I think all of you engineers are missing the point.......
We have spent Billions of dollars to "Clean" up the Bay, but can't afford to fix these Sewage systems that continually "pour", not pump for you engineers, into the Bay.
Who designs these Sh!t systems and why are they not fixed?
Your trying to relate two different aspects. Sewer discharge into the Bay is only a portion (and likely a very small portion) of the impacts associated to the Bay. In reality, the overflow discharge for these storm events quickly become negligible given the amount of effluent vs the amount of volume/spread into the Bay (let alone the decomposition/transition of the actual raw material). Anyhow, the Bay cleanup has numerous parts/pieces and numerous point sources (sewers being one). Runoff/soil water management, drainage, chemical impacts, etc.
As noted in an earlier post, the cost of overhauling these sewer systems is extensive and often times cost prohibitive. Sewer lines are very often the deepest lines underground (therefore requiring the largest excavations/slowest production rates), often located in the middle of roadways (requiring extensive road closures, detours, etc.). They have high 'associated' costs such as utility relocation expenses, road rebuilding costs, etc. Point being, it's not just the cost of putting in the actual line itself. It's all the associated BS that goes with it.
Also keep in mind how the sh!t moves around. You can't just necessarily cut out and remove a section of pipe. If it's gravity, you're usually following the "section" at both ends to a point where the math/elevation works. That can be miles .............
Remember years ago when Georgetown kept having MH's catch on fire and lids blowing off? That wasn't technical error or fault equipment. That was the end result of Georgetown and it's residents refusing to allow their streets to be closed down for Pepco to conduct maintenance/replacement on its underground system. Georgetown couldn't afford the impacts to the storefronts, residents, general population, etc. Had nothing to do with the actual expense of the work.
The #### systems in place in many locales are over a hundred years old. Hell, we still find brick arch sewers. The technology and materials are far more superior now in terms of capacity, flow and isolation. It's a just matter of swapping things out. EPA/MDA is getting more involved now with issuing Consent Decrees orders against jurisdictions/areas in non-compliance - especially when they find evidence of not incorporating the upgrades within the realm of existing/proposed construction contracts (which would be disrupting the area anyhow).