The San Ambrosia Santa Isabel Watershed (HUC 13080002) is located in Southern California and covers an area of 63.5 square miles. The area is characterized by a Mediterranean climate with hot, dry summers and mild, wet winters. Hydrological data indicate that the watershed receives an average of 15 inches of precipitation annually, with the majority of the rainfall occurring between November and April. The watershed is primarily composed of chaparral vegetation, and the steep terrain contributes to high surface runoff during rainy periods. The watershed feeds into the San Diego River and has several reservoirs, including Lake Henshaw and Lake Sutherland. The snowpack in the region is generally limited, with most precipitation falling as rain. Recent climate data suggests that the area is experiencing a trend towards increased temperatures, with corresponding decreases in precipitation.