John T. Murphy, Computational Postdoctoral Fellow, Decision and Information Sciences Division (DIS) and ALCF, will present an introduction to his work on the Hohokam Water Management Simulation II, a simulation (in progress) of an archaeologically attested irrigation society that flourished and then declined in central and southern Arizona over roughly 1,000 years, from approximately 400 to 1450 AD. Technical aspects of large-scale archaeological simulation (especially in high-performance computing environments) will be presented against a background of the current field of computational social science and the use of agent-based models to understand complex social and coupled human-natural systems.