1 / 26

Identifying and Evaluating Levee Improvement Alternatives – The City of West Sacramento

Identifying and Evaluating Levee Improvement Alternatives – The City of West Sacramento. Michael J. Vecchio , P.E. Watershed Planning and Design Sacramento, CA PRESENTED AT: Association of State Flood Plain Manager’s Conference 20 May 2010. Purpose and Scope.

Antony
Download Presentation

Identifying and Evaluating Levee Improvement Alternatives – The City of West Sacramento

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Identifying and Evaluating Levee Improvement Alternatives – The City of West Sacramento Michael J. Vecchio, P.E.Watershed Planning and Design Sacramento, CA PRESENTED AT: Association of State Flood Plain Manager’s Conference 20 May 2010

  2. Purpose and Scope • Analyze problems and opportunities associated with existing levee system and its upgrade • Define levee system upgrade alternatives • Evaluate alternatives with respect to technical adequacy, environmental and community impact, and construction costs • Recommend upgrade alternatives for all currently deficient levee reaches

  3. Levee Deficiencies Evaluated • Geometry • Freeboard • Stability (static and rapid drawdown) • Seepage (through- and underseepage) • Erosion • Seismic Vulnerability • Vegetation*

  4. Data Sources • West Sacramento Levee System Problem Identification and Alternatives Analysis Volume 1: Geotechnical Problem Identification (Kleinfelder, 9/21/2007) • Phase 1 Geotechnical Evaluation Report, West Sacramento (URS, 11/2007) • West Sacramento Levee System: Problem Identification Report; Erosion Assessment and Treatment Alternatives (NHC, February, 2008) • West Sacramento Levee Evaluation Project: Draft Problem Identification Report (HDR, 4/28/2008)

  5. Planning Objectives • Improve level of flood protection • City Ordinance 07-11: 200-yr Flood Protection • Certification under 44 CFR 65.10 and Accredited by FEMA • Flood protection objectives are primary • Recreation and restoration objectives are secondary

  6. Alternative Plans • Single Deficiency Mitigation Measures • Levee Deficiency Groups • Combinations of Mitigation Measures • Mitigation Alternatives Selection Criteria • Mitigation Alternative Evaluation

  7. Single Deficiency Mitigation Measures

  8. Deficiency Groups

  9. Combinations of Mitigation Measures

  10. Evaluating Alternatives • System Continuity • Community Impact • Environmental Impact • Operation and Maintenance Costs • Construction Cost

  11. Mitigation Alternative Evaluation • Criteria: system continuity, community impact, environmental impact, operation and maintenance cost, construction cost • Qualitative Evaluation – ‘negative’, ‘average’, ‘positive’ • Scoring • Negative = -1 • Average = 0 • Positive = 1

  12. Sacramento Bypass (1.2 miles)

  13. SACRAMENTO RIVER WEST NORTH (5.8 MILES)

  14. PORT NORTH (4.9 MILES)

  15. YOLO BYPASS (3.7 MILES)

  16. DEEP WATER SHIP CHANNEL WEST (18.9 MILES)

  17. DEEP WATER SHIP CHANNEL EAST (2.7 MILES)

  18. PORT SOUTH (3.6 MILES)

  19. SACRAMENTO RIVER WEST SOUTH ( 6.3 MILES)

  20. SOUTH CROSS (1.2 MILES)

  21. WEST SACRAMENTO LEVEE SYSTEM IMPROVEMENTCONSTRUCTION COST OPINION

More Related