ANNEX D: TOWN OF CARY
D.1.3 FLOOD Table D.2 details the acreage of the Town of Cary total area by flood zone on the effective DFIRM. Per this assessment, over 7 percent of the Town of Cary falls within the mapped 1%-annual-chance floodplains. Table D.2 – Flood Zone Acreage in the Town of Cary Flood Zone Acreage Percent of Total (%) Zone A 1.8 0.004 Zone AE 3,041.7 7.9 Zone X (500-year) 107.1 0.3 Zone X Unshaded 35,139.3 91.8 Total 38,289.9 -- Source: FEMA Effective DFIRM; Wake County GIS Figure D.3 reflects the effective mapped flood hazard zones for the Town of Cary, and Figure D.4 displays the depth of flooding estimated to occur in these areas during the 1%-annual-chance flood. Table D.3 provides building counts and values for critical facilities by flood zone in the Town of Cary. Table D.3 – Critical Facilities Exposed to Flooding, Town of Cary Flood Zone Critical Facility Count Structure Value AE 47 $789,469,512 X 368 $2,785,377,270 X, 0.2 PCT ANNUAL CHANCE FLOOD HAZARD 1 $5,563,943 Total 416 $3,580,410,725 Source: FEMA Effective DFIRM To supplement the IRISK assessment of property at risk from the 1% annual chance flood event, the planning team evaluated flood risk using a level one analysis in FEMA’s Hazus software. Per this analysis, a 1% annual chance flood event would cause an estimated $67,000 in building related damages. The results of the Hazus loss estimate are summarized in Table D.4. Table D.4 – HAZUS 100-Year Flood Results, Town of Cary
Total Buildings with Loss
Total Value (Building & Contents)
Estimated Building Damage
Estimated Total Damage
Occupancy Type
Estimated Content Loss
Loss Ratio
Agriculture
8
$515
$51
$170
$221
43%
Commercial
84
$58,022
$4,505
$14,139
$18,644
32%
Educational
10
$2,787
$139
$830
$969
35%
Government
3
$808
$15
$105
$120
15%
Industrial
39
$3,813
$1,088
$2,057
$3,145
82%
Religious
10
$897
$47
$352
$399
44%
Residential
193
$61,533
$28,661
$15,762
$44,423
72%
Total
347
$128,375
$34,506
$33,415
$67,921
53%
Source: FEMA Natural Hazards Risk Assessment Program
Wake County, NC Multi-Jurisdictional Hazard Mitigation Plan
WSP June 2024 Page 420
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