Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study

Kevin Bodge, Ph.D., P.E.

Port & Coastal Engineer Senior Vice President -- Olsen Associates, Inc.

Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study

Physical Impacts

1. River hydraulics (flow, levels & sedimentation) Deeper, hydraulically-efficient artificial channel -- increases upstream salinity -- increases water levels -- changes flow patterns

Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study

Physical Impacts

1. River hydraulics (flow, levels & sedimentation) Deeper, hydraulically-efficient artificial channel -- increases upstream salinity -- increases water levels -- changes flow patterns 2. Storm water levels -- Tide ranges increase up to 0.4 feet -- Storm tides not described

Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study

Physical Impacts

1. River hydraulics (flow, levels & sedimentation) Deeper, hydraulically-efficient artificial channel -- increases upstream salinity -- increases water levels -- changes flow patterns 2. Storm water levels -- Tide ranges increase up to 0.4 feet -- Storm tides not described 3. Salt water intrusion -- impacts to aquifer . . . not included

Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study SOME OF THE STUDIES NOT IN THE DRAFT REPORT FOR PUBLIC REVIEW & COMMENTS

Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study

Physical Impacts, Cont’d

4. Salinity - The Corps claims that natural changes in salinity cause more stress than the project’s changes.

- The impacts are real, but not clearly presented -- Fish & shrimp studies etc. are still ongoing

NO ACTION (No Project) 50-Ft PROJECT

Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study

Physical Impacts, Cont’d

5. Ship Wake and Bank Erosion -- Corps study claims no increase in ship wake, but that is based upon the current design vessel.

-- Deeper channel  Bigger Ships  Greater Ship Waves 970’ ship length at 15 knots: wake = 3.7’ 1260’ ship length at 15 knots: wake = 6.8’ (84% increase) 970’ ship length at 10 knots: wake = 0.4’ 1260’ ship length at 10 knots: wake = 1.0’ (150% increase)

Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study

Physical Impacts, Cont’d

6.

Offshore Disposal Area -- Construction requires disposal of 18 million cubic yards (mcy) -- Existing offshore disposal area capacity = 3.3 mcy -- Expanded offshore disposal area close to sand borrow areas.

Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study

Fiscal Impacts

1. Initial Construction Cost Fed: $350M (48%) Local: $384M (52%) 2. Maintenance Dredging Costs -- Fiscal projections are not included in report -- Local cost-share increases from 0% to 50% !

Dredging requirements will increase by 130,000+ cy/yr or, about $1.2M per year.

Probable annual dredging req’t = 1,540,000 cy/yr Probable equivalent total cost = $14 million / year Probable NON-FEDERAL cost = $7 million/year.

My estimates, not in report