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Potomac Waterfront Flood Mitigation Study - City of Alexandria

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Refinement <strong>of</strong> <strong>Mitigation</strong> Measures<br />

specific criterion. This was to verify that the final alternatives that would be analyzed in further<br />

detail were not being subjectively selected by the process. The final score and overall rank for<br />

each flood mitigation alternative are listed in Table 2-3.<br />

Alternative<br />

ID<br />

Total<br />

Score<br />

Table 2-3: <strong>Flood</strong> <strong>Mitigation</strong> Measure Final Rankings<br />

Ranking Alternative Definition<br />

S1 500 1 Build an engineered structure to act as a barrier between the<br />

<strong>Potomac</strong> River and <strong>Alexandria</strong>.<br />

S2 499 2 Build a pedestrian boardwalk that would also be a floodwall<br />

structure.<br />

PP5 473 3 Acquire properties experiencing frequent flooding.<br />

ES5 466 4 Provide sandbags or other flood deterrents for residents and<br />

businesses.<br />

S3 439 5 Increase the inlet and road elevation to prevent overflow from<br />

nuisance flooding events.<br />

PP6 435 6 Elevate structures.<br />

PP2 396 7 Provide dry floodpro<strong>of</strong>ing with impermeable membranes and<br />

watertight shields to prevent floodwaters from entering<br />

buildings.<br />

PR2 389 8 Improve the <strong>City</strong>’s floodplain and zoning ordinances.<br />

PP3 379 9 Relocate internal supplies, products/goods, and utilities above<br />

the flooding depth.<br />

S6 376 10 Improve flapgate operation at outflow points.<br />

PP1 348 11 Provide wet floodpro<strong>of</strong>ing to make uninhabited portions <strong>of</strong><br />

structures resistant to flood damage.<br />

PR1 339 12 Add backflow preventers in homes to prevent stormwater (and<br />

sewer) backups.<br />

ES1 334 13 Isolate service so that only the buildings affected by flooding<br />

would have service turned <strong>of</strong>f.<br />

PP4 324 14 Relocate external electrical boxes.<br />

ES4 323 15 Improve the <strong>City</strong>’s emergency response.<br />

EA3 309 16 Inform business and residents about reimbursement for<br />

damages other than just exterior building damages.<br />

Do Nothing 309 16 Do nothing.<br />

ES2 303 18 Improve/enhance existing business identification system for<br />

returning to impacted area.<br />

ES3 303 18 Implement system to provide text messages, announcements,<br />

and/or phone messages regarding the status <strong>of</strong> the flooding.<br />

ES6 299 20 Provide improved cleanup program.<br />

EA1 294 21 Provide education to area media outlets about what is causing<br />

the flooding, how to avoid flooded areas, and what in<br />

<strong>Alexandria</strong> would remain open and accessible.<br />

EA2 279 22 Create maps, provide signs, and help erect barriers (that would<br />

be only as large as needed) to show visitors and residents how<br />

to navigate the streets and show what businesses and parking<br />

areas remain open.<br />

S7 254 23 Add sump pumps.<br />

28-JUL-10\\ 2-7

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