Potomac Waterfront Flood Mitigation Study - City of Alexandria

TABLE OF CONTENTS
FIGURES
Figure 1-1: Lower King Street Area after Hurricane Isabel, 2003..............................................1-2
Figure 1-2: Focus Areas.............................................................................................................1-4
Figure 2-1: Inundation Areas for Selected Flood Level Categories............................................2-2
Figure 2-2: Flood Levels Studied...............................................................................................2-3
Figure 3-1: Floodgate.................................................................................................................3-3
Figure 3-2: Three-Foot Dry Floodproofing Limitation...............................................................3-4
Figure 3-3: Flooded Building.....................................................................................................3-4
Figure 3-4: LAG Elevated to Protect Building from Flooding ...................................................3-5
Figure 3-5: Floodproof Door......................................................................................................3-6
Figure 4-1: Calculated Flood Zone Compared to FEMA Flood Zones.......................................4-2
Figure 4-2: Structures Predicted to be Flooded for Each Flood Event........................................4-4
Figure 6-1: Proposed Floodwall Layout.....................................................................................6-4
Figure 6-2: Interior Drainage Area of Proposed Floodwall ........................................................6-6
Figure 6-3: Proposed Elevated Walkway Cross-Section ..........................................................6-11
Figure 6-4: Proposed Elevated Walkway Layout .....................................................................6-13
Figure 6-5: Interior Drainage Area of Proposed Elevated Walkway ........................................6-14
Figure 6-6: Proposed Jones Point Berm Layout .......................................................................6-20
Figure 6-7: Interior Drainage Area for Jones Point Berm Drainage Area.................................6-22
Figure 6-8: Area of Proposed Regrading..................................................................................6-27
Figure 6-9: Jones Point Focus Area Floodproofing Options.....................................................6-37
Figure 6-10: King Street Focus Area Floodproofing Options...................................................6-40
Figure 6-11: Waterfront Focus Area Floodproofing Options ...................................................6-42
Figure 6-12: North Union Focus Area Floodproofing Options.................................................6-44
Figure 7-1: Elevated Walkway at Waterfront Park (View 1)......................................................7-3
Figure 7-2: Elevated Walkway at Waterfront Park (View 2)......................................................7-4
Figure 7-3: Elevated Walkway at Park South of Parking Lot on Strand Street...........................7-5
Figure 7-4: 10-year Flood Inundation Before and After Elevated Pedestrian Walkway.............7-6
Figure 7-5: Structures Protected by Elevated Walkway .............................................................7-7
Figure 7-6: Floodwall behind Torpedo Factory........................................................................7-10
Figure 7-7: Floodwall in Front of Chart House........................................................................7-11
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