Bulletin 1.pdf - California Department of Water Resources - State of ...

CHAPTER II. SUMMARY
The purpose of this chapter is to outline the nature of the investigation
reported, to describe briefly the physical conditions that govern
occurrence, quantity, and quality of the water resources of California,
and to summarize for the State as a whole, statistical and other information
presented and discussed by major hydrographic Areas in succeeding
chapters. Plate 1, "Map of California," has been included to assist in
following the presentation. It has been placed inside the back cover for
convenience of use.
MAJOR HYDROGRAPHIC AREAS
The State has been divided into seven Areas, numbered from 1 to 7,
which generally coincide with major hydrographic divisions. The portion
of the State included within each Area and the names by which the
Areas are designated are :
1. Borth Ooasta.l Area. Lower Klamath Lake and Lost River
Basins, and all basins draining into the Pacific Ocean from the California­
Oregon state line southerly to the northern boundary of Lagunitas Creek
Basin in Marin County.
2. SaD Franciaeo Bay Area. All basins draining into San Francisco,
San Pablo, and Suisun Bays, and into Sacramento River downstream
from Collinsville; Winter and Browns Islands in Contra Costa
County; basins west of the eastern boundary of Kirker Creek Basin in
Contra Costa County; and basins directly tributary to the Pacific Ocean
from the northern boundary of Lagunitas Creek Basin to the southern
boundary of Pescadero Creek Basin, in San :Mateo and Santa Cnu;
Counties.
3. Central Coastal.Area. All basins draining into the Pacific
Ocean from the southern boundary of Pescadero Creek Basin in Santa
Cruz County, to the southeastern boundary of Rincon Creek Basin in
the western part of Ventura County.
4. South Coastal Area. All basins draining into the Pacific Ocean
from the southeastern boundary of Rincon Creek Basin to the California­
Mexico boundary.
5. Central Valley Area. All basins draining into the Sacramento
and San Joaquin Rivers above the eastern boundary of the San Francisco
Bay Area near Collinsville, including Goose Lake Basin in Modoc
County.
6. Lahontan Area. All basins east of the Santa Ana and Los
Angeles River Basins and aU basins east of the Central Valley Area,
between the California-Oregon boundary and the southern boundary of
basins draining into Antelope Valley and Mojave River, and into Dry
Lake Basin near the California-Nevada line north of Ivanpah.
7. Colorado Desert.Area. All basins east of the South Coastal
Area that drain into the Colorado River within California; also Salton
Sea Basin and local sinks between the southern boundary of the Lahontan
Area and the California-Mexico boundary.
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