Potomac Waterfront Flood Mitigation Study - City of Alexandria
Potomac Waterfront Flood Mitigation Study - City of Alexandria
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