Category: Parametric insurance · Reviewed by Al Jabbar, Broker · Specialist Risks · Last reviewed 2026-06-10
Parametric flood insurance is a class of parametric cover under which the trigger is the occurrence of flooding of defined depth or extent at a defined location, measured by river gauge data, satellite-derived inundation mapping or modelled flood outputs. In the United Kingdom it has emerged as a gap-filler to the Flood Re household scheme for commercial property and SME risks not within Flood Re’s scope, with London market pilot products from MGAs including FloodFlash and Skyline Partners.
Category: Parametric insurance Also known as: Parametric flood cover, flood index insurance, flood depth trigger Established / Coined: Modern commercial form from circa 2017; UK FloodFlash launched 2019 Related concepts: Parametric insurance, Flood Re, Trigger event parametric, Basis risk parametric
A parametric flood insurance contract pays on the measurement of a defined flood index. Common indices used in UK and London market practice include: water depth at a site-installed Internet of Things (IoT) sensor (FloodFlash model); river height at the nearest Environment Agency real-time river-level gauge; flood extent within a defined polygon derived from Sentinel-1 Synthetic Aperture Radar (SAR) satellite imagery (Copernicus Emergency Management Service); or modelled-loss output from a reference flood model (JBA, Fathom, RMS Europe Inland Flood).
The Environment Agency operates over 1,500 telemetered river-level gauges across England, with data published in real time and available under the Open Government Licence; these are the principal physical index source for UK river flood parametric.
Parametric flood is insurance under FSMA 2000 (Regulated Activities) Order 2001 where the St Christopher test ([1974] 1 WLR 99) is met and insurable interest under Marine Insurance Act 1906 s.4 is present. The Insurance Act 2015 applies to placement and policy wording, with s.11 relevant where the trigger is framed as a condition precedent. The Consumer Insurance (Disclosure and Representations) Act 2012 applies to retail consumer parametric.
The relationship with Flood Re is significant: Flood Re is the UK reinsurance pool established by the Water Act 2014 and the Flood Reinsurance (Scheme Funding and Administration) Regulations 2015, providing a backstop for household flood risk only. Commercial property, SME and certain household sub-classes (leasehold blocks, buy-to-let, post-2009 build) are outside Flood Re; parametric products fill the gap. The EIOPA Discussion Paper on parametric insurance (June 2023) specifically discusses flood parametric as a retail consumer use case with attendant Consumer Duty considerations.
The London market parametric flood architecture has two principal forms. The sensor-based form (FloodFlash) installs a water-depth sensor at the insured property; flooding to a contractually specified depth (e.g. 30 cm) triggers payment of a pre-agreed sum (e.g. GBP 100,000), typically within seven days. The satellite/gauge form uses Sentinel-1 SAR imagery or Environment Agency gauge data to determine that flood of defined extent has occurred within the policyholder’s polygon.
For UK SME and commercial property, parametric flood is often combined with traditional indemnity property cover: parametric provides immediate liquidity (cash within 7-14 days) while indemnity responds to adjusted losses over the longer term. This hybrid mitigates basis risk.
Variations include flat-trigger contracts (binary pay/no pay), tiered triggers (different payouts at different depths), and multi-peril contracts combining flood with windstorm. Post-2020 the UK Climate Change Committee’s adaptation reports have highlighted parametric flood as a tool for SME resilience. The FCA Innovation Hub has supported retail flood parametric propositions through the Regulatory Sandbox.
A small UK manufacturer in Yorkshire purchases a parametric flood policy from a UK-authorised MGA. A water-depth sensor is installed at the factory loading bay. A trigger of 30 cm pays GBP 200,000 within 10 days; 60 cm pays GBP 400,000. The MGA is a Lloyd’s coverholder and the slip is reinsured into a Lloyd’s syndicate. The broker’s demands and needs statement records that the parametric cover sits alongside a traditional property indemnity policy and is intended to provide rapid cash for business continuity.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-10. Next review: 2026-12-10.
Apex Insurance Brokers Limited. Authorised and regulated by the Financial Conduct Authority, FRN 724952. Registered in England and Wales, Companies House 07014570. This entry provides general information about UK insurance concepts and is not regulated advice. Consult your insurance broker on your specific position.
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