reach 4 levee setback alternative 1 (review) levee setback alternative 2 presenter: david cline,...
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Whatcom County – Levee SWIF
Reach 4 Levee Setback Alternative 1 (Review)
Levee Setback Alternative 2
Presenter: David Cline, P.E., C.F.M. – Shannon & Wilson Inc.
Reach 4 – Levee Setback Alternative 1
Alternative 1 ReviewAlternative 2 Plan and Cost EstimatesCompare Existing and Alternatives Maintenance Costs
Reach 4 – Levee Setback Alt 1. Concept Design Plan
Reach 4 – Levee Setback Alternative 1Planning Level Cost Estimate
Description Low Cost Est. High Cost Est. New Setback Levee $12.0M $22.0MPipeline Protection / Replacement $2.0M $5.0MHabitat Restoration of River and Floodplain $2.0M $4.0MProperty Acquisition & Real Estate Administration $0.5M $2.6MEngineering Design $2.5M $5.0MPermits (3% of construction) $0.5M $1M Wetland/Stream Mitigation (3:1 Ratio) (35acres) $3.5M $7.1MConstruction Administration (12% of construction) $2.1M $4.0MProject Contingency (35%) $5.9M $11.6M
Project Cost Estimate - YR-2014 $31M $62MProject Cost Estimate - YR-2024 $42M $83M
Note: Cost estimate is in 2014 dollars. If future project implementation is in 10 years, then budgets would need to be escalated for ~3% annual growth (i.e. $83M and $42M costs in 2024 for high and low cost estimates).
Reach 4 – Levee Setback Alt 2. Concept Design Plan
Summary Reach 4 – Levee Setback Alternative 2
Description Low Cost Est. High Cost Est.
New Setback Levee $10.3M $18.3M
Pipeline Protection / Replacement $2.0M $5.0MHabitat Restoration of River and Floodplain $2.0M $4.0M
Property Acquisition & Real Estate Administration $0.5M $2.3M
Engineering Design $2.2M $4.4M
Permits (3% of construction) $0.4M $0.8M
Wetland/Stream Mitigation (3:1 Ratio) (35acres) $2.8M $5.5M
Construction Administration (12% of construction) $1.8M $3.5M
Project Contingency (35%) $5.1M $10.2M
Project Cost Estimate - YR-2014 $27M $54M
Project Cost Estimate - YR-2024 $36M $73M
Levee EconomicsReach 4 – Existing Conditions 50-YR Repair Costs
1973-1989 1990-2008$0
$10,000,000
$20,000,000
$30,000,000
$40,000,000
$50,000,000
50-Year Repair Costs50-Year Repair Costs (Hook Related)50-Year Repair Costs
Levee Economics50-YR Maintenance & Repair Costs
Existing 50-YR ALT1 50-YR ALT2 50-YR$0
$10,000,000
$20,000,000
$30,000,000
$40,000,000
$50,000,000
50-YR Maintenance Cost
Corps - ExistingLocal - Existing
Levee EconomicsAnnual Maintenance & Repair Costs
Existing 50-YR ALT1 50-YR ALT2 50-YR$0
$200,000
$400,000
$600,000
$800,000
$1,000,000
Annual Maintenance Cost
Corps - ExistingLocal - Existing
Reach 4 – Alternatives Summary
Existing Alt. 1 Alt. 2Project Cost
(2014 $) -- $31M - $62M $27M - $54M50-YR Maint. ($)
Local Corps
$9.8M $39.4M
$7.6M$30.5M
$6.0M$24.0M
Annual Maint. ($)LocalCorps
$197k$887k
$152K $610k
$121K$482K
Floodplain Connectivity Area
~0 AC ~142 AC ~142 AC
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