Slope Remediation

1. ESS 315 – Tiffany Litz Slope Remediation

2. Will lead to loss of $$$s. Can lead to loss of lives. Avoidable messes Importance

3. Slopes are often located on coastal properties and offer beautiful views Despite risks, houses in these areas will always be desired. Importance

4. Importance The Seattle area has many unstable slopes that are prone to movement and slides.

5. https://myapa.planning.org/Landslides/Images/Landslides_Animation.gifhttps://myapa.planning.org/Landslides/Images/Landslides_Animation.gif Landslide in an area that has a retaining wall Careful planning is necessary to find the best solution for each slope. Importance

6. Creep - Slow and steady downward movement of a slope. • Indicated by curved tree trunks, bent fences or retaining walls, tilted poles or fences, and small soil ripples or ridges Unstable Slopes

7. Rockslide - Rock mass that suddenly detaches and falls from the top of a steep slope • Causes = gravity or freeze/thaw action Unstable Slopes

8. Mudslide – Sudden flow of mud down a slope • Occurs when soil becomes suddenly saturated (in storms, snow thaw, floods, etc) Unstable SlopeS

9. Earthflow – The upper section of a sloping water-soaked terrain that collapses, forming a tongue of land the length of the slope. Unstable Slopes

10. The effort to reduce the impact of land movement for people and their property. • can be used to strengthen roads, bridges, and other critical facilities. • guide local decision makers in their involvement with land use and development issues. Slope Mitigation

11. Four types: • Altering - Modifying the hazard involves eliminating or reducing the frequency of its occurrence. Stabilizing stream banks from continued erosion is an example. • Averting - Redirecting the impact away from a vulnerable location by using structural devices or land treatment can shield people and development from harm. Retaining walls and diverting runoff represent physical efforts implemented to keep the risk away from the people. • Adapting – Modifying structures and altering design standards of construction. Pre-identified landslide hazards require special building standards and construction practices in order to reduce vulnerability to damage. • Avoiding-- Keep people away from the hazard area or limit development in a risk area. Enforcement actions such as zoning regulations, building codes and ordinances are intended to restrict, limit or deny access to specially identified risk areas. Slope Mitigation

12. Terracing: Slope Mitigation – techniques

13. Retaining Wall Slope Mitigation – techniques

14. Mulching and Adding Groundcover Mulch protects against rain and wind, and reduces loss of soil moisture during extended dry periods. Slope Mitigation – techniques

15. Slope Mitigation –techniques Soil Redistribution

16. Slope Mitigation – techniques Deflecting Wall

17. Slope Mitigation – techniques Shotcrete: reinforces the strength of the rockface Drape Mesh: reinforces the strength of the rockface

18. http://www.terraerosion.com/projects/slope-stabilization.htm • http://www.ecy.wa.gov/programs/sea/pubs/93-30/vege01.html • http://landslides.usgs.gov/recent/archives/1997seattle.php • http://extension.missouri.edu/publications/DisplayPub.aspx?P=G1509 • http://pubs.usgs.gov/of/2004/1396/1396.gif • http://www.seattle.gov/DPD/Landslide/Study/part1.asp • http://faculty.washington.edu/tswanson/ESS/315/Student%20PP%20Presentations/sloperemediation.ppt Sources