Water: WARSSS
Surface Erosion
RRISSC Screening
Level Assessment
Steps 1. Land Use Activities
2. Hydro/Physio Inventory
3. Variables Influenced
4. Risk Rating System
5. Hillslope Processes
6. Mass Wasting
7. Roads
8. Surface Erosion
9. Hydrologic Processes
10. Flow Changes
11. Channel Processes
12. Stability Assessment
13. Streambank Erosion
14. In-channel Mining
15. Channel Impacts
16. Enlargement
17. Aggradation
18. Channel Evolution
19. Degradation
20. Sediment Risk Summary
21. Consequence Summary
22. Low Risk
23. Moderate Risk
24. High Risk
25. Mitigation
26. Monitoring
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Accelerated erosion can occur from surface erosion processes due to exposed bare soil, compaction, and poor conservation practices (e.g., by agriculture, surface mining, land clearing, and silviculture). Surface erosion occurring on steep, highly dissected slopes has a higher potential of conversion to stream-transported sediment due to rill and gully erosion. This risk needs to be considered for various surface disturbance activities that potentially affect such processes. A flow chart depicting the assessment methodology at this level is shown in Flowchart 9. The information needed to make this risk assessment is
| a) | Total acres being evaluated for a sub-drainage and soil type erodibility potential |
| b) | Acres impacted |
| c) | Per cent bare ground of impacted acres |
| d) | Drainage density of impacted slope or width of interfluve spacing |
| e) | Slope position and gradient (identify if highly dissected slope) |
| f) | Distance of disturbance to nearest stream |
| g) | Buffer width of riparian corridor |
The data entry, calculations and summaries are recorded on the surface erosion/sediment delivery risk rating worksheet (
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