I have been working on a retrofit to an existing stormwater pond (increasing its detention time for a 1-year storm event). In the state review process, the project has been referred to the Dam Safety section, which is concerned with the pond's performance during the Probable Maximum Precipiation (PMP) event. Reviewing the data for my region, the design storm they are looking for is a 27" storm event. Plugging this storm event into my model as a 27", 24 hour storm event (predictably) overloads my pond by quite a bit (The 100-year storm event in our area is 5.2")
Has anyone else here designed stormwater ponds with the PMP in mind? Is it really on the order of 5x larger than a 100-year storm event? Have I erred in my modeling at some point?
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