The Amargosa Desert Research Site (ADRS), in the northern Mojave Desert, is about 20 km east of Death Valley National Park. Recognizing the paucity of information on unsaturated-zone hydrology in arid regions, the USGS, in 1983, established the ADRS through agreements with the Bureau of Land Management (BLM) and the State of Nevada. The ADRS serves as a field laboratory for the study of arid-land...