SECTION 4: RISK ASSESSMENT
Table 4.37 – Population Impacted by the 100 Year Flood Event
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
1,624
0.4% 0.1% 0.5% 0.1% 0.5%
35,611
138
0.4% 0.1% 0.5% 0.1% 0.5%
30,469
118
0.4% 0.1% 0.5% 0.2% 0.5% 0.1% 0.1% 0.1%
Apex
41,724
33
3,546
3
3,034 9,907 1,819 2,253 1,875 1,345 1,356
2
Cary
136,260 25,023 30,981 25,790 18,501 18,655
624
11,579
54
45
Fuquay-Varina
37
2,126 2,633 2,192 1,572 1,585
3
3
Garner
148
13
11
Holly Springs
9
0%
1 1 2 0 2 2 3
0%
1 1 2 0 1 2 2
Knightdale Morrisville
14 23
0.1% 0.1%
0.1% 0.1%
Rolesville
5,199
0
0%
442
0%
378
0% 0%
Wake Forest
30,382
19 26 30
0.1% 0.3% 0.5%
2,582
0.1% 0.3% 0.6%
2,209
Wendell Zebulon
7,889 6,102
670 519
574 444
0.3% 0.5%
Unincorporated Wake County
135,124
140
0.1%
11,483
12
0.1%
9,825
10
0.1%
Total
900,683
2,727
0.30%
76,540
234
0.31%
65,488
198
0.30%
Source: NCEM Risk Management Tool
Property
Residential, commercial, and public buildings, as well as critical infrastructure such as transportation, water, energy, and communication systems may be damaged or destroyed by flood waters. Table 4.38 details the property at risk from the 1% annual chance flood event, according to data from the NCEM IRISK database. As with population vulnerability data, actual property at risk is likely higher due to the amount of development that has occurred since the original analysis for the IRISK dataset was performed. The damage estimates for the 1% annual chance flood event total $186,783,632, which equates to a loss ratio of less than 1 percent. The loss ratio is the damage estimate divided by the total potential exposure (i.e., total value of all buildings in the planning area), displayed as a percentage of value at risk. FEMA considers loss ratios greater than 10% to be significant and an indicator a community may have more difficulties recovering from an event. Table 4.39 provides building counts and estimated damages for Critical Infrastructure and Key Resources (CIKR) buildings across all jurisdictions, by sector and flood event. Vulnerability of CIKR as well as High Potential Loss Properties, where applicable, can be fo und by jurisdiction in each community’s annex to this plan.
Wake County Multi-Jurisdictional Hazard Mitigation Plan 2019
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