To protect both upper and lower Mainstem project communities, Seven Oaks Dam, a 550-foot-high and 2,980-foot long rockfill dam with a gross capacity of 147,970 acre feet, has been constructed in the upper Santa Ana Canyon. The dam will reduce the Reservoir Design Flood inflow of 85,000 CFS, to a...
The 1986 Orange County Hydrology Manual and its 1996 Addendum have been calibrated to local watershed conditions. They provide guidance in estimating peak discharges and volumes of storm water runoff for the design of flood control facilities and floodplain determination. The primary goal is to provide 100-year flood protection for...
Safety & Education Introduction Brochures BE FLOOD READY! Flood Safety & Awareness Visit the Be Flood Ready! web page . Download a PDF of the Be Flood Ready! brochure. STAY OUT! STAY ALIVE! Flood Channel, River, and Creek Safety Awareness Download a PDF of the Stay Out! Stay Alive! brochure...
Geotechnical Design Report Revised Aerially Deposited Lead Report Material Report Aerial Deposited Lead Report
Core Services One of the County’s primary objectives is to provide our community with a safe and efficient unincorporated roadway system through the planning, design, construction and maintenance of road infrastructure, traffic safety and signal operations, annual road maintenance and related services. Public Work’s roadway responsibilities include: Securing funding to...
When the SARI Line was completed in the mid-1970s, the pipeline was buried with as much as 20 feet of soil cover in some locations. Over the years, the riverbed has eroded and now provides only 1-foot or less of protective soil covering over portions of the upper reaches of...
The City Engineers Flood Control Advisory Committee (CEFCAC) was formed in August 1966 to provide cooperation between the Orange County Flood Control District (OCFCD) and the cities toward the best deployment of money and manpower to accomplish conservation of water and protection of existing public and private property from floods...
The County of Orange has six active OC Road Fee Programs. Each OC Road Fee Program has a specific Area of Benefit (AOB) that determines if an OC road fee is associated with the building permit application. Each OC Road Fee Program also has its own fee schedule which imposes...
In this section you will find several informational resources including online maps, drawings, reports, manuals, and links to County Standard Plans and other government resources. Standard Plans & Specifications Find links to County, other governmental and non-governmental Standard Plans & Specifications. Drawings The Flood Drawing Index is an online link...
The East Garden Grove-Wintersburg Channel Improvement Project was officially completed in March 2023. Read and download the Notice of Project Completion . Watch the before and after drone video footage filmed by OC Survey!