A lot has been said and written about climate change and how it may make floods more frequent and extreme. In this talk, Dr. Ashish Sharma (Professor & Future Fellow, Civil & Environmental Engineering, University of New South Wales) outlines what needs to change in a warmer climate for design floods to increase or decrease, presents data based on evidence (as opposed to model based) for all the changes to date, and suggestss what he feels is a sensible way design flood estimation should be approached in this new climate we are in. Specifically, Dr. Sharma shows evidence for clear changes in the spatial and temporal patterns associated with extreme storms, along with an increase in design intensities for shorter duration events. These changes present the clearest evidence to date that design flood magnitudes for urban catchments across the world are increasing, a change that urgently needs to be accepted and factored into our planning guidelines given the implications to our existing storm water infrastructure and society in general.