Potomac Waterfront Flood Mitigation Study - City of Alexandria

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8.8 ft Figure 2-2: Flood Levels Studied Refinement of Mitigation Measures 13.2 ft Extreme with 3 feet freeboard 10.2 ft 8.0 ft 4.0 ft 2.2 ft -0.9 ft Extreme (100-year flood level) Hurricane Isabel Intermediate Nuisance Mean High Water Mean Low Water * NAVD 88 28-JUL-10\\ 2-3
2.2 LIST OF COMPREHENSIVE FLOOD MITIGATION MEASURES Refinement of Mitigation Measures A comprehensive list of potential flood mitigation measures was developed. This list, which includes 27 potential flood mitigation measures, was developed through a comprehensive brainstorming process in conjunction with the City and from input provided in public meetings that occurred from October 2007 through November 2008. The potential flood mitigation measures were classified by type of mitigation into the following categories: Property Protection Structural Projects Flood Prevention Emergency Services Public Education and Awareness A “do-nothing” option was also defined; however, this was used as the baseline alternative and only analyzed during this preliminary solution analysis. Within each type of measure, each alternative was given a general solution title. For example, solutions under property protection that involve preventing damage to contents within a structure are classified as floodproofing solutions. The comprehensive list of potential flood mitigation measures is provided in Table 2-2. Table 2-2: Summary of All Flood Mitigation Alternatives Considered Type of Measure Solution Description PP1. Provide wet floodproofing to make uninhabited portions of structures resistant to flood damage. PP2. Provide dry floodproofing with impermeable membranes and watertight Floodproofing shields to prevent floodwaters from entering Property Protection buildings. PP3. Relocate internal supplies, products/goods, and utilities above the flooding depth. PP4. Relocate external electrical boxes. Acquisition PP5. Acquire properties experiencing frequent flooding. Elevation of structure PP6. Elevate structures. Structural Projects Floodwall Raised boardwalk acting as floodwall Stormdrain improvements S1. Build an engineered structure to act as a barrier between the Potomac River and Alexandria S2. Build a pedestrian boardwalk that would also be a floodwall structure. S3. Increase the inlet and road elevation to prevent overflow from nuisance flooding events. S4. Increase the storm drain pipe size. S5. Eliminate Inflow and Infiltration (I&I). 28-JUL-10\\ 2-4
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 8 and 9: ac acre A/E Architectural/Engineeri
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 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
Page 60 and 61: Structural Mitigation Measure Conce
Page 62 and 63: 6.1.3 Potential Impacts Structural
Page 64 and 65: VDEQ Section 401 Certification VDE
Page 66 and 67: 6.2.1 Description of Alternative St
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CLIENT PROJ RAMSAY AL SWIFTS AL S L
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Structural Mitigation Measure Conce
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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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