◈ Homepage — https://acfloodcontrol.org/Skip to main content WHO WE ARE THE WORK WE DO RESOURCES NOTICES Search for: Flood Protection for Western Alameda County Safeguarding people, property, and the environment Watershed Maps Hydrology & Hydraulics Manual Projects in Your Area Contract with Us Annual Reports Family Flood Plan Watershed Maps There are many different watersheds throughout Alameda County that overlap within cities and subregions. In order to make these watersheds easy to find and understand, The Alameda County Flood Control and Water Conservation District created full-featured, interactive maps of every watershed in the county. Watershed Maps Notices Revenue Enhancement: Investing in Community Resilience Revenue Enhancement: Investing in Community Resilience Notices of Public Hearing on Proposed Benefit Assessment Increase in Zones 2, 4, and 9 Posted April 30, 2025 To enable the District to make critical repairs and upgrades, property owners in Zones 2, 4, and 9 will have the chance to vote on the proposed benefit assessments. The money […] Read All Notices Benefit Assessment Investing in Community Safety In spring 2025, property owners in Zones 2, 4, and 9 had the chance to vote on a benefit assessment increase to enable the District to make critical repairs and upgrades. Benefit Assessment Vote Alameda County Flood Control & Water Conservation District 399 Elmhurst Street
 Hayward, CA 94544-1395 Phone: (510) 670.5480 Email: [email protected] In case of emergency, dial 9-1-1 About The District plans, designs, constructs, and maintains Western Alameda County’s flood control systems such as natural creeks, channels, levees, pump stations, dams, and reservoirs. We also care for the natural environment through public outreach and enforcement of pollution control regulations governing our waterways. © 2026 Alameda County Flood Control & Water Conservation District Copyright Privacy Terms Accessibility ◈ Interior Pages — 10 pages crawledDoing Business with the District - Alameda County Flood Control & Water Conservation District Skip to main content Who We Are The Work We Do Resources Notices Search for: Doing Business with the District Home > Who We Are > Our Partners > Doing Business with the District Consultant Database Sign-Up The District maintains a large database of consultants interested in providing consulting services for engineering, environmental, land surveying, and construction project management for the District, maintained through the Alameda County Public Works Agency. Consultants can receive notifications about new business opportunities by signing up. Sign Up for the Database Small, Local and Emerging Business (SLEB) Program Alameda County’s Small, Local and Emerging Business (SLEB) Program is designed to foster diversity and inclusiveness by improving contracting and procurement opportunities for small businesses within Alameda County. The District urges contractors and vendors to participate in the County’s SLEB program, either by registering as a SLEB (as applicable), or subcontracting portions of a project to SLEB-certified companies. Current RFPs / RFQs See the current list of requests for proposals (RFPs) or qualifications (RFQs) for both the District and the Alameda County Public Works Agency. Alameda County Flood Control & Water Conservation District 399 Elmhurst Street Hayward, CA 94544-1395 Phone: (510) 670.5480 Email: [email protected] In case of emergency, dial 9-1-1 About The District plans, designs, constructs, and maintains Western Alameda County’s flood control systems such as natural creeks, channels, levees, pump stations, dams, and reservoirs. We also care for the natural environment through public outreach and enforcement of pollution control regulations governing our waterways. © 2026 Alameda County Flood Control & Water Conservation District Copyright Privacy Terms Accessibility Family Flood Plan - Alameda County Flood Control & Water Conservation District Skip to main content Who We Are The Work We Do Resources Notices Search for: Family Flood Plan Home > Resources > Family Flood Plan Be Prepared: Make A Family Flood Plan While flooding is rare in Alameda County, being prepared is your best defense. Use this checklist to build your family’s emergency strategy today. Create Your Communication Plan Ensure every family member has the phone numbers for home, work, school, and a trusted neighbor. Designate an Out-of-State Contact: In local emergencies, long-distance lines are often more reliable than local ones. Pick one person everyone should call to check in. Teach the Basics: Make sure children know how and when to dial 9-1-1. Decide on a Meeting Place Pick a specific location to meet if you are separated. Identify a friend or relative outside your immediate area where you can stay if you need to evacuate. Plan for your pets: Identify pet-friendly hotels or shelters in advance. Pack An Emergency Kit Keep supplies in airtight, waterproof bags in an easy-to-reach spot. Your kit should include: Essentials: Cash, essential medicines, extra eyeglasses, and a 3-day supply of food/water. Tools: A hand-crank or battery-powered radio, flashlights, extra batteries, and a whistle. Tech: A cell phone and portable charger. Documents: Physical copies of important records (IDs, insurance, deeds) stored in a waterproof sleeve. Stay Safe During a Flood Listen for Updates: Tune to KCBS (740 AM) for emergency instructions. Stay High: If trapped in your home, move to the highest floor. Do not climb into a closed attic; you may become trapped by rising water. Turn Around, Don't Drown: Never walk, swim, or drive through floodwaters. Just 6 inches of moving water can knock you down, and 12 inches can sweep a vehicle away. Additional Resources Alameda County Family Emergency Plan: View detailed emergency preparedness guides from the County . Learn About Flood Insurance and Safety: Visit FloodSmart.gov for information on coverage, risk, and how to reduce flood damage. Recover After a Flood: See step-by-step guidance on how to start a flood insurance claim . San Lorenzo Creek surges with floodwaters during a severe winter storm, January 2022. Alameda County Flood Control & Water Conservation District 399 Elmhurst Street Hayward, CA 94544-1395 Phone: (510) 670.5480 Email: [email protected] In case of emergency, dial 9-1-1 About The District plans, designs, constructs, and maintains Western Alameda County’s flood control systems such as natural creeks, channels, levees, pump stations, dams, and reservoirs. We also care for the natural environment through public outreach and enforcement of pollution control regulations governing our waterways. © 2026 Alameda County Flood Control & Water Conservation District Copyright Privacy Terms Accessibility Notices - Alameda County Flood Control & Water Conservation District Skip to main content Who We Are The Work We Do Resources Notices Search for: All Notices Home > Notices Revenue Enhancement: Investing in Community Resilience Notices of Public Hearing on Proposed Benefit Assessment Increase in Zones 2, 4, and 9 Posted April 30, 2025 To enable the District to make critical repairs and upgrades, property owners in Zones 2, 4, and 9 will have the chance to vote on the proposed benefit assessments . The money from the benefit assessment increase will fund a carefully selected list of critical flood control projects and can only be used for critical projects identified in that zone. On June 17, 2025 at 9:30 AM, or as soon thereafter as the matter can be heard, the District Board of Supervisors will hold a Public Hearing on the proposed benefit assessment increases at the Alameda County Board of Supervisors Chambers, 1221 Oak Street, Room 512, 5th Floor, Oakland, CA 94612 and, at that time, receive public testimony, hear protests, and direct the tabulation of assessment ballots. Ballots must be submitted prior to the close of the public hearing in order to be tabulated. Presentations to the Community on the Proposed Benefit Assessment Increase in Zones 2, 4, and 9 Posted October 23, 2024 The presentations to the Municipal Advisory Councils and the committees of the Alameda County Board of Supervisors covered the need for additional funding, recent polling, and next steps for the benefit assessment. San Leandro Creek Tree Management Posted June 18, 2024 Updated October 3, 2024 Alameda County Flood Control and Water Conservation District (District) has completed an updated tree assessment along San Leandro Creek between Huff Avenue and I-580 Freeway. This assessment, conducted on District property, evaluated the overall health of the trees and their potential for failure. It also identified necessary treatments, including pruning or removal where required. Surveys were conducted to determine which trees are on District property or easement. The District has no jurisdiction over trees on private properties. Tree management work will be conducted in November 2024. To minimize environmental impacts, the Project will utilize a helicopter to transport tree trunks and branches from the creek channel to designated land areas, where they will then be hauled away for disposal. If you have any questions about this project, please contact Paul Knobel at (510) 670-5775 or e-mail [email protected] . Estudillo Canal and Neptune Drive Flood Protection Project Initial Public Notice Posted May 15, 2023 The U.S. Department of Homeland Security’s Federal Emergency Management Agency (FEMA) intends to provide federal financial assistance under the Hazard Mitigation Grant Program to the Alameda County Flood Control and Water Conservation District in Alameda County, California to modify the Estudillo Canal by making improvements to the tidegate, lowering a portion of the canal, and creating a berm and floodwall along Neptune Drive. The proposed action would mitigate impacts from flooding by increasing flow capacity and redirecting flow in the Estudillo Canal, thus increasing shoreline protection at Neptune Drive to prevent coastal flooding from entering the project area. Pursuant to Executive Order 11988 (Floodplain Management) and Executive Order 11990 (Wetlands Management) and FEMA’s implementing regulations at Title 44 of the Code of Federal Regulations Part 9, FEMA hereby provides interested parties with a notice of its intent to carry out an action affecting a floodplain and wetland. The purpose of the proposed action is to reduce flood hazards. The proposed action consists of improvements to the Estudillo Canal, including expanding the capacity of the existing tidegate to allow for greater discharge flows, lowering a section of the southern canal bank to allow for temporary water storage in existing holding basins (“retention ponds”), and salt marsh modifications. The proposed action also involves shoreline flood protection components along Neptune Drive, primarily the construction of a berm and floodwall. The project area is in the 100-year floodplain as depicted on the FEMA Flood Insurance Rate Map (FIRM) Numbers 06001C0258H and 06001C0254H, both with effective date December 21, 2018. The FIRM shows that the Estudillo Canal project area, in Panel 06001C0258H, lies within Special Flood Hazard Area (SFHA) Zone AE, an area that has a 1-percent probability of flooding every year and where predicted base floodwater elevations (BFEs) are ten feet. The Neptune Drive project area, in Panel 06001C0254H, is also in SFHA Zone AE, with a 1-percent probability of flooding every year and with a BFE of ten feet. The U.S. Fish and Wildlife Service National Wetlands Inventory map shows five wetlands within the project boundaries and adjacent areas. The Neptune Drive project area is directly adjacent to a 210.33-acre estuarine and marine wetland. The Estudillo Canal project area overlaps with the edge of 261,265.24 acres of estuarine and marine deepwater and 2.41 acres of estuarine and marine wetland and is adjacent to a 15.11-acre lake habitat. Additional information about FEMA’s proposed action, including maps showing the potential impacts on floodplains and wetlands, may be obtained by writing the FEMA Region IX Environmental Officer at FEMA, 1111 Broadway, Suite 1200, Oakland, California 94607, or [email protected] . All requests should be received within 15 days after publication of this notice. Final Public Notice Posted June 29, 2023 The U.S. Department of Homeland Security’s Federal Emergency Management Agency (FEMA) intends to provide federal financial assistance under the Hazard Mitigation Grant Program to the Alameda County Flood Control and Water Conservation District in Alameda County, California to modify the Estudillo Canal by making improvements to the tidegate, lowering a portion of the canal, and creating a berm and floodwall along Neptune Drive. The proposed action would mitigate impacts from flooding by increasing flow capacity and redirecting flow in the Estudillo Canal, thus increasing shoreline protection at Neptune Drive to prevent coastal flooding from entering the project area. Pursuant to Executive Order 11988 (Floodplain Management) and Executive Order 11990 (Wetlands Management) and FEMA’s implementing regulations at Title 44 of the Code of Federal Regulations Part 9, FEMA hereby provides interested parties with a notice of its final decision and an explanation of the alternatives that were considered. The purpose of the proposed action is to reduce flood hazards. The proposed action consists of improvements to the Estudillo Canal, including expanding the capacity of the existing tidegate to allow for greater discharge flows, lowering a section of the southern canal bank to allow for temporary water storage in existing holding basins (“retention ponds”), and salt marsh modifications. The proposed action also involves shoreline flood protection components along Neptune Drive, including the construction of a berm and floodwall. The project area is in the 100-year floodplain as depicted on the FEMA Flood Insurance Rate Map (FIRM) Numbers 06001C0258H and 06001C0254H, both with an effective date of December 21, 2018. The FIRM shows that the Estudillo Canal project area, in Panel 06001C0258H, lies within Special Flood Hazard Area (SFHA) Zone AE, an area that has a 1- percent probability of flooding every year and where predicted base floodwater elevations (BFEs) are 10 feet. The Neptune Drive project area, in Panel 06001C0254H, is also in SFHA Zone AE with a 1-percent probability of flooding every year and a BFE of 10 feet. The U.S. Fish and Wildlife Service National Wetlands Inventory map shows five wetlands within the project boundaries and adjacent areas. The Neptune Drive project area is directly adjacent to a 210.33-acre estuarine and Annual Reports - Alameda County Flood Control & Water Conservation District Skip to main content Who We Are The Work We Do Resources Notices Search for: Annual Reports Home > Resources > Annual Reports Explore the District’s collection of annual reports, which document ongoing flood control projects, watershed planning, and long-term infrastructure efforts across Western Alameda County as well as an overview of the District’s finances. 2024-2025 Annual Report Download the 2024-2025 Report 2023-2024 Annual Report Download the 2023-2024 Report 2022-2023 Annual Report Download the 2022-2023 Report 2019-2020 Annual Report Download the 2019-2020 Report 2017-2018 Annual Report Download the 2017-2018 Report 2016 Annual Report Microsite Visit the 2016 Report Microsite 2014-2015 Report to the Community Download the 2014-2015 Report 2012-2013 Report to the Community Download the 2012-2013 Report 2011-2012 Report to the Community Download the 2011-2012 Report 2010 Report to the Community Download the 2010 Report Alameda County Flood Control & Water Conservation District 399 Elmhurst Street Hayward, CA 94544-1395 Phone: (510) 670.5480 Email: [email protected] In case of emergency, dial 9-1-1 About The District plans, designs, constructs, and maintains Western Alameda County’s flood control systems such as natural creeks, channels, levees, pump stations, dams, and reservoirs. We also care for the natural environment through public outreach and enforcement of pollution control regulations governing our waterways. © 2026 Alameda County Flood Control & Water Conservation District Copyright Privacy Terms Accessibility Accessibility - Alameda County Flood Control & Water Conservation District Skip to main content Who We Are The Work We Do Resources Notices Search for: Accessibility The Alameda County Flood Control & Water Conservation District (District) is committed to making this website accessible to individuals with disabilities. We have made a sincere effort to comply with the requirements of Section 508 of the Rehabilitation Act. If you use assistive technology (such as a Braille reader, screen reader, TTY) and the format of material on this District website interferes with your ability to access the information, please contact us for assistance. In your correspondence, please indicate the nature of your accessibility problem, the preferred format in which to receive the material, the web address (URL) of the requested material, and your contact information. Alameda County Flood Control & Water Conservation District 399 Elmhurst Street Hayward, CA 94544-1395 Phone: (510) 670.5480 Email: [email protected] In case of emergency, dial 9-1-1 About The District plans, designs, constructs, and maintains Western Alameda County’s flood control systems such as natural creeks, channels, levees, pump stations, dams, and reservoirs. We also care for the natural environment through public outreach and enforcement of pollution control regulations governing our waterways. © 2026 Alameda County Flood Control & Water Conservation District Copyright Privacy Terms Accessibility Explore Watersheds - Alameda County Flood Control & Water Conservation District Skip to main content Who We Are The Work We Do Resources Notices Search for: Explore Watersheds Home > Resources > Explore Watersheds Interactive Map: Alameda County Watersheds Alameda County is made up of many interconnected watersheds that cross city boundaries and natural landscapes. These watersheds shape how rain and runoff move through creeks, channels, and neighborhoods before reaching the Bay. Explore the watersheds to learn how water flows through your community, where creeks connect, and how local restoration and stewardship efforts are helping protect these vital systems. Alameda County Watersheds on Google Earth If you are interested in downloading these interactive watershed map files via Google Earth (KMZ files), you must have Google Earth Pro downloaded to your computer or electronic device. Using Google Earth Pro, you can download either of the following watershed maps: Map of the Western Alameda County Watershed Map of the Eastern Alameda Creek Watershed Watershed Details Agua Fria Creek Watershed Size 8 square miles Flow A group of small streams flowing from the western face of Mission Peak, joining and discharging into Coyote Creek in south San Francisco Bay Includes Agua Fria Creek, Toroges Creek, Scott Creek, and engineered channel Lines A, B, C, and D, which artificially link the creeks together near the bay. Open Channel 18.6 miles Learn more about this watershed Lower Alameda Creek Watershed Size Including Alameda County and eastern Santa Clara County, this watershed is 660 square miles in area, the largest watershed on the eastern shore of the San Francisco Bay. Only 30 square miles, or 5% of the watershed, are located in western Alameda County. Flow Alameda Creek heads in the rugged hills of the Diablo Range, draining from as far south as Mount Hamilton and as far east as Altamont Pass. Major tributaries join Alameda Creek in Sunol Valley. The creek then cuts through Niles Canyon and flows across the East Bay plain to the eastern shore of San Francisco Bay. Includes Major tributaries in western Alameda County are Dry Creek, Crandall Creek, and Lines J-2 and J-3. These flow into the Alameda Creek Flood Control Channel, an 11-mile-long channel built in the early 1970s replacing the natural creek. Cities Fremont, Newark Learn more about this watershed Upper Alameda Creek Watershed Subwatershed of Alameda Creek Watershed Size 74 square miles Flow The Upper Alameda Creek watershed is a subwatershed of the 661 square-mile Alameda Creek watershed, the largest watershed draining to the eastern shore of the San Francisco Bay. Includes Alameda Creek starts in the rugged hills of the Diablo Range and flows northwest through broad Sunol Valley, then turns west to run through steep Niles Canyon. Arbitrarily designated, \"Upper\" Alameda Creek becomes \"Lower\" Alameda Creek about midway through the canyon. Cities Alameda Creek east of Stonybrook Creek, Stonybrook Creek, Sheridan Creek, Pirate Creek, Welch Creek, Leyden Creek, Indian Joe Creek, Whitlock Creek, Valpe Creek. Learn more about this watershed Alamo Canal Watershed Subwatershed of Alameda Creek Watershed Size 44 square miles Flow Alamo Canal drains northern Amador Valley and a portion of the hills south of Mount Diablo. The Alamo Canal ends at its junction with Arroyo Mocho, where both flow into Arroyo de la Laguna, which eventually flows into Alameda Creek. Includes Alamo Canal, Alamo Creek, West Branch Alamo Creek, South San Ramon Creek, Coyote Creek, Norris Creek, Oak Creek, Big Canyon Creek, Martin Canyon Creek, Dublin Creek, Gold Creek, and Tehan Canyon. Cities San Ramon, Dublin, Pleasanton Open Channel 75 miles Learn more about this watershed Arroyo Hondo Watershed Subwatershed of Alameda Creek Watershed Size 99 square miles Flow Heads in the rugged mountains of the Diablo Range near Mount Hamilton, and flows north into Calaveras Reservoir. Includes Arroyo Hondo, Calaveras Creek, Isabel Creek, Long Branch, Hog Slough, Smith Creek, Sulphur Creek Cities none Open Channel 216 miles Learn more about this watershed Arroyo de la Laguna Watershed Subwatershed of Alameda Creek Watershed Size 29 square miles Flow The Arroyo de la Laguna watershed drains flatlands and hills of the southern Amador Valley, and transmits flow from six other subwatersheds including Alamo Canal, Arroyo Mocho, Arroyo Mocho Canal, Arroyo Las Positas, and Arroyo del Valle. Arroyo de la Laguna then flows south to Sunol Valley, where it joins Alameda Creek. Includes Arroyo de la Laguna, Sinbad Creek, Pleasanton Canal, Kottinger Creek, Mission Creek, Sycamore Creek, Happy Valley Creek, Sheep Camp Creek, and Vallecitos Creek Cities Pleasanton, Sunol Open Channel 61 miles Learn more about this watershed Arroyo Mocho Watershed Subwatershed of Alameda Creek Watershed Size 54 square miles Flow Drains a narrow rugged canyon that extends approximately 20 miles southeast of Livermore, to its headwaters in northern Santa Clara County. Includes Arroyo Mocho, Tunnel Creek, Mendenhall Springs Cities Livermore Open Channel 114 miles Learn more about this watershed Arroyo Las Positas Watershed Subwatershed of Alameda Creek Watershed Size 81 square miles Flow Drains the Altamont Pass Includes Arroyo Las Positas, Altamont Creek, Arroyo Seco, Cayetano Creek, Collier Canyon Creek, Cottonwood Creek, Frick Lake Cities Livermore Open Channel 152 miles Learn more about this watershed Arroyo del Valle Watershed Subwatershed of Alameda Creek Watershed Size 168 square miles Flow Arroyo del Valle heads in the rugged mountains of the Diablo Range and flows northwest toward Livermore Valley. Before reaching the valley, it is impounded to create Lake Del Valle. Once released at the dam, the creek flows along the south side of the valley to join Arroyo de la Laguna in Pleasanton. Includes Arroyo del Valle (also known as Arroyo Valle), Dry Creek, Shafer Creek, Trout Creek, Sycamore Creek, Colorado Creek, Arroyo Bayo, San Antonio Creek, Jumpoff Creek, Sulphur Springs Creek, Sweetwater Creek, Beauregard Creek, Lake Del Valle. Cities Livermore, Pleasanton Open Channel 383 miles Learn more about this watershed Arroyo Viejo Watershed Size 6.23 square miles Flow From the hills west of Skyline Boulevard in Oakland, to Damon Slough and San Leandro Bay Includes Rifle Range Branch, Melrose Highlands Branch, County Club Branch, and 73rd Ave Branch Open Channel 7.8 miles Learn more about this watershed Bay Farm Island Watershed Size 2.8 square miles Flow Drains into Airport Channel, San Leandro Bay and surrounding San Francisco Bay or Oakland Estuary. Includes Bay Farm Island and the Oakland airport Cities Alameda, Oakland Open Channel 2.1 miles, consisting of engineered channels in artificial fill over the former tidal marsh. Learn more about this watershed Bockman Canal Watershed Size 2.78 square miles Flow From the flatlands of western San Leandro to San Francisco Bay Includes A network of storm drains and canals Open Channel 1.7 miles, no natural creeks Learn more about this watershed Chain of Lakes Watershed Learn more about this watershed Codornices Creek Watershed Size 2.9 square miles Flow Starts in the Berkeley hills along Grizzly Peak Boulevard and flows across north Berkeley and Albany to San Francisco Bay south of Albany Hill Includes Village Creek (Lower Marin Creek), Upper Marin Creek, and Blackberry Creek Open Channel 4.6 miles Learn more about this watershed Crandall Creek Subwatershed Part of the Alameda Creek Watershed Size 6.5 square miles Flow From urban flatlands of Fremont into the Coyote Hills marsh, where the water is cleaned naturally, then through a pipe under the levee into the Alameda Creek Flood Control Channel. Includes Crandall Creek and Ardenwood Creek (now engineered channels) and a network of underground storm drains. Cities Fremont Open Channel 6.4 miles Learn more about this watershed Cerrito Creek Watershed Size 3.1 square m Resources - Alameda County Flood Control & Water Conservation District Skip to main content Who We Are The Work We Do Resources Notices Search for: Resources Home > Resources Explore tools, guidance, and publications related to flood protection, creeks, watersheds, and District programs in Alameda County. These resources support residents, property owners, contractors, and anyone interested in learning more about local waterways. Ordinances, Resources, and Regulations Local rules and permitting requirements help protect creeks, manage flooding, and guide safe construction near waterways. Learn about ordinances, regulations, and best practices for maintaining land and working near creeks in Alameda County. Guidance for Creekside Properties Explore Watersheds Watersheds shape how rain and runoff move through creeks, channels, and neighborhoods. Explore interactive maps and data files to see how water flows in your area and across Alameda County. Explore Watersheds Hydrology & Hydraulics Manual The District’s Hydrology & Hydraulics Manual establishes technical standards for analyzing flood flows and designing flood control facilities. Access the current updated manual, calculation tools, and supporting data. Read the Manual Annual Reports The District publishes annual reports that document flood protection projects, planning efforts, and long-term strategies. Browse the reports to learn more about how we manage risk and invest in resilience. View the Annual Reports Family Flood Plan Preparing in advance helps families respond safely during emergencies and recover more quickly afterward. Find tips on how to create a simple plan for what to do before, during, and after a flood. Learn About Family Flood Plans Scenic Adventures The District partners with the East Bay Regional Park District, cities, and community groups to manage parks, lakes, and trails. Discover District-owned properties open to the public for recreation and learning. View the Scenic Adventures Alameda County Flood Control & Water Conservation District 399 Elmhurst Street Hayward, CA 94544-1395 Phone: (510) 670.5480 Email: [email protected] In case of emergency, dial 9-1-1 About The District plans, designs, constructs, and maintains Western Alameda County’s flood control systems such as natural creeks, channels, levees, pump stations, dams, and reservoirs. We also care for the natural environment through public outreach and enforcement of pollution control regulations governing our waterways. © 2026 Alameda County Flood Control & Water Conservation District Copyright Privacy Terms Accessibility Copyright - Alameda County Flood Control & Water Conservation District Skip to main content Who We Are The Work We Do Resources Notices Search for: Copyright and Terms Use of Website Content Use of text, images, or other content found on this website is subject to the following terms and conditions: Content Is Protected by Intellectual Property Laws Text and image files, audio and video clips, and other content on this website are the property of the Alameda County Flood Control & Water Conservation District (District) or the Alameda County Public Works Agency (ACPWA). Copyrights and other proprietary rights for content of this website may also be owned by individuals and entities other than, and/or in addition to, the District and ACPWA. 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Anyone wishing to use any of these files or images for commercial use, publication, or any purpose other than fair use as defined by law must request and receive prior written permission from the District. Permission for such use is granted on a case-by-case basis at the sole discretion of the District. A usage fee may be assessed, depending on the type and nature of the proposed use. For District content usage, contact [email protected]. Disclaimer The text, images, and content on the website are provided “as is” without a warranty of any kind, either expressed or implied. The District assumes no responsibility and shall not be liable for any damage to or viruses that may affect users’ computer equipment or other property on account of their use of the site or their downloading of any text, images, or content from the website. Links to Third-Party Websites ACfloodcontrol.org contains links to third-party websites. The linked sites are not under the control of the District, ACPWA, or ACfloodcontrol.org. The District, ACPWA, and ACfloodcontrol.org are not responsible for the contents of any linked website. These links are provided as a convenience only and shall not be construed as an endorsement of, sponsorship of, or affiliated with the linked website by the District or ACPWA. ACfloodcontrol.org may change this policy from time to time and reserves the right to do so without notice. Alameda County Flood Control & Water Conservation District 399 Elmhurst Street Hayward, CA 94544-1395 Phone: (510) 670.5480 Email: [email protected] In case of emergency, dial 9-1-1 About The District plans, designs, constructs, and maintains Western Alameda County’s flood control systems such as natural creeks, channels, levees, pump stations, dams, and reservoirs. We also care for the natural environment through public outreach and enforcement of pollution control regulations governing our waterways. © 2026 Alameda County Flood Control & Water Conservation District Copyright Privacy Terms Accessibility Hydrology & Hydraulics Manual - Alameda County Flood Control & Water Conservation District Skip to main content Who We Are The Work We Do Resources Notices Search for: Hydrology & Hydraulics Manual Home > Resources > Hydrology & Hydraulics Manual Alameda County Flood Control & Water Conservation District’s updated Alameda County Hydrology & Hydraulics Manual defines current practice in the hydrologic and hydraulic design of all flood control facilities in Alameda County that are subject to District approval. The guidelines and hydrologic computation techniques in the manual are applicable for hydrologic and hydraulic studies and design beginning January 1994 for the District’s large open-channel projects, and for all projects effective October 2016. 2026 Hydrology & Hydraulics Manual (PDF - 23.6MB) Calculation Form: District Rational (Excel - 70KB) GIS Database Files (ZIP - 3.9GB) To receive notifications of manual or data file updates, please provide your contact information. First Name * Last Name * Email * Submit Alameda County Flood Control & Water Conservation District 399 Elmhurst Street Hayward, CA 94544-1395 Phone: (510) 670.5480 Email: [email protected] In case of emergency, dial 9-1-1 About The District plans, designs, constructs, and maintains Western Alameda County’s flood control systems such as natural creeks, channels, levees, pump stations, dams, and reservoirs. We also care for the natural environment through public outreach and enforcement of pollution control regulations governing our waterways. © 2026 Alameda County Flood Control & Water Conservation District Copyright Privacy Terms Accessibility Projects in Your Area - Alameda County Flood Control & Water Conservation District Skip to main content Who We Are The Work We Do Resources Notices Search for: Projects in Your Area Home > The Work We Do > Projects in Your Area Learn About Projects in Your Neighborhood Flood control and water conservation efforts vary across the Western Alameda County, shaped by differences in geography, drainage patterns, and community needs. To support effective planning and delivery of flood protection, Western Alameda County is divided into zones that generally follow major watershed boundaries. Revenue collected in each zone can only be spent within that zone and only on District-owned property or other property that the District has a legal right to access. The District has no authority to maintain, repair, or remove infrastructure or vegetation beyond its designated properties. Learn more about how District projects are funded. Click on the map or select your zone from the list below to learn more about flood control and water conservation projects in your neighborhood. Zone 2 Zone 2A Zone 3A Zone 4 Zone 5 Zone 6 Zone 9 Zone 12 Zone 13 Learn how projects move from early planning to construction by reading our Project Steps page . For a broader view of the District work across all zones over time, read the District’s Annual Reports . Projects in construction are listed on the Alameda County Public Works Agency website where you can find detailed information about recent activities. Zones Served by the District The District serves Zones 2, 2A, 3A, 4, 5, 6, 9, 12, and 13, which are included on this website. Zone 7, which includes Livermore, Pleasanton, Dublin and nearby unincorporated areas (including Sunol) in eastern Alameda County, is served by the Zone 7 Water Agency . Over time, other designated zones (1, 3, 8, 10, and 11) have been consolidated or discontinued as participating jurisdictions and planning boundaries have evolved. Alameda County Flood Control & Water Conservation District 399 Elmhurst Street Hayward, CA 94544-1395 Phone: (510) 670.5480 Email: [email protected] In case of emergency, dial 9-1-1 About The District plans, designs, constructs, and maintains Western Alameda County’s flood control systems such as natural creeks, channels, levees, pump stations, dams, and reservoirs. We also care for the natural environment through public outreach and enforcement of pollution control regulations governing our waterways. © 2026 Alameda County Flood Control & Water Conservation District Copyright Privacy Terms Accessibility