I'm struggling to calculate the percentile of rainfall events. I gathered over 10 years of daily precipitation data and entered all values day by day into the calculator. My concern is: should I enter days without precipitation (slightly over 50% of all daily data I gathered) into the calculator? Or should I enter only days with rainfall?
It has significant impact on the 98th percentile rainfall amount we are targeting. I calculated both variants and actually we are compliant with the stringent one, but I would like to be sure about the documentation.