1. Erosion Control/Damage Topic H

2. Erosion & Sentiment Control Defined by: – Environmental Regulations – State and federal laws – Standard specifications, provisions and plans – Cooperative agreement with DNR Topic H

3. Resources Reference Documents and training aids – Construction and Materials Manual – Design Manual Outside Agencies – DNR – Consultants Topic H

4. Silt Fence Requirements Silt fence is intended to be utilized as a perimeter control to intercept sediment laden runoff. Topic H

5. Silt Fence Requirements ½ acre drainage area Sheet erosion 4 inch wide by 6 inch deep trench 2 feet of fabric above ground Stakes 2 feet in ground Stakes 8 feet apart Topic H

6. Other Sediment Control Storm drain inlet protection Earth dikes Sediment basins Pipe slope drains Vegetative cover Topic H

7. Backslope Erosion Solutions: – Salvaged topsoil – Swale with protection – Intercepting embankment Topic H

8. Figure 1: Backslope Erosion Topic H

9. Erosion Control Silt fences at toe of abutment. Fabric on slope Riprap on fabric Topic H

10. Figure 2: Erosion Control Topic H

11. Silt Screen Prevents siltation Containment protection Doesn’t work in heavy flowing water Topic H

12. Figure 3: Silt Screen Topic H

13. Silt Fence Prevents sediment runoff Perimeter control Topic H

14. Figure 3: Silt Fence Topic H

15. Silt Fence Maintenance Topic H

17. Steel Sheet Piling In place prior to excavation. Temporary Heavy riprap will replace Costly compared to silt screen – No displacement Topic H

18. Figure 4: Steel Sheet Piling Topic H

19. Salvaged Topsoil Intercepting embankment carries water. Use Crimped mulching. Topic H

20. Figure 5: Salvaged Topsoil Topic H

21. Riprap Reduces velocity of water Steeper grades Longer runs Topic H

22. Figure 6: Riprap Topic H

23. Erosion Mat/Riprap Very effective Topic H

24. Figure 7: Erosion Mat/Riprap Topic H