Recommended dimensions for stabilized berms
Recommended dimensions for stabilized berms. Source: MnDOT 2018 Standard Specifications
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| Berm Type/Material | Recommended shape | Recommended base width | Recommended height | Recommended side slopes |
|---|---|---|---|---|
| Type 1 - compost | Trapezoidal | 5 feet | 2 feet (minimum) | 2:1 |
| Type 2 - slash mulch | Trapezoidal | 5 feet | 2 feet (minimum) | 2:1 |
| Type 3 - rock weeper system | Trapezoidal | 8 feet | 2 feet (maximum) | 2:1 |
| Type 4 - topsoil | Trapezoidal | 7 feet | 2 feet (minimum) | 2:1 |
| Type 5 - rock | Trapezoidal | 5 feet | 2 feet (maximum) | 2:1 |