ANNEX B: CITY OF RALEIGH
Figure B.3 reflects the effective mapped flood hazard zones for the City of Raleigh, and Figure B.4 displays the depth of flooding estimated to occur in these areas during the 1%-annual-chance flood. To supplement the IRISK assessment of property at risk from the 1% annual chance flood event in Section 4 and provide a clearer picture of the current property at risk in the City of Raleigh, current parcel data was evaluated to identify parcels developed since 2010. Using GIS analysis, parcels developed after 2010 were compared to the boundaries of the 1% annual chance floodplain to identify the exposure of newly developed property to the base flood. For parcels where updated building footprints were available, the parcel was considered exposed only if the building intersected the floodplain boundary, otherwise, a parcel was considered exposed to the floodplain if any portion of the parcel was located in the floodplain This assessment does not evaluate flood impacts or provide damage estimates. However, this summary of development in or near the floodplain since 2010 provides some context to understand the degree to which the IRISK exposure and vulnerability numbers differ from current conditions. Table B.12 provides a summary by land class of parcel development located in the 1% annual chance floodplain from January 2011 to April 2019. Table B.12 – Parcels Developed 2011 or Later and Located in 100-Year Floodplain, City of Raleigh
Land Class
Number of Parcels
Sum of Building Value
Apartment
9
$197,174,867
Commercial
12
$97,896,588
EXEMPT
12
$58,671,973
Industrial
5
$5,461,158
Part Exempt
1
$541,282
Residential Less Than 10 Acres
86
$31,032,549
Grand Total
125
$390,778,417
Source: Wake County Open Data; retrieved April 8, 2019; FEMA Effective DFIRM
Table B.13 provides building counts and estimated damages for Critical Infrastructure and Key Resources (CIKR) buildings by sector and flood event in the City of Raleigh. Table B.14 provides counts and estimated damages for High Potential Loss Properties in the City of Raleigh. Table B.13 – Critical Facilities Exposed to Flooding, City of Raleigh
Sector
Event
Number of Buildings at Risk
Estimated Damages
100 Year
4
$1,433,067
Banking and Finance
Floodway
1
$48,447
100 Year
156
$156,539,970
Commercial Facilities
Floodway
45
$7,918,573
100 Year
8
$960,696
Critical Manufacturing
Floodway
3 5
$255,246 $259,852
100 Year
Government Facilities
Floodway
1
$64,062
Transportation Systems 100 Year
3
$2,003,605
100 Year
176
$161,197,190
All Categories
Floodway
50
$8,286,328
Wake County Multi-Jurisdictional Hazard Mitigation Plan 2019
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