Fixing Erosion on a Steep Slope with Tiered Stone Retaining Walls

A homeowner's 45-degree slope, stabilized with tiered Belgian stone every 3 feet, weed barrier, and rock, keeps failing—first from settling, then from heavy rains washing out soil beneath the barrier. They're considering deep-rooted shrubs or a concrete apron at the top to cascade water over the stones.

Root Cause: Water Management

Water flowing across the slope face is the primary enemy. Tumbled rocks and weed barrier alone cannot withstand concentrated water flow. The solution requires intercepting water before it reaches the slope.

Essential Solutions

• Gutter System: Install 6-inch minimum diameter pipes from roof gutters, discharging at the slope's toe—never on the face.
• Outlet Protection: Use drain rock or flared ends at pipe outlets.
• Armor the Slope Properly: A true "dry creek" needs 6-12 inches of rock with defined bed and banks—not a thin layer over fabric.
• Vegetation: Deep-rooted shrubs/trees help but only after water is controlled.

When to Call a Pro

If erosion is severe, professional help is cost-effective long-term. The expert references Walter Reeves' guide on when to hire specialists.

Concrete aprons can work if engineered correctly, but water interception remains the non-negotiable first step.