The Sun Valley Watershed is located in the San Fernando Valley, approximately 14 miles
northwest of downtown Los Angeles. It encompasses the communities of Sun Valley and
North Hollywood in the City of Los Angeles.
The Sun Valley Watershed contains an area of approximately 2,800 acres (4.4 square miles)
and spans roughly 6 miles in length from north to south. The watershed is in an urban area
consisting of industrial, commercial, and residential uses. The northern portion of the
watershed is developed mostly with industrial uses, while the southern portion is primarily
The soil types in the watershed include Tujunga fine sandy loam, Altamont clay loam, and
Hanford gravelly sandy loam. These sandy soils allow water to easily infiltrate into the
groundwater basin below. Most of the rainfall in the Sun Valley Watershed occurs between
the months of November and April. Due to the slight slope of the land, storm water that is
not captured travels southward over street surfaces and drains into the Los Angeles River.