Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study

1. 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.

2. Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study • Physical Impacts • River hydraulics (flow, levels & sedimentation) • Deeper, hydraulically-efficient artificial channel • -- increases upstream salinity • -- increases water levels • -- changes flow patterns

3. Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study • Physical Impacts • River hydraulics (flow, levels & sedimentation) • Deeper, hydraulically-efficient artificial channel • -- increases upstream salinity • -- increases water levels • -- changes flow patterns • Storm water levels • -- Tide ranges increase up to 0.4 feet • -- Storm tides not described

4. Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study • Physical Impacts • River hydraulics (flow, levels & sedimentation) • Deeper, hydraulically-efficient artificial channel • -- increases upstream salinity • -- increases water levels • -- changes flow patterns • Storm water levels • -- Tide ranges increase up to 0.4 feet • -- Storm tides not described • Salt water intrusion • -- impacts to aquifer . . . not included

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

6. 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

8. NO ACTION (No Project) 50-Ft PROJECT

9. Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study Physical Impacts, Cont’d 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)

10. 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.

12. Coastal & Port Engineering Considerations of the Jacksonville Harbor Deepening Study • Fiscal Impacts • Initial Construction Cost • Fed: $350M (48%) Local: $384M (52%) • 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