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Comprehensive Overview of Levee Segment Analysis and Performance Assessment

This presentation provides an in-depth analysis of levee segment performance, focusing on the relationship to the overall levee system. It includes critical details about construction, ownership, and infrastructure concerns, along with a geographic overview. Key findings cover subsurface conditions, hydraulic performance, and history of issues like seepage and erosion. Comprehensive ICW ratings, risk assessments, and emergency preparedness strategies are also discussed. Maps and figures visually depict protected areas and identify critical features, facilitating a better understanding of flood-resilience tasks.

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Comprehensive Overview of Levee Segment Analysis and Performance Assessment

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Presentation Transcript

  1. Presenter Name Presenter Title Duty Location Date of Presentation Name of Levee Segment

  2. Levee Overview • USACE District • Name of Segment • Identify Segments relationship to Levee System (Does Segment = System, or is it only a part of a bigger system.) • Segment ID from NLD • Name of water course/river/creek • Authorization / Project • Identity of Owner Operator • Dates of Construction • Type of Presentation- MSC/National QA/SOG

  3. Location Map/Overview • Label state, region, major cities. • Identify critical infrastructure or special environmental concerns. • In Notes: Add details of location, length, description of protected area (rural/urban/industrial).

  4. Vicinity/Segment Map Figure with protected area polygon overlaid on google map/Corpsmap. • Identify location and number of embankment sections, floodwalls, pump stations, major culverts / penetrations, and protected area # of closures. [levee – brown line, floodwall – black line, pump station or culvert – orange dot,

  5. Geomorphology / Foundation Geology • Present typical foundation / subsurface conditions in longitudinal profile and or cross section.

  6. Typical Sections • Embankments, floodwalls, major culverts and other pertinent features • Label height, crest/top width, slope angles, drainage features, seepage barriers/cut off walls, etc

  7. Summarize Hydraulics • Frequency top of levee/floodwall or show on typical sections • Frequency toe of levee/floodwall or show on typical sections • Identify frequency of event that results in poor performance/history of problems • Summarize loading history – flood of record plus other major flood events

  8. Performance History • On Segment Map show area/ reaches with major seepage, boils, instability, flood fighting, overtopping, erosion, etc. • Indicate % of height of the levee / floodwall/culvert at which problems start to occur. • May be able to capture some or all of this information on previous slide otherwise show it here

  9. ICW Ratings • Include date of Inspection, date of Screening and who performed these tasks (AE/Corps/Others) • Short summary of ICW inspection and any issues noted

  10. Review/Compare ICW Rating with LST Rating in Table format Highlight LST ratings that are M or U. Review of Assessment Ratings

  11. Major Contributors to Overall Risk Rating • Focus discussion on selected items that were deemed Unsatisfactory and that are major contributors to the overall risk / rating. Include enough background data/documentation, and justification to make the case. Provide photos as additional slides that support the rating.

  12. Example: Culverts/Closure • If multiple culverts/closures are associated with project, the logic behind which one was rated should be provided by the LST Facilitator • Embankment culvert selected and why • * What was used to assess the culvert? Existing condition, supplemental tool, etc… • Floodwall culvert selected and why • * What was used to assess the culvert? Existing condition, supplemental tool, etc…

  13. Consequence Data Summary • Weighted Fatality Rate • Threatened Population without warning • Estimated Loss of Life without warning • Number of structures Inundated • Weighted economic damage factor • Economic Damages • Critical Infrastructure / Environments

  14. Emergency Preparedness • Evacuation Planning • Community Awareness • Flood Warning Effectiveness

  15. Plot Results LOL and Economics • National Roll-up Only Slide

  16. LSAC Rating Adjustments • National Rollup slide only • Reasons to adjust LSAC rating

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