Project Overview
raSmith staff prepared a utility and paving design for N. 109th Street between Potter Road and Wisconsin Avenue as well as for Potter Road between Underwood Elementary and the Union Pacific Railroad in the city of Wauwatosa. The City wished to repave these roadways, but it had concerns about the utilities, both storm sewer and water main, being underutilized. The sags at Potter Road and 109th Street both flood during large rain events, which blocks access for emergency vehicles and affects nearby residential properties. In addition to the storm and water main design, a sanitary sewer relay, the construction of a multi-use path, and the repaving of the Oak Leaf Trail were also included as part of this project.
To evaluate the existing storm sewer system, a regional watershed study was completed for a 132-acre watershed using 1D/2D computer modeling within PCSWMM. Areas of flooding concerns were identified, while the design aimed to improve these areas as well as convey the 500-year, 24-hour rain event. The improvements consisted of a 10-foot wide by 5-foot high box culvert at the discharge point of the watershed to Underwood Creek. The box storm sewer continued upstream, transitioning to smaller sizes and eventually round pipe, totaling approximately 4,500 lineal feet.
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