ANNEX J: TOWN OF ROLESVILLE
J.1.3 FLOOD Table J.2 details the acreage of the Town of Rolesville by flood zone on the effective DFIRM. Per this assessment, just over 1 percent of the Town of Rolesville falls within the mapped 1%-annual-chance floodplains. Table J.2 – Flood Zone Acreage in the Town of Rolesville Flood Zone Acreage Percent of Total (%) Zone A 0.0 0.0 Zone AE 74.5 1.6 Zone X (500-year) 2.0 0.04 Zone X Unshaded 4,438.1 98.3 Total 4,514.5 -- Source: FEMA Effective DFIRM; Wake County GIS Figure J.3 reflects the effective mapped flood hazard zones for the Town of Rolesville, and Figure J.4 displays the depth of flooding estimated to occur in these areas during the 1%-annual-chance flood. Table J.3 provides building counts and values for critical facilities by flood zone in the Town of Rolesville. Table J.3 – Critical Facilities Exposed to Flooding, Town of Rolesville
Flood Zone
Critical Facility Count
Structure Value
AE
3
$2,018,394
X
49
$50,102,172
X, 0.2 PCT ANNUAL CHANCE FLOOD HAZARD
0
$0
Total
52
$52,120,566
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 $550,000 in building related damages.
The results of the Hazus loss estimate are summarized in Table J.4. Table J.4 – HAZUS 100-Year Flood Results, Town of Rolesville
Total Buildings with Loss
Total Value (Building & Contents)
Estimated Building Damage
Estimated Content Loss
Occupancy Type
Estimated Total Damage
Loss Ratio
Agriculture
0
$0
$0
$0
$0
0%
Commercial
1
$98,000
$3,000
$20,000
$23,000
23%
Educational
0
$0
$0
$0
$0
0%
Government
0
$0
$0
$0
$0
0%
Industrial
3
$118,000
$21,000
$63,000
$84,000
71%
Religious
0
$0
$0
$0
$0
0%
Residential
19
$582,000
$294,000
$149,000
$443,000
76%
Total
23
$798,000
$318,000
$232,000
$550,000
69%
Source: FEMA Natural Hazards Risk Assessment Program
Wake County, NC Multi-Jurisdictional Hazard Mitigation Plan
WSP June 2024 Page 506
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