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Update on Las Posas Estates Drain and N. Ramona Place Drain Letter of Map Revision (LOMR)
APPROVED MAP REVISION
Ventura County Public Works Agency-Watershed Protection (VCPWA-WP) and the City of Camarillo jointly initiated a floodplain Letter of Map Revision (LOMR) process in 2021, which was successfully completed in 2022.
In September 2022 FEMA’s mapping contractors informed the Communities’ Floodplain Administrators that the submitted LOMR application and the corresponding certified topographic workmap and annotated Flood Insurance Rate Maps (FIRMs) were approved.
During the Fall of 2022, affected property owners will receive public notices informing them of the proposed floodplain map revision. FEMA will inform the Communities of the effective date of the pending map revision.
As a result of the approved FEMA floodplain map revision, the current flood zone designation will change from an Approximate Zone A to a Zone X designation on 35 private parcels downstream of the existing detention basins and they will be removed from the Special Flood Hazard Area (SFHA).
FEMA required that the inundation area in the detention basins be shown on the FIRM with the corresponding BFE values. As a result, 9 private parcels upstream of the existing detention basin ponding area will be put in the SFHA and Zone AE designation and Base Flood Elevation (BFE) will be established. However, no structures will be affected by this change.
See the Revised Floodplain Map via the link below:
BACKGROUND
Las Posas Estates Drain and N. Ramona Place Drain are located along Ramona Place between Las Posas Estates Detention Basin and Ramona Detention Basin in the County Unincorporated area and the City of Camarillo. FEMA mapped these drains as an Approximate Zone A on the Flood Insurance Rate Map (FIRM) in the 1980’s. The Las Posas Estates Detention Basin and Ramona Detention Basin were both constructed by the Soil Conservation Service (SCS) in the early 1960’s. The two detention basins were later upgraded by the Watershed Protection (WP) in 1992 to meet the WP’s standards. However, the SFHA designation was not changed.
Based on the detailed floodplain analysis, much of the watershed is regulated by the two detention basins. However, stormwater runoff from un-regulated drainage areas downstream of the two basins will create ponded flood water in low lying areas during a 100-year flood (base flood) event. The ponded flood water will not pose flooding threats to residential structures which are built on higher elevations. Figure 1 below shows the proposed Zone X floodplain downstream of the detention basins replacing the currently effective Approximate Zone A, and proposed Zone AE upstream of the detention basins.
In early 2021, VCPWA-WP hired the local consulting firm of Kasraie Consulting to conduct detailed hydrologic and hydraulic engineering analysis to update the floodplain and flood hazard areas downstream of the two detention basins. Their analysis report was used in support of the LOMR application to FEMA. The LOMR application was initially filed in May 2021, and a revision was submitted in October 2021. FEMA’s mapping contractors conducted a thorough review of the submitted analysis and the flood maps and approved the application in September 2022.
MORE INFORMATION
An electronic version of the complete LOMR application package, commonly referred to as Technical Support Data Notebook (TSDN) may be downloaded via the following link:
or by appointment at the Ventura County Public Works Agency Development and Inspection Services Division at 800 S. Victoria Avenue, Ventura, CA during normal business hours. They may be reached by phone at (805) 654-3027.
Click on link to see the Award Received to Flood Week Resolution for PWA - Watershed Protection
The Federal Emergency Management Agency (FEMA) in collaboration with the County of Ventura and the Faria Beach Homeowners Association (HOA) have been conducting a Letter of Map Revision (LOMR) re-study along the coastal community of Faria Beach, California.
On January 29, 2021, the California Coastal Analysis and Mapping (CCAMP) for the Ventura County Coast floodplain maps, including the Faria Beach, went into effect. See the news item below.
Subsequent to the adoption of CCAMP, Faria Beach HOA filed a Letter of Map Revision application which once adopted will change the effective floodplain boundaries and Base Flood Elevations (BFE) along portions of the Faria Beach coastal community. The Draft Flood Insurance Rate Maps (FIRM) for the affected areas of the Faria Beach may be found through the link below:
Draft Flood Insurance Rate Maps
Specifically, the flood hazard information will be revised along the Pacific Ocean from a point approximately 600 feet east of the intersection of Hobson Road with the Pacific Coast Highway to a point approximately 1,400 feet west of the intersection of A Lease Canyon Road and the Pacific Coast Highway.
As a result of the mapping revisions the coastal Base Flood Elevations listed for mapped VE Special Flood Hazard Areas (SFHA) will decrease two (2) to five (5) feet. Within the area of revision, mapped VE SFHA’s will increase (widen) in some locations and decrease in others. The maximum SFHA increase is approximately 28 feet and the maximum SFHA decrease is approximately 15 feet.
Additionally, maps and detailed analysis of the revision can be reviewed with appointment at:
Ventura County Public Works AgencyDevelopment and Inspection Services800 South Victoria AvenueVentura, CA 93009(805) 654-2423
Interested persons may also call Kasraie Consulting for additional information at (805) 340-4744 during normal business hours.
Progress Update
Santa Clara River Watershed Flood Insurance Re-Study
The Federal Emergency Management Agency (FEMA) in collaboration with Ventura County local communities has been conducting a Flood Insurance Re-Study (FIS) for the Santa Clara River watershed. The study area covers the cities of Ventura, Oxnard, Santa Paula, Fillmore, and the county unincorporated areas. A Preliminary Flood Insurance Rate Map (FIRM) was release on September 26, 2014. In May 2018, a flood risk review meeting was held in Ventura to introduce the preliminary maps and collect comments from local communities. Since the release of the preliminary FIRM, the Ventura County Public Works Agency-Watershed Protection and the cities have worked together to perform technical reviews and submit appeals to FEMA to ensure the flood hazard mapping products are produced using the latest technologies and are based on the best available information. Incorporating the review comments and technical appeals, FEMA has released a Revised Preliminary FIRM on July 31, 2020. Local communities have 30-days to comment on the revised preliminary maps followed by a 90-day appeal period. The appeal period begins on March 11, 2021 and ends June 9, 2021.
FEMA's announcement of the appeal period can be found at:
You can find the Preliminary FIRM at:
