Many Del Mar owners have heard that the City has a sea-level rise plan. Fewer have read it. That’s understandable; it runs well past a hundred pages and much of it concerns beaches, lagoons and public infrastructure. Still, a few chapters speak directly to the ground under residential streets, and they are worth knowing before you plan a remodel, buy in North Beach or budget for work on a bluff-top house.
This is a homeowner’s reading of the document, with an eye on structure. It is not legal or planning advice, and the plan itself does not decide what any single property may do.
What the plan is
The cover of the version posted on the City’s website states that it was adopted by the City Council on October 1, 2018. The plan was prepared with consultants and a citizen advisory committee, and it sets out adaptation strategies for three areas of concern:
- San Dieguito River flooding in North Beach, the river valley and the Fairgrounds
- Bluff and adjacent beach erosion along the South Bluffs, Powerhouse Park and the North Bluffs
- Erosion and flooding along North Beach, from 15th Street north to the lagoon mouth
The City’s broad approach, as the plan describes it, favors beach nourishment and sand retention along with flood management. It aims to protect low-lying homes behind the first row of beachfront houses through maintenance of a public beach, dredging of the river channel as needed, and measures such as storm drain changes or a new “living levee.” The plan explicitly does not select planned retreat as a strategy.
Where it stands in the coastal program
A plan adopted by the Council isn’t the same as a certified part of the Local Coastal Program. According to reporting by The Coast News in June 2021, the City Council voted to withdraw its sea-level rise amendment from the Coastal Commission after Commission staff proposed 22 modifications. Status can change. If a project of yours depends on how sea-level rise policy applies, confirm the current position with the City’s planning staff.
The river chapter: why North Beach watches the channel
For North Beach owners, the primary flood risk the plan identifies isn’t waves. It’s the river. The plan notes that oceanfront seawalls give low-lying properties behind them some protection from wave attack, but that “the primary risk to these properties is river water flooding.”
The plan includes a table, drawn from a 2016 coastal hazards assessment, projecting how the annual chance of extreme river flooding could change if the river bed rises along with the sea. It shows a 1 percent annual chance today rising to about 5 percent with one foot of sea-level rise and matching channel deposition. That assumption, that the channel fills at the same rate the sea rises, is why the plan pays so much attention to channel dredging.
Among the options, the plan discusses elevating structures. It notes that the City already requires new construction in the current river floodplain to be elevated above the existing 100-year flood elevation under the National Flood Insurance Program. It also notes that FEMA’s program does not currently account for sea-level rise.
On the City’s flood map page, Del Mar explains that it regulates the 1 percent annual chance floodplain as its Floodplain Overlay Zone, and that the most recent FEMA rate map became effective in December 2019.
The North Beach chapter: elevation and its limits
The North Beach chapter is candid about elevating existing homes. It says raising structures can include pile foundations, but that there may be challenges with height limits, earthquake code compliance and other building codes. It adds that raising existing homes “may not be feasible from an engineering and cost perspective,” and is more feasible for new construction.
One observation stands out. The plan describes elevation along the beach as likely an “all or nothing” approach: if some homes are raised on pilings and neighbors are not, the unraised homes may be more exposed. For an individual owner, that is a reminder that elevation decisions sit inside a neighborhood context.
Our North Beach floodplain foundations page covers how those foundations are typically built and inspected, and our earlier post on substantial improvement for North Beach cottages explains why a remodel budget can trigger elevation rules.
The bluff chapter: drainage is the owner’s lever
The bluff chapter considers sand nourishment and retention below the southern bluffs and is plain about the limits: it would not affect the erosion processes at the bluff top.
What it does say about the top is practical. Among its best management practices, the plan lists control of surface runoff, avoiding concentrated flow down the bluffs, and reducing shallow groundwater that saturates upper soils. It also suggests the City look into whether over-watering of landscaping near the South Bluff contributes to groundwater reaching the bluffs.
For a homeowner near the bluffs, that translates into things you can check:
- where roof downspouts discharge, and whether any reach the bluff side of the lot
- whether irrigation runs longer or more often than plants need
- whether pool, spa or patio drains direct water toward the edge
- whether soil near the bluff side stays damp in dry weather
None of this changes the larger coastal forces acting on the bluffs. It’s simply the part of the picture an owner controls. Our bluff and seawall stabilization page describes how existing protective structures are assessed.
Monitoring and thresholds
A useful feature of the plan is that it ties future actions to observed conditions rather than fixed dates. It describes monitoring of sea levels, beach width, channel deposition and bluff retreat, with planning triggers as those measures change. That approach suggests owners won’t see one sweeping change, but a series of decisions spread over years. Following City Council agendas on coastal items is the simplest way to stay informed.
What this means for your house today
The plan doesn’t impose new requirements on an existing home just by existing. What it does is frame the questions an owner should bring to a remodel, purchase or repair:
- Is the property within the Floodplain Overlay Zone, and how does a planned project relate to elevation rules?
- On the bluffs, where does water from the lot go?
- Do the foundation and connections show signs of moisture, settlement or corrosion worth documenting now?
- Would a baseline condition record help when future policy or insurance questions arise?
A foundation inspection is a good way to establish that baseline. We coordinate with licensed engineers as needed for elevation, pile or bluff-related questions, and permit applications go through the City’s Building Services, which accepts building applications electronically. Approval and timing rest with the City and, where applicable, the Coastal Commission.
Factors that typically shape scope include the home’s flood zone status, foundation type, site access, drainage corrections, the condition of existing protective structures, and coastal permit requirements.
To talk through how the plan relates to your Del Mar property, request a Free Quote.