The final section of Chicago’s tunnel system began operating in 2006, more than three decades after construction began. The system uses 210 kilometers (130 miles) of tunnel to store 8.7 million cubic meters (2.3 billion gallons) of water. The reservoir portion of the project is expected to be completed by 2009

The final section of Chicago's tunnel system began operating in 2006, more than three decades after construction began. The system uses 210 kilometers (130 miles) of tunnel to store 8.7 million cubic meters (2.3 billion gallons) of water. The reservoir portion of the project is expected to be completed by 2009

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