An infographic highlighting how the technical guide CSA PLUS 4013:19 helps provide more accurate rainfall dataCSA Group Technical Guide CSA PLUS 4013:19, Development, interpretation, and use of rainfall intensity-duration-frequency (IDF) information: Guideline for Canadian water resources practitioners, aims to help address the need for better data in water system planning. The guide helps users understand the derivation of IDF data that describe the frequency of extreme rainfall events of various rates and durations, and how to apply them in planning and design of water systems, considering the changing climate.