SECTION 4: RISK ASSESSMENT
Category
Consequences
Property, Facilities and Infrastructure
Buildings and infrastructure, including transportation and utility infrastructure, may be damaged or destroyed. Impacts are expected to be localized to the area of the incident. Severe damage is possible. Chemicals and other hazardous substances may contaminate local water bodies. Wildlife and livestock deaths possible. The localized impact is expected to be severe for incident areas and moderate to light for other areas affected by the flood or HazMat spills. Local economy and finances will be adversely affected, possibly for an extended period of time. During floods (especially flash floods), roads, bridges, farms, houses and automobiles are destroyed. Additionally, the local government must deploy firemen, police and other emergency response personnel and equipment to help the affected area. It may take years for the affected communities to be re-built and business to return to normal. Ability to respond and recover may be questioned and challenged if planning, response, and recovery are not timely and effective.
Environment
Economic Condition of the Jurisdiction
Public Confidence in the Jurisdiction’s Governance
HAZARD SUMMARY BY JURISDICTION The following table summarizes flood hazard risk by jurisdiction. To account for increased risk of flood due to stormwater and flash flooding, communities with between 2 and 12 flash flood events in the period from 2007-2023 were assigned a probability rating of 3, and communities with over 12 flash flood events during this period were assigned a probability rating of 4. Communities with 10% or more of their land area in the SFHA were assigned a spatial extent of 3. All other factors do not vary by jurisdiction.
Spatial Extent
Warning Time
Jurisdiction
Probability
Impact
Duration
Score
Priority
Wake County
4 3 3 3 2 3 2 4 4 2 3 2 3
3 3 3 3 3 3 3 3 3 3 3 3 3
3 2 2 2 2 2 2 2 2 2 2 2 2
3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3
3.3 2.8 2.8 2.8 2.5 2.8 2.5
H M M M M M M H H M M M M
Apex Cary
Fuquay-Varina
Garner
Holly Springs Knightdale
Morrisville
3.1 3.1
Raleigh
Rolesville
2.5 2.8 2.5 2.8
Wake Forest
Wendell Zebulon
Wake County, NC Multi-Jurisdictional Hazard Mitigation Plan
WSP June 2024 Page 157
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