Kentucky State University Cooperative Extension Connections
Understanding Soil Erosion Risk
Following Timber Harvesting
Manisha Parajuli, Ph.D., Assistant Professor of Forestry, Kentucky State University
Richard Cristian, Ph.D., Extension Specialist & Regions Bank Endowed Associate
Professor of Forest Operations, Auburn University
Soil erosion is the detachment, transport, and loss of soil particles from the land surface by agents such as rainfall, surface runoff, wind, or human disturbance. In forestry, soil erosion is an important concern on timber harvest sites because harvesting activities can disturb the soil surface and increase the risk of soil loss and sediment movement into nearby streams and waterways (Parajuli et al., 2022; Picchio et al., 2021). Over time, various approaches have been developed to estimate soil erosion rates (Table 1). This info sheet provides an overview of soil erosion prediction on forest land and offers guidance on using the Universal Soil Loss Equation (USLE) to estimate potential erosion rates following timber harvest operations. This info sheet is intended for forest landowners, foresters, logging professionals, and natural resource managers who are interested in assessing erosion risk on forest harvest sites. By understanding erosion risk, they can select and implement appropriate Best Management Practices (BMPs) to minimize soil loss, protect water quality, maintain site productivity, and reduce environmental impacts associated with harvesting activities (Parajuli et al., 2024; Rijal et al., 2023).
Table 1. Soil erosion assessment methods.
| Method | Description | Scale | Best for |
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| Sediment capture | Erosion can be measured by physically capturing sediments or monitoring soil level changes.
Common sediment capture techniques include runoff plots, sediment traps/check dams, silt fences, and sediment collection tanks. | Plot to small watershed | Field checks; short-term erosion; small experiments |
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| Water sampling | Measuring suspended sediments in runoff water.
Common water sampling techniques include grab sampling and automatic water samplers. | Event/continuous | Storm event monitoring; water quality; sediment transport quantification |
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| Tracer techniques | Estimating past erosion by analyzing natural or artificial isotopes. Common tracer techniques include compound-specific stable isotopes and fallout radio nuclides. | Hillslope-watershed | Long-term erosion; sediment source tracking |
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| Geotechnical tests | Tests soil resistance to erosion under controlled hydraulic conditions, such as Jet or Hole Erosion Tests. | Lab/site-specific | Infrastructure design; levee/dam safety |
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| Erosion prediction models | Uses empirical or physical models, such as USLE/RUSLE and WEPP, to estimate soil loss. | Plot-regional | Planning; scenario modeling; GIS-based erosion mapping |
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