Back in 2003, the District of Columbia Water and Sewer Authority proposed building three tunnels to help manage sewer overflows. It now proposes suspending construction of the tunnels in favor of doing an eight-year study on green infrastructure to see if there are more sustainable options to deal with the problem. "At the end of that analysis, we will make a recommendation to the Environmental Protection Agency to do [an] all-green, all-tunnel or some hybrid program," said Pamela Mooring, the authority's external communications manager.

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