The San Rafael Watershed, located in central California, covers an area of approximately 1,183 square miles. It is a vital source of water for Marin County and provides water to the Marin Municipal Water District. The watershed is predominantly mountainous, with elevations ranging from sea level to over 4,000 feet. The hydrology of the watershed is dominated by the winter storms that bring the majority of the precipitation. The snowpack in the Sierra Nevada Mountains provides a significant amount of the surface water for the watershed. The watershed is home to several reservoirs, including Lake Lagunitas and the Kent Lake Reservoir. The reservoirs store water for the dry season and also provide recreational opportunities. The watershed experiences a Mediterranean climate with warm, dry summers and wet winters. In recent years, there has been a trend towards drier and shorter winters, leading to concerns about water availability in the future.