Potomac Waterfront Flood Mitigation Study - City of Alexandria

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ac acre A/E Architectural/Engineering ADA American with Disabilities Act ASCE American Society of Civil Engineers Acronyms and Abbreviations ASCE 24 ASCE Standard 24, "Flood Resistant Design and Construction" BAR Board of Architectural Review BCA Benefit Cost Analysis BCR Benefit Cost Ratio BFE Base Flood Elevation BRV Building Replacement Value C Centigrade CFM Certified Floodplain Manager CFR Code of Federal Regulations cfs cubic feet per second COA Certificate of Appropriateness CRS Community Rating System D.C. District of Columbia DCR [Virginia] Department of Conservation and Recreation DPZ Department of Planning and Zoning EAB Expected Annual Benefit EAP Expected Annual Probability FEMA Federal Emergency Management Agency FFE Finished Floor Elevation FIRM Flood Insurance Rate Map FIS Flood Insurance Study FMA Flood Mitigation Assistance FMV Fair Market Value GIS Geographic Information System 28-JUL-10\\ vi
GPS Global Positioning System HAZUS Hazards United States HMGP Hazard Mitigation Grant Program I&I Inflow and Infiltration IBC International Building Code IP Individual Permit IPCC Intergovernmental Panel on Climate Change JPA Joint Permit Application (USACE) LAG Lowest Adjacent Grade LSI Lower Substantial Improvement Threshold MD Maryland MHW Mean High Water NAVD88 North American Vertical Datum of 1988 NC North Carolina NEPA National Environmental Policy Act NFIP National Flood Insurance Program NGS National Geodetic Survey NGVD29 National Geodetic Vertical Datum of 1929 NHPA National Historic Preservation Act NPS National Park Service NPV Net Present Value NRHP National Register of Historic Places PDM Pre-Disaster Mitigation PID HV9658 Permanent Identifier for Benchmark Disk HV9658 RFC Repetitive Flood Claims RPA Resource Protection Area SFHA Special Flood Hazard Area SPGP State Program General Permit SRL Severe Repetitive Loss Acronyms and Abbreviations 28-JUL-10\\ vii
Page 2 and 3: F I N A L R E P O R T POTOMAC RIVER
Page 4 and 5: TABLE OF CONTENTS 6.1.2 Assumptions
Page 6 and 7: TABLE OF CONTENTS FIGURES Figure 1-
Page 10 and 11: TES Transportation and Environmenta
Page 12 and 13: SECTION ONE: INTRODUCTION 1.1 POTOM
Page 14 and 15: Introduction Factory and Strand Str
Page 16 and 17: Refinement of Mitigation Measures S
Page 18 and 19: 8.8 ft Figure 2-2: Flood Levels Stu
Page 20 and 21: Refinement of Mitigation Measures T
Page 22 and 23: Refinement of Mitigation Measures s
Page 24 and 25: Overview of Flood Mitigation Measur
Page 26 and 27: 3.1.3 Floodproofing Overview of Flo
Page 28 and 29: FLOOD ELEVATION BASE FLOW Overview
Page 40 and 41: E LURAY AV E GLENDALE AV EARL ST N
Page 42 and 43: N ALFRED ST MUIRS CT S COLUMBUS ST
Page 44 and 45: Technical Analyses Support resource
Page 46 and 47: Table 4-1: Repetitive Loss Properti
Page 48 and 49: Technical Analyses Support climate
Page 50 and 51: 5.2 CALCULATION OF PROJECT BENEFITS
Page 52 and 53: Economic Valuation (Benefit-Cost An
Page 54 and 55: Economic Valuation (Benefit-Cost An
Page 56 and 57: 6.1 FLOODWALL Structural Mitigation
Page 58 and 59:
Structural Mitigation Measure Conce
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Page 62 and 63:
6.1.3 Potential Impacts Structural
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VDEQ Section 401 Certification VDE
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6.2.1 Description of Alternative St
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CLIENT PROJ RAMSAY AL SWIFTS AL S L
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6.2.4 Permitting/Approval Requireme
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6.2.5 BCA and Results Structural Mi
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6.3.2 Assumptions Structural Mitiga
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CLIENT PROJ REVISION NO SCALE WALES
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Site Plan Approval Structural Mitig
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North Union Structural Mitigation M
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CLIENT PROJ REVISION NO SCALE S ROY
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King Street Residential Structural
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Waterfront Commercial Structural Mi
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7.2 KING STREET Elevated Walkway Re
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Figure 7-2: Elevated Walkway at Wat
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Recommendations The elevated walkwa
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King/Strand Street Intersection Roa
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Figure 7-6: Floodwall behind Torped
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7.7 REPETITIVE LOSS PROPERTIES Reco
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Recommendations (USBC) and Internat
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SECTION EIGHT: REFERENCES Access Fl
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References Huber Technology, 2009.
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Appendix A Initial Ranking of Poten
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Appendix B Ordinance and Sandbag In
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Exhibit 1-2. Sample ordinance from
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5. The necessity to the facility of
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Appendix C Non-Prioritized Measures
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Figure 1: Duckbill Check Valve A ty
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Relocate external electrical boxes
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Last, Hurricane Preparedness inform
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Potomac River Waterfront Flood Miti
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Figure A1-12 Exhibit 2: Field Visit
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Exhibit 2: Field Visit Summary - Ju
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Fig A11-1 Exhibit 2: Field Visit Su
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Figure A18-1 Exhibit 2: Field Visi
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Figure 21-3 Exhibit 2: Field Visit
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Figure 2: Screen shot from NOAA Atl
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Potomac River Waterfront Flood Miti
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38 40 38 4 6 40 34 28 14 30 30 40 4
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46 44 38 44 42 40 42 44 44 36 22 36
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48 44 38 36 38 18 46 42 38 42 26 22
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CLIENT PROJ REVISION NO SCALE City
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Table 4: Detailed cost estimate for
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Exhibit 3: Various Elevated Walkway
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Exhibit 4-2: Elevated Walkway - Kin
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Appendix H Berm
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Roadway Drainage Additional Data Ta
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Appendix J Property Acquisition
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Appraisals Based on data from Appra
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Exhibit 2. Total Other Costs for Pr
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Table 4: North Union Acquisition Co
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Appendix K Floodproofing
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Exhibit 2. Window Replacement Costs
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Elevate or relocate the electric pa
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Overview Potential Federal Funding
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Table 1. HMA Funding Options by Pro
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Hazard Mitigation Assistance The De
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program comparisons (continued) ELI
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program information GovDelivery Not
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Potomac Waterfront Flood Mitigation Study - City of Alexandria

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