Business Consequences of Aging Sewage and Drainage Systems
On most days, Chicago’s most consequential infrastructure is invisible. Tourists gaze up at steel and glass. Developers track cranes. Executives debate tax policy and labor costs. But 350 feet below the city’s streets runs an engineered labyrinth — one of the largest civil works projects in American history — quietly determining whether basements flood, rivers reverse, and businesses remain insurable. Chicago’s Tunnel and Reservoir Plan, more commonly known as TARP or the “Deep Tunnel,” was conceived in the 1970s after decades of catastrophic flooding and sewage overflows. The idea was audacious: carve out miles of massive tunnels beneath the metropolitan area to temporarily store stormwater and wastewater during heavy rains, preventing raw sewage from pouring into the Chicago River and Lake Michigan. It was a moonshot of municipal engineering. It was also, in many ways, a bet on a different climate. Today, as extreme rainfall events intensify and development continues to pave ove...