Wake County Hazard Mitigation Plan - January 2020

SECTION 4: RISK ASSESSMENT

Vulnerability Assessment Methodologies and Assumptions

Population and property at risk to flooding was estimated using data from the North Carolina Emergency Management (NCEM) IRISK database, which was compiled in NCEM’s Risk Management Tool . People Earthquake events in Wake County are unlikely to produce more than mild ground shaking; therefore, injury or death is unlikely. Objects falling from shelves generally pose the greatest threat to safety. Table 4.24 and Table 4.25 detail the population estimated to be at risk from a 250-year earthquake and a 500-year earthquake, respectively, according to the NCEM IRISK database. Table 4.24 – Estimated Population Impacted by 250-Year Earthquake

Elderly Population at Risk

Total Population at Risk

All Children Population

Children at Risk

Total Population

All Elderly Population

Jurisdiction

Number Percent

Number Percent

Number Percent

Raleigh

419,053

48,654 11.60%

35,611

4,136 11.60%

30,469

3,538 11.60%

Apex

41,724

4,218 10.10%

3,546

358 10.10%

3,034 9,907 1,819 2,253 1,875 1,345 1,356

307 10.10%

Cary

136,260 25,023 30,981 25,790 18,501 18,655

12,025

8.80%

11,579

1,033

8.90%

873

8.80%

Fuquay-Varina

2,791 11.20% 4,534 14.60%

2,126 2,633 2,192 1,572 1,585

237 11.10% 385 14.60%

203 11.20% 330 14.60%

Garner

Holly Springs

2,211

8.60%

188

8.60%

161

8.60%

Knightdale Morrisville

3,307 17.90% 4,676 25.10%

281 17.90%

240 17.80% 340 25.10%

397

25%

Rolesville

5,199

834

16%

442

71 16.10%

378

61 16.10%

Wake Forest

30,382

3,726 12.30% 835 10.60% 781 12.80%

2,582

321 12.40% 71 10.60% 66 12.70%

2,209

270 12.20% 61 10.60% 57 12.80%

Wendell Zebulon

7,889 6,102

670 519

574 444

Unincorporated Wake County

135,124

22,391 16.60%

11,483

1,903 16.60%

9,825

1,628 16.60%

Total

900,683

110,983 12.32%

76,540

9,447 12.34%

65,488

8,069 12.32%

Source: NCEM Risk Management Tool

Table 4.25 – Estimated Population Impacted by 500-Year Earthquake

Elderly Population at Risk

Total Population at Risk

All Children Population

Children at Risk

Total Population

All Elderly Population

Jurisdiction

Number Percent

Number Percent

Number Percent

Raleigh

419,053 420,104 100.30%

35,611 35,714 100.30%

30,469 30,547 100.30%

Apex

41,724 41,724

100%

3,546

3,546

100% 102% 100% 100%

3,034 9,907 1,819 2,253

3,034

100%

Cary

136,260 137,544 100.90%

11,579 11,814

9,986 100.80%

Fuquay-Varina

25,023 25,023 30,981 30,981

100% 100%

2,126 2,633

2,126 2,633

1,819 2,253

100% 100%

Garner

Wake County Multi-Jurisdictional Hazard Mitigation Plan 2019

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