Identifying and evaluating levee improvement alternatives the city of west sacramento
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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



SACRAMENTO RIVER

WEST NORTH (5.8 MILES)




DEEP WATER SHIP

CHANNEL WEST (18.9 MILES)


DEEP WATER SHIP

CHANNEL EAST (2.7 MILES)



SACRAMENTO RIVER

WEST SOUTH ( 6.3 MILES)




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