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Travis Ball, PE USACE Seattle Hydraulic Engineering Section 2 May 2014

HWY 530 Landslide: Hydraulic Modeling in Support of County, State, and Federal Long-Term Planning. Travis Ball, PE USACE Seattle Hydraulic Engineering Section 2 May 2014. FEMA’s Hydraulic Modeling Effort: Mission Assigned to USACE.

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Travis Ball, PE USACE Seattle Hydraulic Engineering Section 2 May 2014

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  1. HWY 530 Landslide: Hydraulic Modeling in Support of County, State, and Federal Long-Term Planning Travis Ball, PE USACE Seattle Hydraulic Engineering Section 2 May 2014

  2. FEMA’s Hydraulic Modeling Effort: Mission Assigned to USACE • Planning-level modeling to help inform decision makers about long-term flood risks and channel alignment/geometry alternatives • Continue and add to the long-term modeling effort that will be ongoing by various parties for several months

  3. Flow and Lake Level

  4. North Combo Middle

  5. Pre-Slide Conditions: 100-yr Event Slide Reach C-Post Road

  6. Present Conditions: 100-yr Event Slide Reach 300.2 279.6 C-Post Road Current channel alignment and geometry

  7. Future: North Alignment - 100yr Event Slide Reach C-Post Road

  8. Future: Middle Alignment- 100yr Event Slide Reach C-Post Road

  9. Future: Combo Alignment- 100yr Event Slide Reach C-Post Road

  10. Future: North Alignment - 100yr Event

  11. Future: Middle Alignment- 100yr Event

  12. Future: Combo Alignment- 100yr Event

  13. Future: 2yr Event – 150’ Wide Slide Reach C-Post Road

  14. Future: 2yr Event – 75’ Wide Slide Reach C-Post Road

  15. Future: 10yr Event – 150’ Wide Slide Reach C-Post Road

  16. Future: 10yr Event – 75’ Wide Slide Reach C-Post Road

  17. Excel Summary of Alignment Alternatives

  18. Slide developed by Casey Kramer

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