SECTION 4: RISK ASSESSMENT
Table 4.46 – Population Impacted by the 500 Year Flood Event
Elderly Population At Risk
All Children Population
Children At Risk
Population At Risk
All Elderly Population
Total Population
Jurisdiction
Number Percent
Number Percent
Number Percent
Raleigh
476,892
2,688
0.6% 0.1% 0.6% 0.1% 0.5% 0.0% 0.0% 0.9% 0.0% 0.1% 0.4%
53,945
345
0.6% 0.2% 0.7% 0.2% 0.5% 0.0% 0.0% 1.0% 0.0% 0.2% 0.4%
26,904
172
0.6% 0.2% 0.7% 0.2% 0.5% 0.0% 0.1% 1.0% 0.0% 0.2% 0.5%
Apex
57,525
83
5,963
12
3,912 9,432 2,204 2,863 2,254 1,917 1,627
8
Cary
164,869 32,177 35,232 30,885 29,077 21,999 12,236 38,203
959
19,866 4,432 5,015 2,685 3,207
139
66
Fuquay-Varina
43
8
4
Garner
167
27
15
Holly Springs Knightdale Morrisville
10
1 1
1 1
8
198
1,533 1,401 4,777
16
17
Rolesville
0
0 8 6
919
0 5 2
Wake Forest
51
2,891
Wendell Zebulon
8,423 5,751
35 87
1,361
418 437
1.5%
948
13
1.4%
6
1.4%
Unincorporated Wake County
230,494
187
0.1%
29,196
40
0.1%
14,301
20
0.1%
TOTAL
1,143,763
4,516
0.4%
134,329
616
0.5%
70,079
317
0.5%
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 4.47 through Table 4.51 detail the property at risk from the 10-year through the 500-year flood event, according to data from the NCEM IRISK database. As with population vulnerability data, there are no estimated impacts in the floodway, and 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 $30,624,034, 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 4.52 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 found by jurisdiction in each community’s annex to this plan.
Wake County, NC Multi-Jurisdictional Hazard Mitigation Plan
WSP June 2024 Page 142
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