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Orange County Flood
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- Flood
Protection Information
Local Flood Hazard,
Flood Safety,
Flood Insurance,
Property Protection Measures,
Natural/Beneficial Functions,
Environmental Engineering,
Map of Local Flood Hazard,
Alert System,
Floodplain Development Permit Requirements,
Substantial Improvement/Damage Requirements,
Drainage System Maintenance,
Protecting Our Waterways,
Floodplain Information & Elevation Certificates,
River Gauge Data (real time),
Flood Warning Information
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Peter Canyon Wash Mitigation Project
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OC Flood Organization Chart
The OC Flood consists of three levels:
Flood Control Programs,
Flood Control Design , and Santa Ana
River Project.

Flood Control Programs
The Flood Control Programs section is comprised of four sub-sections whose primary
function is managing the County's floodplains. This section provides development
support to developers and other agencies and manages the Flood Control Capital Improvement
Program.
Advance Planning
- Prepares regional facilities studies and reports identifying system deficiencies
and problems on OCFCD facilities and recommends solutions to provide 100-year channel
capacity
- Reviews conceptual proposals including hydrology and hydraulic calculations for
related regional flood control facilities
- Acts as liaison and monitors and coordinates federal interest projects within OCFCD
facilities
- Provides support in implementing water quality features within OCFCD's facilities
that are required for participants in the County’s NPDES Program
- Prepares cooperative agreements with private and public interests on special projects
- Performs County Property Permit reviews on permits affecting OCFCD facilities
- Negotiates A-E contract agreements with consultants for professional/engineering
services and manages contracts
- Provides project management services on special projects
- Provides drainage and flood control information to other County departments for
purposes of NPDES permits, annexations, incorporations, etc.
Programming
- Provides staff support to the City Engineers Flood Control Advisory Committee (CEFCAC)
in identifying project priorities
- Provides floodplain information to residents in unincorporated Orange County
- Prepares preliminary engineering studies and cost estimates
- Prepares applications for grant funds and cooperative funding agreements
- Prepares flood control programs for the upcoming fiscal years and the multi year
plan
- Monitors FEMA regulations and help administer and manage the County's floodplain
program
- Submits Letters of Map Revision submittals to FEMA for floodplain boundary changes
resulting from OCFCD's public works projects in the unincorporated regions of Orange
County
- Reviews legislation, site plans, permit applications, use permits, environmental
documentation, city originated proposals, proposed annexations, etc. for impacts
to flood control facilities or floodplains
- Maintains Architect-Engineer (A-E) database for agency use in hiring A-Es
Development Support
- Prepares regional facilities studies and reports identifying system deficiencies
and problems and recommend solutions to provide 100-year channel capacity
- Acts as liaison with project proponent and monitors projects
- Reviews Specific Plans, Feature Plans, Environmental Impact Report's (EIR) and engineering
studies
- Prepares cooperative agreements with, private and public interests; Coordinate multi-agency
projects with other divisions and entities
Hydrology
- Maintains hydrologic data for OCFCD facilities
- Establishes design discharges for regional flood control channels through the preparation
of hydrology reports
- Coordinates, reviews, and approves hydrology studies and runoff management plans
for regional flood control facilities prepared by private developers
- Provides assistance on interpretation of criteria of the Orange County Hydrology
Manual and its Addendum
- Provides hydrologic review and support to other OC Public Works divisions, public
agencies, and consultants who use the Orange County Hydrology Manual
- Negotiates A-E contracts for hydrology studies and reports and administers contracts
when executed
- Reviews CEQA documents received from OC Public Works or non-County lead submittals
for impacts to regional hydrology and OCFCD facilities

Flood Control Design
The goals of the Flood Control Design section align with the overall goals of OC
Public Works, and more specifically to the OC Flood’s goals. The Design section
is responsible for design and analysis of flood control capital improvement projects.
Facilities that are typically included in this effort are: flood control channels,
creeks, rivers, dams, retarding basins, pump stations, storm drains and other flood
control infrastructure.
Design engineers are now being challenged to include multiple objectives for flood
control facilities. As an example, creative water quality enhancements are now considered
within each capital project, when feasible. The design of such flood control facilities
has also become increasingly challenging, as the regulatory environment continues
to redefine its approaches to permitting projects. Design staff work closely with
the OC Public Works Regulatory Permits section to ensure proper consideration of
issues that are of concern to the environmental regulators.
To ensure timely completion of projects within a defined budget, Design staff also
work closely with the Project Management sub-section of the OC Public Works Construction
Section who are charged with project managing higher priority projects. There are
two major flood control pump stations and one channel system that are currently
being project managed. As this sub-section gets further developed and staffed, other
projects will be added to their responsibilities.
The Design section also serves a secondary function to support development within
Orange County . This involvement includes reviewing/approving hydrology/hydraulic
submittals, concept studies, permit applications, master plans, runoff management
plans, reports, environmental documents for hydrologic/hydraulic and other flood
control related policy issues.
Finally, this section has and continues to develop technical flood control expertise.
This expertise is often shared with the local engineering community through staff-presented
technical seminars and other presentations. This involvement in the profession has
gained the County a very highly respectable position in the engineering community.
Santa Ana River Project Section (SARP)
The Santa Ana River Mainstem Project is the largest public works project undertaken
by Orange County government. In recognition of the scope and management complexities
of the Mainstem Project, the Orange County Board of Supervisors in 1989 authorized
the establishment of a project management section (the SARP) whose responsibilities
include planning support, engineering, real estate, legal, and administration services.
SARP staff represent and coordinate work among all responsible organization elements
within Orange County, the Corps, and the other Local Sponsor organizations. For
purposes of efficiency, the SARP section is comprised of two sub-sections: Real
Estate/ Finance/Engineering and Cooperative Projects.
Real Estate/Finance/Engineering
Real Estate/Finance
- Program Management for SAR/Prado Dam Project real property acquisition (about 380
ownerships)
- Prepare annual budget requests and long range financial plans
- Coordinate audits with State and Federal agencies
- Monitor and report on project schedules/status, and expenditures
- Coordinate with Local, State, Federal agencies on land use, water rights, water
conservation, and related issues impacting OCFCD property along SAR Mainstem
Engineering
Seven Oaks Dam
- Act as Reservoir Regulation Team at Seven Oaks Dam in San Bernardino County for
water control operations.
- Coordinate maintenance at Seven Oaks Dam.
- Provide water control training and practices for backup Reservoir Regulation Team
and Dam Tenders in San Bernardino and Orange County.
- Coordinate and participate in annual inspection and repairs of the Dam
- Coordinate preparation of reports to address environmental impacts from the Seven
Oaks Dam.
- Coordinate with U.S. Army Corps of Engineers (Corps) in the development and implementation
of a Multi Species Habitat Management Plan (MSHMP) for the operation of Seven Oaks
Dam to ensure the continued survival of endangered species, such as the Woolly-star
plant and the San Bernardino Kangaroo Rat.
Prado Basin - Prado Dam
- Coordinate with Corps and affected cities on the design of several earthen dikes
in conjunction with the raising of Prado Dam.
- Coordinate with Corps and utility owners to identify and remediate utilities that
interfere with the Main Stem Project.
Cooperative Projects
Santa Ana River
- Coordinate between Corps, OC Public Works, and other public agencies regarding the
planning, design and construction of SAR Mainstem Project features.
- Protection and/or relocation of utilities affected by the SAR Mainstem Project,
including the Santa Ana River Interceptor (SARI) Line.
- Review and comment on encroachment and other permits affecting the Santa Ana River.
- Coordination with the Corps on landscape improvement projects along the Santa Ana
River.
- Coordinate Reach 1 & 2 dredging and vegetation removal and obtaining necessary permits
with regulatory agencies.
- Complete the Habitat Management Plan (HMP) for the Santa Ana River Canyon (Reach
9) area, and implement the HMP via the establishment of a conservation monitoring
committee that will hold regular meetings to address issues relating to ongoing
O&M and recreation-related activities in the canyon, the HMP is being updated to
include additional species that were listed as Endangered or threatened since the
last update.
- Obtain required environmental permits/clearances from resource agencies such as
the U.S. Fish and Wildlife Service and the California Department of Fish & Game,
to construct flood control improvements and perform operations and maintenance (O&M)
activities in the Santa Ana River.
Watershed Studies
- Coordinate with the Corps of Engineers on studies for flood control improvements
for the Westminster – East Garden Grove and San Juan Creek watersheds.
Trail and Class I Bikeway Planning
- Use Proposition 84 funding to complete the Santa Ana River Trail and Class I Bikeway
between Gypsum Canyon Road and the Orange County line.
- Implement trail projects and improvements along flood control facilities.
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OC Flood Popular Links
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External Related Links
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