I am working on a project in the UK and we are struggling to get the 1 year 24 hours rainfall. I have been told by the Environmental Agency in the UK that the software used by the classes a 1 year event as ‘commonplace’, i.e. is likely to occur each year, and so doesn’t calculate a return for it. The forecasting team normally deals with return periods of 10 years or more, with the software having a lower limit of 2 years for calculations. I understand that both 1-year-24-hour and 2-year-24-hour are required and I wonder if anyone has experience in getting this data for the UK. We are pretty confident that our site will comply with the credit requirements, but demonstration of compliance is proving complicated so any advice would be much appreciated.
Many thanks