Since its founding, Chicago has had problems dealing with water. Due to it's low lying terrain, draining the city, keeping it's waterways clean, and controlling flooding have always posed massive challenges. In the 1960s, the city embarked on a massive engineering solution, the Tunnel and Reservoir Plan, AKA the Deep Tunnel Project. The project's aim is to create a secondary system of large tunnels and reservoirs that capture any overflow wastewater that the city's sewer system cannot handle. But how does this system work? Let's dive a little deeper into Chicago's Deep Tunnel Project.