ANNEX I: TOWN OF MORRISVILLE
I.1.3 FLOOD Table I.2 details the acreage of the Town of Morrisville by flood zone on the effective DFIRM. Per this assessment, over 7 percent of Morrisville falls within the mapped 1%-annual-chance floodplains. Table I.2 – Flood Zone Acreage, Town of Morrisville Flood Zone Acreage Percent of Total (%) Zone A 0.0 0.0 Zone AE 434.4 7.4 Zone X (500-year) 79.5 1.4 Zone X Unshaded 5,328.5 91.2 Total 5,842.4 -- Source: FEMA Effective DFIRM; Wake County GIS Figure I.3 reflects the effective mapped flood hazard zones for Town of Morrisville, and Figure I.4 displays the depth of flooding estimated to occur in these areas during the 1%-annual-chance flood. Table I.3 provides building counts and values for critical facilities by flood zone in the Town of Morrisville. Table I.3 – Critical Facilities Exposed to Flooding, Town of Morrisville Flood Zone Critical Facility Count Structure Value AE 18 $381,393,991 X 85 $763,292,550 X, 0.2 PCT ANNUAL CHANCE FLOOD HAZARD 1 $5,684,115 Total 104 $1,150,370,656 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 $47.6 million in building related damages. The results of the Hazus loss estimate are summarized in Table I.4. Table I.4 – HAZUS 100-Year Flood Results, Town of Morrisville
Total Buildings with Loss
Total Value (Building & Contents)
Estimated Building Damage
Estimated Total Damage
Occupancy Type
Estimated Content Loss
Loss Ratio
Agriculture
1
$46,000
$4,000
$16,000
$20,000
43%
Commercial
11
$7,127,000
$499,000
$1,449,000
$1,948,000
27%
Educational
2
$201,694,000
$4,313,000
$35,564,000
$39,877,000
20%
Government
1
$214,000
$3,000
$26,000
$29,000
14%
Industrial
4
$487,000
$78,000
$264,000
$342,000
70%
Religious
4
$195,000
$11,000
$81,000
$92,000
47%
Residential
14
$8,289,000
$3,390,000
$1,971,000
$5,361,000
65%
Total
37
$218,052,000
$8,298,000
$39,371,000
$47,669,000
22%
Source: FEMA Natural Hazards Risk Assessment Program
Wake County, NC Multi-Jurisdictional Hazard Mitigation Plan
WSP June 2024 Page 493
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