Erosion Control for Slopes and Lake Banks in Central Florida

Sandy soil has almost no cohesion. Put it on a slope, hit it with a summer thunderstorm, and it moves. We see the result on driveway banks, along lake shorelines, below downspouts and on the fill slopes around new construction across Polk County: a gully after every heavy rain, mulch washed onto the sidewalk, roots exposed, and in the worst cases a bank that has retreated toward the house. Here is how we approach it.

First, find where the water comes from

A slope rarely erodes from rain falling on it alone. It erodes from water arriving from above it: a downspout, a driveway sheeting water onto the bank, a neighbor's lot draining across it, a sprinkler zone running too long. Redirecting or spreading that water is often most of the fix and costs the least. Our drainage diagnosis guide covers how to trace it.

Roots hold sand

On most residential slopes the answer is a dense planting whose roots knit the soil together. Turf works on gentle slopes that can be mown safely. On anything steeper, or anywhere a mower cannot go, a spreading groundcover or a mix of shrubs and groundcover does the job better and does not need cutting. Perennial peanut, sunshine mimosa and juniper hold sunny banks; Asiatic jasmine and liriope hold shaded ones. Our post on groundcovers goes through the options.

Until the plants close in, the slope needs holding by something else: a biodegradable erosion blanket or coir matting pinned over the soil, planted through, keeps the bank in place through the first wet season while the roots establish. Mulch alone washes off a slope.

Lake banks

A lakefront lawn mown straight to the water has almost no root mass at the edge, and boat wake, wind and rain take the bank a little at a time. A planted strip along the shoreline stabilizes it, slows runoff, and takes up nutrients before they reach the lake. Native wet-tolerant plants along the water line do most of the work. On banks that are actively undercutting, coir logs at the toe of the slope hold the base while the planting takes hold. Anything that involves working at or below the water line may need a permit, and it is worth checking before starting. Our lakefront lawn guide covers the rest of the property.

Grade and terracing

Where a slope is too steep to plant and hold, breaking it into steps reduces the distance water can build speed. Two or three low terraces, each planted, hold far better than one steep face. On a short, steep bank a single low wall at the base with a planted slope above it is often the most economical answer.

When a wall is the right answer

A retaining wall is for slopes that cannot be laid back or planted, for ground that has to be held at a specific line, or for creating usable flat space. It is the most expensive option and the one most often built wrong, usually without drainage behind it. Our post on retaining wall installation covers materials and the drainage that decides whether it lasts.

Downspouts and the strip below them

The single most common small erosion problem is the gully below a downspout. An extension that carries the roof water past the bank, a splash block, or a buried line to a dry well fixes it in an afternoon and stops the gully from becoming a foundation problem.

What we do

We handle slope planting, shoreline stabilization, grading and walls across the service area. Request a visit and we will trace the water, look at the slope and tell you which fix it actually needs, or see our landscape services.