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🌊 '''Flood''' is a peril defined in insurance as the temporary inundation of normally dry land by overflow of inland or tidal waters, unusual accumulation or runoff of surface waters, or mudflow caused by flooding conditions. This definition matters enormously because most standard [[Definition:Homeowners insurance | homeowners]] and [[Definition:Commercial property insurance | commercial property]] policies explicitly exclude flood damage, meaning coverage must be obtained through a separate [[Definition:Flood insurance | flood insurance]] policy — most commonly through the [[Definition:National Flood Insurance Program (NFIP) | National Flood Insurance Program (NFIP)]] in the United States or, increasingly, from [[Definition:Private flood insurance | private-market]] carriers. The precise policy language distinguishing flood from other water-related perils like burst pipes or wind-driven rain is a frequent source of [[Definition:Coverage dispute | coverage disputes]] and [[Definition:Claim | claims]] litigation.

⚙️ From an [[Definition:Underwriting | underwriting]] and [[Definition:Risk assessment | risk-assessment]] standpoint, flood is categorized by its cause and severity using tools such as [[Definition:Flood Insurance Rate Map (FIRM) | Flood Insurance Rate Maps]], hydrological models, and historical loss databases. The NFIP assigns properties to flood zones — high-risk zones (A and V), moderate-risk zones (B and X-shaded), and low-risk zones (C and X-unshaded) — which directly determine [[Definition:Premium | premium]] rates and whether a [[Definition:Mortgage lender | mortgage lender]] requires mandatory flood coverage. Private [[Definition:Insurance carrier | insurers]] entering the flood market use proprietary [[Definition:Catastrophe model | catastrophe models]] that layer elevation data, soil permeability, precipitation forecasts, and infrastructure variables to price risk at a more granular, property-specific level than the NFIP's zone-based system. These models have been central to the expansion of [[Definition:Private flood insurance | private flood insurance]], which now competes with the NFIP in many states.

🏠 Flood ranks among the most consequential perils for the insurance industry because of its catastrophic loss potential and the persistent protection gap it creates. FEMA estimates that just one inch of floodwater can cause $25,000 in damage to a home, yet a significant percentage of properties in flood-prone areas remain uninsured. This gap has regulatory, financial, and social dimensions: it burdens government disaster-relief budgets, exposes [[Definition:Mortgage-backed security | mortgage portfolios]] to uninsured collateral losses, and leaves communities struggling to recover. For carriers and [[Definition:Insurtech | insurtechs]], closing this gap represents both a market opportunity and a public-policy imperative — driving innovation in [[Definition:Parametric insurance | parametric flood products]], real-time risk scoring, and [[Definition:Embedded insurance | embedded]] purchase pathways that make buying flood coverage as seamless as clicking a checkbox at the mortgage closing table.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Flood insurance]]
* [[Definition:National Flood Insurance Program (NFIP)]]
* [[Definition:Flood Insurance Rate Map (FIRM)]]
* [[Definition:Flood exclusion]]
* [[Definition:Catastrophe model]]
* [[Definition:Private flood insurance]]
{{Div col end}}

Definition:Flood - Revision history

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