CASE STUDY
Seawall Void & Erosion Repair at Four Winds Marina
Protecting Southwest Florida’s Coastal Infrastructure with Advanced Engineering
Seawall Repair Project Summary: Four Winds Marina
Location: Four Winds Marina, Southwest Florida
Client Type: Commercial Marina Service Areas: Cape Coral, Naples, Fort Myers, Bonita Springs, Punta Gorda, Port Charlotte
Seawall Savers™ was contracted to address severe voids, erosion, and structural instability threatening the seawall at Four Winds Marina. This high-traffic marina faced increasing risk due to tidal stress, blocked drainage, and soil loss—all common issues in aging Florida marina seawalls.
The Challenge: Subsurface Erosion & Seawall Instability
The marina’s 30+ year-old seawall, located behind multiple boat racks, was under significant stress from environmental and structural factors:
- Voids and Sinkholes: Large underground voids formed from soil migration through separated seawall joints.
- Hydrostatic Pressure: Clogged weep holes caused water pressure buildup behind the wall.
- Soil Displacement: Wave action and tides continually washed soil away from the backside of the panels.
- Drainage Failure: Marine growth and sediment clogged weep holes, reducing pressure relief.
These issues posed a direct threat to the wall’s integrity—and to marina operations.
Using a combination of site inspection, geotechnical analysis, and hydrostatic testing, our marine engineers diagnosed the root causes behind the damage:
- Subsurface Voids: Located behind seawall panels using soil probes and hydro-locating tools.
- Seawall Seam Soil Loss: Caused by saltwater infiltration and lack of protective coatings.
- High Boat Wakes and Rushing Tides: Due to location of seawall next to bridge and fast-moving currents
- Weep Hole Blockages: Leading to pressure build-up behind the wall.
We also mapped how soil was migrating through the seawall system using safe environmental drainage dye ensuring we addressed every erosion point.
A Smarter Repair Plan for Coastal Seawall Stability
Seawall Savers™ implemented a multi-phase precision repair plan designed to stabilize the existing wall and prevent future erosion.
State-of-the-Art Seawall Stabilization System
Protect your seawall from internal erosion, joint failure, and soil loss with Seawall Savers™’ advanced seam repair technology:
- Erosion Guard Panels – Marine-grade Starboard® panels shield vulnerable seawall joints from impact and erosion.
- Permeable Foam Inserts – Engineered open-cell foam allows water to pass while trapping soil, preventing voids and sinkholes.
- Stainless Steel Fastening System – 316-grade stainless hardware ensures long-term corrosion resistance in saltwater environments.
- Wave Energy Dissipation – Reduces hydraulic pressure at the wall face, extending seawall lifespan.
- Minimal Disruption Installation – Installed from the water or land with minimal impact to landscaping or structures.
- Ideal for Aging Seawalls – Reinforces structural integrity without full wall replacement.
Engineered for Florida’s harsh coastal conditions — tested, proven, and built to last.
Smart Drainage Solutions
- Jet Filter Drainage Technology – Engineered to release trapped water behind the seawall while blocking soil migration.
- Built-In Soil Separation – Each Jet Filter includes a precision-mesh barrier to keep fill material in place and protect your foundation.
- Pressure Relief for Seawalls – Reduces hydraulic stress caused by heavy rain, tides, or fluctuating water levels.
- Durable & Corrosion-Resistant – Jet Filters are manufactured with marine-grade plastic for long-lasting coastal durability.
- Easy Installation – Designed to retrofit onto existing seawalls with minimal impact to structures or landscaping.
- Low Maintenance, High Impact – Smart, self-cleaning filters deliver reliable drainage with little to no upkeep.
Drainage Balancing
Together, They Provide Complete Seawall Protection
- Stops Soil Migration at the Source – Erosion Guard Panels prevent soil exposure, while Jet Filters ensure water drains safely.
- Preserves Structural Integrity – Prevents internal voids, sinkholes, and slab settlement behind the seawall.
- Ideal for HOA, Marina & Waterfront Properties – Especially valuable where land use, infrastructure, or access is limited.
- Environmentally Friendly Solution – Minimizes soil disruption and allows natural drainage without chemical agents.
- Engineered for Coastal Florida – Designed to outperform in high-salinity, high-pressure marine environments.
Results & Outcomes
Performance Metric
Result
Soil Loss Eliminated
Seam sealing and smart drainage prevented future soil migration
Hydrostatic Pressure Mitigated
Jet filters and weep hole restoration normalized internal pressure
Operational Disruption
None—project completed in stages, with active marina operations maintained
Cost vs. Replacement
Repair was 70% less than total replacement, with similar longevity
Lifespan Added
25+ years of performance added to existing structure with minimal maintenance required
Marina & HOA Application
This project exemplifies the repair solutions we provide for:
- Marinas with aging seawalls and soil settlement behind docks, walkways, and boat racks
- HOAs managing shared canal walls or common seawall infrastructure
- Waterfront Communities with tight access or sensitive landscaping
Whether you manage a 100-slip marina or represent an HOA, our modular marine equipment and engineering-first approach ensures minimal disruption and maximum structural return.
Why Choose Seawall Savers™
- 25+ years of proven marine construction and foundation repair experience
- Florida Licensed Contractor (#CBC1252534 / #CBC1263386)
- Certified in Helical Piling, Foam Injection, Deep Foundations, and Seawall Reinforcement
- Water-access installation using marine barges for tight spaces or HOA developments
- Trusted by marinas, HOA boards, engineers, and coastal planners throughout Southwest Florida
- Transparent pricing, free inspections, and reserve planning for long-term asset protection
Frequently Asked Questions
Look for cracks, joint separation, sinking soil, rust staining, or soft ground behind the wall. These signs often precede structural failure.
Yes. We specialize in barge-based and marine-access repairs for tight or restricted sites.
Helical piles offer deep foundation support without large excavation. They’re ideal for replacing failed tie-back systems or adding anchoring strength.
Our foam and grout repairs are engineered to last 20–30 years or more, with minimal maintenance.
Absolutely. We provide HOA presentations, reserve planning, and phased installation options tailored to group ownership settings.
Schedule a Free Seawall Inspection
Don’t wait until soil loss turns into a sinkhole. Let our team inspect and design a cost-effective solution for your marina or HOA seawall project.
Serving: Cape Coral, Fort Myers, Naples, Bonita Springs, Punta Gorda, Port Charlotte
Request a Consultation
Or call: (239) 284-6830
Final Thoughts
Four Winds Marina’s repair proves that you don’t have to replace your seawall to restore its safety and stability. Proper engineering, modern materials, and regional expertise, can stop voids, prevent sinkholes, and protect your waterfront asset—while staying within budget.
About the Author
Charlie Garcia is a Florida-certified building contractor and a seasoned marine construction expert with over 25 years of experience serving coastal communities throughout the state. Based in Cape Coral, he holds multiple licenses, including Florida License #CBC1252534 and #CBC1263386, along with specialized certifications such as:
- Certified Helical Piling Inspector
- Certified Marine Contractor
- Certified Deep Foundation Contractor
- Certified Foam Injection Contractor
Charlie is trusted across the industry for his expertise in seawall repair, erosion control, foundation stabilization, and marine structural restoration.