North 27th Street Inline Sewer System Tunnel Milwaukee, Wisconsin Project reduces overflows, experience surmounts challenges • Analysis reviews alternatives, zeros in on best solution • Pre-work manages perceptions, prepares for variables • Expertise leads to successful completion HNTB provided design and construction services for Milwaukee’s North 27th Street Inline Storage System extension, which reduces sewer overflows. The team’s engineering analysis included hydraulic modeling of the geographic area, and identification of all potential alternatives — near-surface storage, satellite treatment facilities or tunnel storage. The final alternative — a two-mile-long deep storage tunnel — takes hydraulics, geotechnical issues, site constraints and cost into account. Drawing on

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