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Black & Veatch announced that the company has received notice to proceed with study and preliminary design of a solution to reduce combined sewer overflows (CSOs) and mitigate surface flooding within the Harlem and Baden watersheds.
Under contract to the Metropolitan St. Louis Sewer District, Black & Veatch will provide various study and engineering services for a proposed tunnel that will intercept stormwater runoff to relieve overloaded combined sewers and ultimately discharge stormwater directly to the Mississippi River.
"We selected the Black & Veatch team because that team demonstrated not only a clear understanding of local issues but also broad expertise in the areas of CSO control, tunneling and flood management," said Metropolitan St. Louis Sewer District director of engineering Brian Hoelscher. "The Harlem- Baden project will be the district’s most visible project in the next decade, limiting chronic street flooding in north St. Louis and leading to a reduction of some of the city’s most significant combined sewer overflows to the Mississippi River."
The project involves more than 100 individual drainage areas that comprise a 9,600-acre urban project area. The outcome of the project will be selection of preferred alignment and preliminary design of a major deep-rock tunnel, approximately 5 to 10 miles in length and 10 to 20 ft in diameter, and associated shafts to deliver stormwater to a new Mississippi River outlet works.