the hole. Part 2, Temperature Gradients, Geothermal Potential, and Geology, summarizes the temperature gradients, heat flow, geothermal potential, and subsurface geology.

In March 1971, the Arizona Bureau of Mines—predecessor of today’s Arizona Geological Survey—published the first issue of Fieldnotes. For nearly 40 years, Fieldnotes, and its successor, Arizona Geology, showcased all things geologic in Arizona. From the onset, the quarterly magazine printed topical pieces on Arizona’s mineral resources, energy potential, and environmental geology. In Fall 1988, Fieldnotes became Arizona Geology, and the newsletter was retailored to meet the needs of Arizona’s exploding population. There was increased focus on articles describing geologic phenomena—flash floods and regional floods, earthquakes, landslides, volcanism, swelling and shrinking soils, earth fissures, and more—with the most immediate and adverse impact on the lives and properties of our fellow Arizonans. But that was then and this is now! As print publication costs rise through the stratosphere, we simply can no longer afford to print and mail 4100 copies of Arizona Geology quarterly. Arizona Geology is going digital. We are suspending the print publication immediately and we are moving from a quarterly schedule to three times annually.

This white paper has been created by Arizona Land Subsidence Group to help educate stakeholders and decision makers by describing the geological features and processes of land subsidence and earth fissures, and the hazards they create. This paper presents the current and future technical needs that exist in terms of basic knowledge, available data, and the state of professional practice.