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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.

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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
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
levee deficiencies evaluated
Levee Deficiencies Evaluated
  • Geometry
  • Freeboard
  • Stability (static and rapid drawdown)
  • Seepage (through- and underseepage)
  • Erosion
  • Seismic Vulnerability
  • Vegetation*
data sources
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)
planning objectives
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
alternative plans
Alternative Plans
  • Single Deficiency Mitigation Measures
  • Levee Deficiency Groups
  • Combinations of Mitigation Measures
  • Mitigation Alternatives Selection Criteria
  • Mitigation Alternative Evaluation
evaluating alternatives
Evaluating Alternatives
  • System Continuity
  • Community Impact
  • Environmental Impact
  • Operation and Maintenance Costs
  • Construction Cost
mitigation alternative evaluation
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
slide18

SACRAMENTO RIVER

WEST NORTH (5.8 MILES)

slide21

DEEP WATER SHIP

CHANNEL WEST (18.9 MILES)

slide22

DEEP WATER SHIP

CHANNEL EAST (2.7 MILES)

slide24

SACRAMENTO RIVER

WEST SOUTH ( 6.3 MILES)