VE Zones and Del Mar Beachfront Homes

For most of Del Mar’s history, the flood maps along the beach were built on older methods. The City’s flood map page says the previous mapping was done roughly three decades before the current one, and that the main difference is the newer maps account for wave action and detailed engineering models of coastal flooding. For a handful of beachfront blocks, that difference matters a great deal, because it changes what FEMA expects to sit beneath a house.

This entry walks through what the record says about the map change, what a VE zone asks of a foundation in general terms, and the questions worth settling before any structural work on a beachfront home. Our page on North Beach floodplain foundations covers the broader neighborhood.

How the map changed

The City’s page lays out the sequence plainly.

• In 2017, FEMA completed a study of coastal flood hazards and released a draft preliminary map in March of that year.
• FEMA notified the City of a 90-day appeal period, from November 1, 2017 through January 29, 2018. The page states that no technical basis for appeal was identified and no appeal was filed.
• On June 20, 2019, FEMA issued a letter of final determination, and the new Flood Insurance Rate Map took effect on December 21, 2019.
• A corrected summary of map actions, issued August 1, 2019, showed that three earlier Letters of Map Amendment in Del Mar would be superseded by the new map.
• FEMA held a local assistance meeting at Town Hall on May 15, 2019 to explain the change.

The City’s floodplain appears on two FIRM panels, 06073C1307 and 06073C1309. Anyone can look those up on FEMA’s Flood Map Service Center.

What the newer modeling includes, and what it leaves out

According to the City, the current map reflects total water levels, dune erosion, wave setup, wave run-up, seawall overtopping, overland wave propagation, and coastal structures. It does not account for projected sea level rise. That last point is easy to miss. The map describes present-day conditions under its method; it is not a forecast.

The page also notes that a property owner may request a letter of map change, to FEMA’s satisfaction, based on specific adaptive design measures. That is a technical process with its own requirements, and its outcome rests with FEMA.

Where the VE zone reaches

The County’s 2023 hazard plan annex for Del Mar places the westernmost beachfront properties between 18th Street and the river mouth in the VE zone, associated with ocean flooding. The City’s page adds the reason: the coastal study indicated those beachfront properties should be mapped as Special Flood Hazard Area because of the high risk of wave action and coastal flooding, which extends the VE zone eastward past existing seawalls and onto private property. It also says other floodplain areas, including VE zones south of 18th Street and the river floodplain, would remain unchanged.

The same page carries an older note about properties west of Ocean Front Avenue and the City’s Floodplain Overlay Zone. Parts of that page were written before the new map took effect, so the current regulatory status of any parcel is a question for the City’s planning staff, not for a web page or for us.

What a VE zone asks of a foundation

FEMA’s Technical Bulletin 5 explains the free-of-obstruction rule for coastal high hazard areas. In broad strokes:

• New and substantially improved buildings in Zone V are elevated on pilings or columns so the bottom of the lowest horizontal structural member sits at or above the base flood elevation.
• The space below must be free of obstruction, or enclosed only with non-supporting breakaway walls, open wood lattice, or insect screening intended to give way under wave and water loads without damaging the elevated building.
• Solid foundation walls are not an accepted foundation in Zone V.
• Fill may not be used for structural support. The federal floodplain regulations, at 44 CFR 60.3(e)(6), say so directly.
• A registered professional engineer or architect certifies that the design meets the standard.

TB5 also describes how enclosed areas below the elevated floor may be used, essentially parking, building access, and storage, and it notes that larger enclosures can raise flood insurance costs. It discusses frangible slabs at grade, utilities kept off breakaway walls, and a door at the top of interior stairs leading down to a lower enclosure.

None of that applies automatically to an existing house. These standards attach to new construction and substantial improvement, and the City decides which category a given project falls into. Our entry on substantial improvement in North Beach cottages explains that threshold.

Reading an existing beachfront foundation through this lens

Even where no project is planned, the VE framework is a useful way to look at a house near the sand.

1. What carries the floor? Piles, columns, a perimeter wall, or a slab. Each behaves differently when waves and debris reach it.
2. What is underneath? Open space, a garage, storage rooms, or finished living area. Finished space below the flood elevation is the condition most likely to draw attention in any future review.
3. What has salt done? Concrete and connectors near the beach take a steady corrosive load. Our salt-air concrete corrosion page describes what to look for.
4. What does the seawall do for the house? A seawall and a foundation are separate systems. The new mapping specifically modeled overtopping, which is a reminder that water can reach a house behind a wall.
5. What records exist? An elevation certificate, past permits, and any prior map amendment correspondence are worth gathering before anyone proposes a scope.

Questions worth settling early

• Which zone and base flood elevation apply to this parcel on the effective map?
• Does an elevation certificate exist, and does it reflect the current structure?
• Is the work being considered a repair, a remodel, or something the City may treat as substantial improvement?
• What review will the City require, including any Floodplain Development Permit, Design Review, or coastal permitting? The City’s development applications page is the place to start, and the answer is the City’s to give.

What shapes the structural scope here

• The existing foundation type and its condition.
• Use and finish of any space below the base flood elevation.
• Corrosion of concrete, reinforcing, and connectors.
• The relationship between the house, the seawall, and the beach.
• Whether elevation or foundation replacement is under consideration.
• Engineering, surveying, and the City’s review requirements.

Beachfront projects in a VE zone call for specialists. We coordinate with licensed engineers as needed, including those who certify coastal foundation designs, and we keep our role to describing the structure clearly and helping prepare for review.

We serve all of Del Mar, from the beachfront blocks to the hillside streets above them. If you’d like a discreet look at a beachfront foundation and a written summary of what we see, arrange a Free Quote.