| Check Dam Type | Spacing for Various Ditch Slopes (feet)1 | Slope Applications | Longevity | |||
|---|---|---|---|---|---|---|
| Up to 2% | 3-5% | 6-9% | 10-15% | |||
| Mixed size rock (2 ft height) | 100 | 67-40 | 33-22 | 20-13 | Up to 15% | > 2 years |
| Rock bags (16 inch height) | 75 | 50-30 | 25-17 | 15-10 | Up to 15% | Up to 1 year |
| Rock bags (10 inch height) | 42 | 28-17 | 14-9 | 8-6 | Up to 15% | Up to 1 year |
| Triangular sediment dike (10 inch height) | 42 | 28-17 | 14-9 | 8-6 | Up to 15% | 1 to 2 years |
| Fiber log – wood / mulch (10 inch) | 42 | 28-17 | 14-9 | 8-6 | Up to 15% | 1 to 2 years |
| Fiber log – straw (10 inch) | 42 | 28-17 | 14-9 | NA | Up to 10% | Up to 6 months |
| 1 Note: reduce spacing intervals for highly erodible soils. | ||||||