Prioritize forest catchments needing conservation action.
Inputs, example and sources
United States Department of Agriculture Forest Service · A Guide for Predicting Sheet and Rill Erosion on Forest Land
Government publication · 1980 technical publication SA-TP 11; Universal Soil Loss Equation, printed page 2; metric conversion appendix, printed page 40
The historical source verifies the factor product. Local factor choice and suitability still need confirmation; this is not a full RUSLE2 implementation.
Keep the same place, observation period, definitions, units and source versions.
Analysis inputs. Rainfall erosivity [MJ mm/(ha h year)]; Soil erodibility [t ha h/(ha MJ mm)]; Slope-length and steepness factor [ratio]; Cover-management factor [fraction]; Support-practice factor [fraction]
Other required evidence. Catchment; erosion factors; downstream dependence; forest condition; current controls.
Fictional worked example · 2025
Laggala Pallegama — watershed protection · Laggala Pallegama
| Input or result | Value | Unit |
|---|
| Rainfall erosivity | 950 | MJ mm/(ha h year) |
| Soil erodibility | 0.035 | t ha h/(ha MJ mm) |
| Slope-length and steepness factor | 2.8 | ratio |
| Cover-management factor | 0.24 | fraction |
| Support-practice factor | 0.7 | fraction |
| Estimated annual sheet/rill loss | 15.641 | t/ha/year |
|---|
This USLE factor product is not a full RUSLE2 run, measured loss, delivered sediment, gully loss or landslide forecast. Local factors and uncertainty need review.
Proposed checking role. Forester, inventory specialist and biodiversity specialist.
After the action. Measured soil/land condition and treatment performance, with uncertainty.
Institution and data context
- Forest Conservation functions — Government publication. Full method locator not established. Institutional context; does not establish the calculation or local approval.
- USDA RUSLE2 overview — Government publication. Water Erosion RUSLE2: overview and official program and database. Institutional context; does not establish the calculation or local approval.
- IPCC 2019 Refinement — Institution publication. Full method locator not established. Institutional context; does not establish the calculation or local approval.
Confirm local scope, data rights, parameters and responsible roles in this Institution review. Published components retain their source; they do not approve the local application.