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Managing stormwater in cities is important to reduce flooding and secure people and property. Stormwater needs some kind of treatment before it flows to surface waters, and that treatment can be essential in older areas where stormwater and sanitary waste are collected in combined sewers. The Chicago area has built a network of underground tunnels to store that stormwater for later treatment before it goes to the river.To understand this extraordinary project we’re talking with Kevin Fitzpatrick, Managing Civil Engineer for the Metropolitan Water Reclamation District of Greater Chicago, who works on what is called the Tunnel and Reservoir Plan