If you build separate sanitary and storm sewers, then you don't have that problem. About a decade ago, developing a proposal for solving that problem in Kingst

If you build separate sanitary and storm sewers, then you don't have that problem. About a decade ago, developing a proposal for solving that problem in Kingston, ON was part of my first-year engineering coursework. Obviously, I was not an expert, but after some research, my conclusion was that building storage was the cheapest solution in the short term. Opportunistically separating the sewers made the most sense over the long term.