Hi! I used statistics tool in SWMM5 and got the results as following, but I'm not clear what "exceedance frequency" means here? In addition, why is start data not in order? I mean 211, 2012 and 2013. It appears randomly.
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the table is sorted by the return period but you can copy the table and sort it in Excel if you want to have the table ordered by date. The exceedance interval is the reciprocal of the return period, it tells you how often that statistic was exceeded during the simulation.