The new sewer is part of a plan to direct separated storm water (that is, it doesn’t have sewage in it) both from Elberon and Quail Street (where the city recently installed permeable pavement that allows storm water to sink through it) and direct it into Washington Park Lake. The water department will be able to manage the level of the lake so that it can use the body of water as another buffer for the sewer system, reducing the strain on the system during large rainfall event.