Earth Anchors for Steep Slopes

When installing erosion control blankets, a key consideration is the slope's gradient and length. While short, low-gradient slopes offer flexibility in installation, long and steep slopes require a more deliberate approach to prevent erosion and ensure the blanket's stability.

Earth Anchors for Steep Slopes
For slopes that are long, steep, or experience high-velocity water flow, using earth anchors in addition to staples is highly recommended. Earth anchors provide a more robust and permanent fastening solution, distributing the load and preventing the blanket from sloughing or being washed away.

An earth anchor is a specialized device driven or screwed into the ground that, once set, provides significant holding power. They work by creating a large resistance area below the surface, much like a toggle bolt in drywall.

Installation with Earth Anchors
Preparation: Before installation, clear the slope of any large rocks, sticks, or debris that could puncture the blanket.

Trenching: At the top of the slope, dig a shallow, 6-inch trench. This allows you to bury the leading edge of the blanket, preventing water from getting underneath and undermining the installation.

Rolling: Roll the erosion control blanket down the slope, keeping it taut and free of wrinkles. On steep slopes, roll it vertically to minimize stress on the material.

Anchoring:

Top: Secure the blanket's top edge in the trench with staples and then backfill the trench.

Main Body: The main body of the blanket should be secured with a combination of staples and earth anchors. A common pattern is to use staples in a grid pattern (e.g., 2-3 staples per square yard) with an earth anchor placed at regular intervals, particularly in areas of high stress like gullies or swales.

Anchor Placement: Place the earth anchors along the length and width of the blanket, following the manufacturer's recommendations. Drive or screw the anchor into the ground until it is fully buried, then "set" it by pulling the attached cable or strap to engage the anchor's locking mechanism.

Overlapping: Overlap subsequent blankets by at least 4-6 inches and secure the overlap with an additional row of staples.

Proper use of earth anchors is a critical step in ensuring the long-term success of erosion control projects on challenging slopes. They provide the extra security needed to withstand significant forces and protect the soil from degradation until vegetation can establish.