ANNEX H: TOWN OF KNIGHTDALE
H.1.3 FLOOD Table H.2 details the acreage of the Town of Knightdale by flood zone on the effective DFIRM. Per this assessment, over 5 percent of the Town of Knightdale falls within the mapped 1%-annual-chance floodplains. Table H.2 – FEMA Flood Hazard Areas, Town of Knightdale Flood Zone Acreage Percent of Total (%) Zone A 0.0 0.0 Zone AE 332.5 5.4 Zone X (500-year) 26.2 0.4 Zone X Unshaded 5,780.2 94.2 Total 6,138.9 -- Source: FEMA Effective DFIRM; Wake County GIS Figure H.3 reflects the effective mapped flood hazard zones for the Town of Knightdale, and Figure H.4 displays the depth of flooding estimated to occur in these areas during the 1%-annual-chance flood. Table H.3 provides building counts and values for critical facilities by flood zone in the Town of Knightdale. Table H.3 – Critical Facilities Exposed to Flooding, Town of Knightdale
Flood Zone
Critical Facility Count
Structure Value
AE
11
$96,884,156
X
100
$218,577,181
X, 0.2 PCT ANNUAL CHANCE FLOOD HAZARD
3
$30,921,975
Total
114
$346,383,312
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 $3.9 million in building related damages. The results of the Hazus loss estimate are summarized in Table H.4. Table H.4 – HAZUS 100-Year Flood Results, Town of Knightdale
Total Buildings with Loss
Total Value (Building & Contents)
Estimated Building Damage
Estimated Content Loss $107,000
Estimated Total Damage
Occupancy Type
Loss Ratio
Agriculture
4
$316,000
$34,000
$141,000
45%
Commercial
12
$1,484,000
$95,000
$311,000
$406,000
27%
Educational
1
$56,000
$2,000
$15,000
$17,000
30%
Government
0
$0
$0
$0
$0
0%
Industrial
8
$230,000
$42,000
$139,000
$181,000
79%
Religious
3
$186,000
$11,000
$86,000
$97,000
52%
Residential
33
$3,983,000
$2,075,000
$1,077,000
$3,152,000
79%
Total
61
$6,255,000
$2,259,000
$1,735,000
$3,994,000
64%
Source: FEMA Natural Hazards Risk Assessment Program
Wake County, NC Multi-Jurisdictional Hazard Mitigation Plan
WSP June 2024 Page 479
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