What Is a Berm?
A berm is a raised, shaped mound of soil used to guide water, create visual separation, protect plants, or add height to a landscape. Its slopes blend into the surrounding grade, so a berm looks like part of the land. Plants, mulch, stone, or lawn may cover its surface.
Quick Facts About Berm
Category
Landform feature
Used for
Drainage, screening, planting, and visual interest
Common confusion
A berm is not a retaining wall
Also called
Landscape berm, Landscape mound
Often discussed with
Landscape designer, Residential Landscape Design
Key Takeaways About Berm
- A berm has sloped sides that blend into nearby ground.
- Its shape controls water flow and creates planting space.
- A berm is not the same as a retaining wall.
How Berm Works
A berm changes the shape of the ground to direct water or create a raised planting area. Soil is placed in a planned form, then compacted enough to hold its shape. The sides need a smooth transition into the existing grade.
Related glossary terms: Grading, Swale, Erosion Control.
Surface cover helps protect the soil from rain and runoff. Grass, mulch, shrubs, or ground covers can finish the berm. A swale may work with the berm by carrying water along a lower path. A retaining wall may support a steep edge when sloped soil cannot hold the desired shape.
Landscape designers place berms where their shape supports the larger site plan. A berm can screen a view, frame a planting bed, or guide runoff toward an approved drainage area.
Expert Note
When we plan a berm, we study the existing grade, soil movement, and nearby drainage paths. We shape the slopes so mowing, planting, and maintenance remain practical. We also check how the berm will look from windows, walkways, and property edges.
Berm in Practice: A Real-World Example
For an Issaquah yard beside a busy street, a landscape designer might shape a berm along the property edge. Evergreen shrubs and ground cover can soften the mound while the soil changes the view and guides surface water.
Related Services
Related Terms
Grading
Grading is the planned shaping of soil to create useful slopes and level areas on a…
Swale
A swale is a shallow, sloped channel that guides and slows stormwater across a landscape. It…
Erosion Control
Erosion Control is the practice of keeping soil in place and limiting its movement by rain…
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