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Presentation on policies promoting climate resilience in Ontario, a review of insurance industry and government agency statements on extreme weather trends, a review of national and local engineering climate datasets annual maximum series and derived IDF trends, particularly southern Ontario. A review of engineering and academic studies for multiple municipalities highlights many unsupported claims on extreme weather trends. Practical design approaches given decreasing or stationary IDF trends, and allowances for future climate changes effects are noted, including the consideration of design stress test analysis with synthetic hyetographs or rain intensity increases. Design hyetographs are shown to be more critical to infrastructure system design than IDF curve shifts in regions such as Southern Ontario.