SECTION 4: RISK ASSESSMENT
Event Count
Property Damage
Property Damage (PV)
Crop Damage (PV)
Jurisdiction
Deaths
Injuries
Crop Damage
Cary
11
0
0
$267,500
$179,356
$0
$0
Fuquay-Varina
3
0
0
$0
$0
$0
$0
Holly Springs
4
0
0
$20,000
$14,459
$0
$0
Morrisville
4
0
0
$0
$0
$0
$0
Wake Forest
3
0
0
$0
$0
$0
$0
Zebulon
2
0
0
$70,000
$61,655
$0
$0
Unincorporated Wake County
8
4
0
$95,208,310
$71,289,655
$40,030,000
$29,973,486
Total
93
4
0
$99,052,810
$73,946,825
$40,030,000
$29,973,486
Source: NCEI
The following historical flood elevations are reported in the 2017 Revised FIS for Wake County and illustrate the potential for flooding throughout the county: July 4, 2001 – Middle Creek and Swift Creek overflowed their banks, causing extensive flooding in Holly Springs, Fuquay-Varina, and Garner. A mobile home park near Ten-Ten Road and Highway 401 was evacuated. Many roads and a few bridges were washed out, causing some people to abandon their cars. April 27, 2008 – Over three inches of rain fell between 6:45 p.m. and 11:00 p.m. with nearly 2.5 inches falling in the first hour alone. The heavy rainfall caused Marsh Creek to overflow, flooding south bound lanes of Capital Boulevard near the intersection of Brentwood Road. The softball field and walking trail in Brentwood Park also experienced flooding, with 4 to 5 feet of flowing water through the park. September 6, 2008 – During the early morning house Tropical Storm Hanna made landfall near Myrtle beach, SC and tracked north into central North Carolina along Interstate 95. Four to seven inches of rain which fell over the eastern piedmont resulted in flash flooding over large areas including the Triangle. Up to seven inches of rain caused flash flooding in many locations across Raleigh particularly along Crabtree Creek and other flood prone areas. A motorist was rescued from a vehicle after driving into a flooded underpass at Hillsborough Drive and Chapel Hill Drive in west Raleigh. Sullivan Drive between Dan Allen and Varsity Drive was closed due to flooding along with Avent Ferry Road at Trailwood Drive. Number creeks across the region flooded low lying areas as well as some vehicles. Probability of Future Occurrence By definition of the 100-year flood event, SFHAs are defined as those areas that will be inundated by the flood event having a 1-percent chance of being equaled or exceeded in any given year. Properties located in these areas have a 26 percent chance of flooding over the life of a 30-year mortgage. The 500-year flood area is defined as those areas that will be inundated by the flood event having a 0.2- percent chance of being equaled or exceeded in any given year; it is not the flood that will occur once every 500 years. While exposure to flood hazards vary across jurisdictions, all jurisdictions have at least some area of land in FEMA flood hazard areas, therefore the likelihood of flooding is considered possible (between 10% and 50% annual probability) for all jurisdictions. Additional flood risk comes from localized stormwater flooding and flash floods. Historical records indicate that an average of 7.75 flood or flash flood events occur each year in the planning area. Probability: 3 – Likely
Wake County Multi-Jurisdictional Hazard Mitigation Plan 2019
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