Protecting Your Investment: The Role of Seawalls in Property Value, Erosion Control, and Flood Mitigation
Seawalls are vital structures designed to shield coastal properties from the relentless forces of tides, waves, and the escalating threat of sea-level rise. In Miami Beach, approximately 91% of the 55 miles of seawalls are privately owned, underscoring the significant responsibility of individual property owners in fortifying their assets against flooding and erosion.
Types of Seawalls and Common Issues
- Concrete: Durable but requires heavy machinery for installation.
- Composite (wood): An alternative material but generally less durable than vinyl or concrete.
- Vinyl: The longest-lasting option, with a lifespan of up to 50 years, and easier to install.
- Corrugated steel panels: Economical and sturdy but prone to rust and corrosion over time, especially in saltwater environments.
Common issues with existing seawalls include:
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Soil erosion and sinking
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Cracks and leaning
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Dangerous pits or bubbling in the yard (often due to the fabric filter behind the wall deteriorating)
Regulatory Requirements and New Ordinances
Recognizing the critical role of seawalls in coastal defense, many cities, including Miami Beach, have instituted regulations to ensure their effectiveness. For example, as of January 2021, all new seawalls in Miami Beach must be constructed to a minimum elevation of 5.7 feet NAVD (North American Vertical Datum or official height above sea level).
In Fort Lauderdale, a 2023 ordinance increased the top elevation requirement from 3.9 feet to 5 feet. Typically, homeowners only need to raise their seawall if they are constructing a new one or if the existing seawall is in disrepair (for example, missing or broken piles, deteriorated panels, or tidal flows regularly impacting neighbors and/or city property).
Profound Influence on a Property’s Market Value
The presence and condition of a seawall can profoundly influence a property's market value. A well-maintained seawall not only acts as a barrier against erosion and flooding but also enhances the property's appeal to potential buyers, thereby increasing its marketability. Conversely, a deteriorating or insufficient seawall can deter buyers due to potential risks and the anticipated costs, permitting and significant time commitment for necessary repairs or upgrades.
Summary
In coastal regions like Miami and Miami Beach, seawalls are indispensable in defending properties against rising sea levels and erosion. For property owners, investing in seawall construction and maintenance is not just a regulatory obligation but a strategic move to preserve and enhance property values. By staying informed on regulations and leveraging financial support, homeowners can proactively contribute to their properties' resilience and the community's overall stability.
For steps to upgrade your seawall or reduce flood risk, read the following guide from the City of Miami Beach and check your property’s elevation using this Elevation Tool.
