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One thing to remember - regular storm sewers aren't treated at all and just dump into rivers all the time. One advantage of a combined system is that under light rain, all that runoff is treated at Blue Plains before entering the rivers.

So, separating storm sewers from sanitary sewers isn't a silver bullet - there's still a strong desire to reduce run-off.

That said, simply replacing all of the CSO pipes is a completely unrealistic project to be completed in any sort of reasonable timeframe. That's why we have the deep tunnel concepts.

DC Water's plans do involve separation of the sewers for some small CSO outlets:

http://www.dcwater.com/workzones/projects/pdfs/rock_creek_sewer_seperation_b.pdf

However, the long term management plan has deemed that approach unrealistic for most of the CSO area:

http://www.dcwater.com/workzones/projects/pdfs/ltcp/Control_Plan_Highlights.pdf

Page 9 of that PDF shows the areas where the sewers will be separated. The remaining areas will be addressed in other ways.

by Alex B. on Oct 8, 2010 3:13 pm • link • report

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