cvg - Thanks for your response. I have talked with several agencies, including the agency reviewer, and they did not suggest any accepted calculation methods for this situation. This is part of my investigation to determine what others have done in the past instead of dreaming up a reduction...
I am designing stormwater detention structures for a site with extensive carbonate geology. It is evident because runoff from the entire 220+ acre drainage area passes through an existing 15" pipe without problem. There are also some sinkholes on the site. The problem I have is accounting for...
