*Code Version
2010
*Sub Code
Building
*Chapter & Topic
Chapter 16
*Section
1612.4
Related Modifications
*Summary of Modification
Permit dry floodproofing of nonresidential buildings in flood hazard
areas identified as Coastal A Zones if designed in accordance with ASCE
24 to account for wave loads and the potential for erosion and local
scour.
*Text of Modification
1612.4.1 Modification to ASCE 24-05. Table 6-1 and Section
6.2.1 in ASCE 24 shall be modified as follows:
1. The title of Table 6.1 shall be “Minimum Elevation of
Floodproofing, Relative to Base Flood Elevation (BFE) or
Design Flood Elevation (DFE), in Coastal A Zones and in
Other Flood Hazard Areas that are Not – Outside of High
Risk Flood Hazard Areas.”
2. Section 6.2.1 shall be modified to permit dry floodproofing
in Coastal A Zones, as follows: “Dry floodproofing of
nonresidential structures and nonresidential areas of mixeduse structures shall not be allowed unless such structures
are located outside of High Risk Flood Hazard areas, and
Coastal High Hazard Areas, and Coastal A Zones. Dry
floodproofing shall be permitted in Coastal A Zones
provided wave loads and the potential for erosion and local
scour are accounted for in the design.”
RATIONALE FOR GLITCH PROPOSAL FOR CAZ AND DRY FLOODPROOFING
(a) Whether the proposed code change falls within the glitch criteria stated above,
The proposed code change is within glitch criteria permitted for inconsistencies with federal
regulations.
(b) Whether the proposed code change has a Florida specific need, and
Many reaches of Florida coast are designated as Zone V (Coastal High Hazard Area) on
FEMA Flood Insurance Rate Maps. The landward limit of Zone V is where waves predicted
to occur during the base flood fall below 3-ft in height. Inland of these areas are flood hazard
areas where conditions during the base flood develop waves between 1.5 ft and 3 ft high;
these areas are called Coastal A Zones for the purpose of designing and constructing
buildings within the scope of the 2010 Florida Building Code, Building. Over the past 30-40
years many Florida communities have, as allowed under Federal regulations for the NFIP,
permitted dry floodproofing measures to be used for nonresidential buildings located in these
areas now called Coastal A Zones. Experience has shown these measures, if properly
designed, protect against base flood conditions. The proposed code change authorizes the
continued use of dry floodproofing measures in accordance with the standard referenced by
Section 1612.4 (ASCE 24, Flood Resistant Design and Construction).
(c) What the impact is on small businesses.
This code change will allow small businesses to dry floodproof buildings in Coastal A Zones,
which increases the options available for providing the required level of protection.