The Centennial Wash Watershed (HUC 15070104) covers an area of approximately 3,330 square kilometers in southeastern Arizona. The watershed is characterized by a high desert climate with hot summers and mild winters. The hydrology of the area is dominated by intermittent streams and washes, which are typically dry for most of the year. The watershed receives most of its precipitation during the summer monsoon season. Snowpack is generally not a significant factor in the region. Surface water in the watershed is limited, and the area relies heavily on groundwater resources. The primary reservoir in the area is the San Carlos Reservoir, which is used for irrigation and flood control. Climate change is expected to have significant impacts on the region, including increased temperatures and decreased precipitation. These changes could have serious implications for water resources in the area, particularly with regards to groundwater availability.