Alluvial fans are ubiquitous geomorphological features that occur throughout the world, regardless of climate, at the front of mountains as the result of erosion and deposition. They are more prominent in semi- and arid climates simply because of the lack of vegetative cover that masks their fan shapes in more humid areas. From both engineering and geological viewpoints, alluvial fans present particular fluvial and sedimentation hazards in semi- and arid regions because episodic rainfall-runoff events can result in debris, mud, and fluvial flows through complex and, in some cases, migratory channel systems. Further, in semi- and arid climates alluvial fans often end in terminal or playa lakes. Given the uniform topography of playa lakes, these features often present ideal locations for facilities such as airports; however, regardless of the engineering advantages of the topography, the episodic and often long-term flooding of these lakes attracts migratory birds. The purpose of this volume is to summarize the current state-of-the-art, from the viewpoint of engineering, in the identification and mitigation of flood hazard on alluvial fans; and to accomplish this a fundamental understanding of geology is required.

Tucson is a vibrant, growing city, but beneath the sunny surface lies a dark history. Eva Dugan was convicted of murder and hanged here, the first woman to be executed in the state of Arizona. Gangsters like Joe Bonanno and bank robber John Dillinger were drawn to this corner of the Southwest, and it was home to killers like Robert John Bardo and Charles Schmid, a serial killer nicknamed the "Pied Piper of Tucson." In 1892, William Elliott, stabbed by a notorious criminal, became the first Tucson police officer to lay down his life in pursuit of justice, but he wouldn't be the last. Join author Patrick Whitehurst as he delves into the chilling history of Tucson.

Arizona is known for its exceptional variety of topography and ecosystems. From stands of saguaro cacti and plunging canyons to high alpine forests, many are fragile areas in need of protection. All told, Arizona has some 92 wilderness areas, and author Tom Dollar provides informative descriptions for backcountry travelers wishing to explore those 65 areas accessible to the public. (Many areas are so remote they are virtually inaccessible.) This guidebook includes suggestions for hikers, along with insights into the unique natural history of such areas as Paria Canyon, Mazatzal, Organ Pipe, and Kachina Peaks wildernesses. Outdoor photographer Jerry Sieve's dramatic photographs illustrate each of the areas described.