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Modeling of Current Conditions

SR410 – White River Erosion Project Concept Modeling Ian Mostrenko (Herrera Environmental Consultants). Modeling of Current Conditions. Hydrologic Modeling Estimate peak river water flows Estimate timing, duration, and frequency Hydraulic Modeling Estimate water depths (flooding)

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Modeling of Current Conditions

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  1. SR410 – White River Erosion ProjectConcept ModelingIan Mostrenko(Herrera Environmental Consultants)

  2. Modeling of Current Conditions • Hydrologic Modeling • Estimate peak river water flows • Estimate timing, duration, and frequency • Hydraulic Modeling • Estimate water depths (flooding) • Estimate water speed (velocity) and erosive forces • Assess current flood and erosion hazards

  3. White River Basin Mud Mt. Dam • Selection of an appropriate hydrologic model will depend on river basin characteristics Clearwater River Greenwater River West Fork White River Huckleberry Creek Mt. Rainier

  4. Data for Hydrologic Modeling YEAR 1930 1940 1950 1960 1970 1980 1990 2000 2010 Calibration Rainfall Data Temperature Data Snow Pack Data Water Flow Data (White River) Water Flow Data (Greenwater River) Hydrologic Model Simulation

  5. Hydrologic Modeling • Two models used: • HEC-HMS (developed by US Army Corps of Engineers) • DHSVM (developed by University of Washington)

  6. Hydrologic Modeling

  7. Hydrologic Modeling

  8. Hydrologic Modeling

  9. Hydrologic Modeling

  10. Hydrologic Modeling

  11. Hydrologic Modeling

  12. Hydrologic Modeling LPIII Results:

  13. Hydraulic Modeling General Model (HEC-RAS) • Set boundary conditions for 2-D Model Problem Site Model (FLO-2D) • Detailed model for each site • Assess localized effects

  14. Reach-Scale Model Results Problem Site 9 (MP 41.4-42.0) Flooding across SR410

  15. Site 9 – 100yr Water Depth FLOW SR 410 FLOW

  16. Site 9 – 100yr Max Water Depth Nov 2006 Photo

  17. Site 9 – November 2006 Photo Flooding High Water Velocity

  18. Site 9 – 100yr Max Water Velocity

  19. Site 9 Proposed – Water Depth Change

  20. Site 9 Proposed – Water Velocity Change

  21. Site 9 – Detailed Modeling for Design • Future Modeling Efforts: • HEC-RAS – refined using LIDAR to add mode detail for Site 9 (complete January 2008) • SHAL2D – detailed Finite Element model to refine design and assess sediment transport (complete February 2008)

  22. Site 9 – Detailed Modeling for Design • HEC-RAS:

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