Reliable Precipitation Data for Dimensioning Drainage of Areas and Buildings

In recent years, the issue of rainwater drainage has become particularly relevant due to increasing urbanization and climate change. The increasing frequency of extreme rainfall leads to urban flooding and infrastructure damage. These events sometimes also lead to legal consequences for designers and contractors of drainage systems. The design of these systems in Poland has encountered difficulties due to the lack of a reliable, publicly available method for determining the reliable rainfall intensity. The study aims to present the PMAXTP atlas made available by the Institute of Meteorology and Water Management – National Research Institute (IMGW-PIB) as a tool for the precise determination of the maximum rainfall characteristics for a specific duration and probability of exceedance for any location in Poland. IMGW-PIB plans to update the PMAXTP atlas every 10 years to reflect climate changes and the increasing frequency of intense rainfall. The publication also presents computational examples for applications in engineering practice. Using this tool in design practice will allow for the safe and effective design of drainage systems that will be resistant to climate change and extreme weather conditions.