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Water Basics
Agriculture
California is an agricultural leader, and it depends on irrigation.
The California Water System
Our water system is a complex relationship between nature and manmade structures that move water.
Climate Change Basics
Climate change can have a profound impact on California’s water resources.
Conservation Tips
Water conservation is part of the California lifestyle.
The Delta
The Sacramento-San Joaquin Delta is the heart of California’s water system.
Drought
Drought is a reoccurring feature of California’s climate.
Environment
California's unique geography and climate foster a diverse ecosystem that relies on water.
Flood
California is prone to periodic, and sometimes severe, floods.
Groundwater
The water stored beneath our feet is an important water supply source in California.
Glossary
Find definitions of key terms and concepts related to our work.
What We Do
Dam Safety
We provide oversight to the design, construction, and maintenance of over 1,200 dams in California.
Education
We provide resources for teachers and other Californians to learn about the complex world of water.
Emergency Management
We protect life and property from catastrophic events such as flood, drought, and infrastructure fai ...
Flood Preparedness
We work with communities and emergency responders to prepare for flood season.
Infrastructure
We construct, maintain and ensure the safety of a many water infrastructure facilities.
Power
The SWP is the fourth largest producer of energy in the state.
Recreation
The SWP provides extensive recreational activities at and around its reservoirs.
Science
Science is integral to our policy and management decisions.
Sustainability
Our work aims to protect natural ecosystems’ abilities to meet the needs of future generations.
Water Storage & Supply
We operate and maintain the State Water Project and support sustainable groundwater management.
Programs
All Programs
Learn more about our other programs and projects that help sustainably manage California’s water res ...
Bay Delta
Our work in the Sacramento-San Joaquin Delta aims to improve ecosystems and water quality, supply, r ...
California Water Plan
We provide a collaborative planning framework to make informed decisions for our water future.
Division of Safety Dams
DSOD regulates more than 1200 dams to prevent failure, safeguard life, and protect property.
Engineering & Construction
We provide engineering, geology, real estate, and geodetic services for an array of water infrastruc ...
Environmental Services
We conduct scientific and environmental analysis to help protect and restore the environment.
Flood Management
Our work in statewide flood forecasting and flood operations help reduce flood risk.
Groundwater Management
We support the sustainable management of California’s underground water reserves.
Integrated Regional Water Management
We work with regional water managers to implement solutions that increase regional self-reliance.
State Water Project
This water storage and delivery system provides water to almost 27 million Californians and 750,000 ...
Water Use & Efficiency
We assist agencies and individuals with agricultural and urban water conservation.
Climate Change
Managing climate change and its impact of water supply is one of DWR’s core values.
Work with Us
Careers
Join us for a rewarding career ensuring the sustainability of California's water resources.
Grants & Loans
We offer a number of grant and loan programs that support integrated water management activities.
Real Estate
We acquire temporary and permanent land rights to support our mission.
Procurement
We contract for goods and services through our procurement process.
Technical Assistance
We provide technical guidance, assistance, and resources through 4 regional offices.
Tribal Policy
We are committed to open, inclusive, and regular communication with tribal governments, communities.
News
Current Conditions
We provide real-time hydrologic information, including reservoir and river conditions.
DWR Updates
Find feature stories, program updates, videos, and more.
Events
View upcoming and past DWR events
News Releases
View our news releases for the latest information on our work and projects.
Public Notices
Find notices on public hearings, intent to award contracts and grants, and purchases.
Library
Documents
View DWR reports and publications in our document library.
Educational Materials
We provide educational publications to view, download, and order.
Modeling & Analysis
We develop and maintain a number of state-of-the-art models and analytical tools.
Other DWR Portals
DWR maintains several additional web portals containing data and maps. These portals remains unchang ...
Photos
Pixel – our web-based photo gallery – features free downloadable images of California’s natural reso ...
Public Forms
We provide an access point to DWR Public forms. The Directory contains links to electronic versions ...
Videos
View our YouTube channel for videos featuring our projects, facilities, and latest news.
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PDF File
B118 Basin Boundary Description 2003 –4_004_02 Oxnard Subbasin
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_004_03 Mound Subbasin
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_004_04 Santa Paula Subbasin
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_004_05 Fillmore Subbasin
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_004_06 Piru Subbasin
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_004_07 Santa Clara River Valley East Subbasin
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_005 Acton Valley
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_006 Pleasant Valley
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_007 Arroyo Santa Rosa Valley
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_008 Las Posas Valley
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_009 Simi Valley
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_010 Conejo Alley
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_011_01 Santa Monica Subbasin
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_011_02 Hollywood Subbasin
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_011_03 West Coast Subbasin
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_011_04 Central Subbasin
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_012 San Fernando Valley
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_013 San Gabriel Valley
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_015 Tierra Rejada
| (Published Date: March 3, 2020)
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B118 Basin Boundary Description 2003 –4_016 Hidden Valley
| (Published Date: March 3, 2020)
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