Flood Insurance Terms (Florida Glossary)

🌊 Base Flood Elevation (BFE)

The elevation of the floodwater surface during a flood with a 1% chance of being equaled or exceeded in any given year. BFE is an important benchmark for floodplain management and construction requirements; it is not, by itself, the NFIP premium-rating formula under Risk Rating 2.0.

📍 Flood Zone

A designation on FEMA flood maps describing mapped flood hazards. Zone AE is a high-risk area with a determined BFE; Zone VE identifies coastal high-hazard areas; Zone X generally identifies areas outside the mapped 1% annual-chance floodplain, although flooding remains possible.

🗺️ Flood Insurance Rate Map (FIRM)

A FEMA map showing regulatory flood hazard areas, zone designations, and, where determined, BFEs and floodways. Maps support floodplain management and lender flood insurance determinations, but cannot predict every flood.

🏠 NFIP (National Flood Insurance Program)

The federal flood insurance program administered by FEMA and delivered through participating insurers and NFIP Direct. It offers standardized policy forms, subject to eligibility, limits, terms, and applicable waiting periods. NFIP premiums are calculated using Risk Rating 2.0 and other applicable rating provisions.

💼 Private Flood Insurance

Flood insurance issued by a private insurer rather than through the NFIP. Coverage limits, exclusions, pricing, waiting periods, financial strength, and underwriting vary by company. It may be less or more expensive than NFIP coverage; lender acceptance depends on applicable requirements.

📏 Elevation Certificate (EC)

A standardized FEMA form documenting a building’s elevation and other characteristics, generally completed by an authorized professional. It can support floodplain compliance, map-change requests, and, in some cases, more accurate NFIP rating information. An EC is not universally required for NFIP pricing under Risk Rating 2.0.

🧭 LOMA (Letter of Map Amendment)

An official FEMA determination, based on required elevation and other evidence, that a naturally elevated property or structure is outside the mapped Special Flood Hazard Area. A LOMA does not guarantee that a lender will waive flood insurance or that the property cannot flood.

📬 LOMR (Letter of Map Revision)

An official FEMA revision to an effective flood map or associated flood study, generally supported by updated technical data. A LOMR may revise flood zones, floodways, or BFEs; a Letter of Map Revision Based on Fill (LOMR-F) is a separate determination.

🌧️ 1% Annual Chance Flood

A flood magnitude with a 1% chance of being equaled or exceeded in any given year, commonly called the 100-year flood. It can occur more than once in a century, including in consecutive years.

🌦️ 0.2% Annual Chance Flood

A flood magnitude with a 0.2% chance of being equaled or exceeded in any given year, commonly called the 500-year flood. The term describes annual probability, not a predictable schedule.

🏚️ Substantial Damage

Under the NFIP minimum floodplain-management definition, damage of any origin for which the cost to restore a structure to its pre-damage condition equals or exceeds 50% of its market value before the damage occurred. Local rules can be stricter, and a determination may trigger compliance requirements.

🔨 Substantial Improvement

Under the NFIP minimum definition, a reconstruction, rehabilitation, addition, or other improvement whose cost equals or exceeds 50% of the structure’s market value before work begins, subject to regulatory exceptions. Local cumulative-improvement rules may also apply.

🌬️ Coastal A Zone

A coastal portion of a mapped A or AE flood hazard area exposed to waves generally between 1.5 and 3 feet during the base flood, often identified using a Limit of Moderate Wave Action (LiMWA). It is not a separate standard FEMA flood-zone designation. Applicable construction standards depend on the adopted code and local rules.

🌊 VE Zone

A mapped coastal high-hazard area exposed to storm-induced waves generally 3 feet or higher during the base flood, or other qualifying coastal hazards. Elevated, flood-resistant construction requirements apply to regulated development, subject to local codes and site conditions.

💧 Risk Rating 2.0

FEMA’s NFIP pricing methodology that evaluates property-specific flood risk using factors such as flood hazards, distance to water, first-floor height, foundation type, and building replacement cost value. The FEMA flood-zone label is not a direct rating variable, although zones still matter for floodplain management and many lender requirements.

🚪 Flood Vents

Engineered or prescriptive openings intended to allow floodwater to enter and exit certain enclosed areas below elevated buildings, helping equalize hydrostatic pressure. They must meet applicable design and installation standards; neither their presence nor a premium discount is guaranteed in every situation.

🏗️ Lowest Floor Elevation (LFE)

The elevation of a building’s lowest floor, including a basement, as defined by applicable floodplain rules. Certain properly designed enclosures used only for parking, access, or storage may be treated differently. The relevant elevation for insurance rating may differ from the lowest-floor definition used for construction compliance.

📉 Lowest Adjacent Grade (LAG)

The lowest ground elevation immediately next to a building, as documented in an Elevation Certificate or survey. It can be important in certain FEMA map amendment determinations and floodplain evaluations.

🧾 ICC Coverage (Increased Cost of Compliance)

NFIP coverage, subject to policy limits and eligibility conditions, that may help pay qualifying costs to elevate, floodproof eligible nonresidential buildings, demolish, or relocate a structure when floodplain compliance is required after qualifying flood damage. A substantial-damage finding alone does not guarantee an ICC payment.

🌪️ Storm Surge

An abnormal rise in coastal water level caused primarily by storm winds, above the predicted astronomical tide. Damage from storm-surge inundation is generally excluded by standard homeowners policies and may be covered by flood insurance, subject to the policy’s flood definition, exclusions, limits, and other terms.