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Record-breaking hydrometeorological disasters such as Hurricane Maria in 2017 have once again highlighted the severe disaster risk exacerbated by a changing climate facing Caribbean small island states. Hurricane rainfall is a key cause of flooding in many Caribbean islands. Yet, despite the projected changes in hurricane rainfall under climate change and the attribution of a climate change signal in particular hurricane rainfall events, estimates of current and future flooding associated with hurricane rainfall are limited in the Caribbean. This research outlines a method for assessing current and future flood risk estimates in the Caribbean, producing an event-based pluvial model using hydrodynamic model LISFLOOD-FP to simulate flood hazard in Puerto Rico for present day, 1.5 oC and 2oC Paris Agreement climate projections. An event set of 59,000 hurricane rainfall estimates from a synthetic hurricane …