The Flood and Coastal Erosion Risk Management Research and Development Programme published a report for FRS19222 Improving Probable Maximum Precipitation and Probable Maximum Flood for Reservoir Safety on GOV.UK here.

The research reviewed the methods used to estimate probable maximum rainfall and flows for reservoir safety. The report describes the first phase of a project that aims to assess the suitability of methods for estimating PMP and PMF.  Accompanying the report, is a spreadsheet tool that applies the current PMP and PMF methods, including calculating snowmelt.