By Shannyn Soliven
HNN Summer Intern

HONOLULU (HawaiiNewsNow) — A three-year, $375 million project to build a gravity sewer tunnel and make other infrastructure upgrades in Windward Oahu was officially wrapped up Thursday.

The 3-mile-long tunnel is 400 feet below the surface in places, and was constructed to be able to handle “massive excess capacity,” including during major storms, Mayor Kirk Caldwell said.

“This first-of-its-kind project in the state of Hawaii allows sewage to flow by the use of gravity instead of using energy and being pumped under pressure,” Caldwell said, in a news release.

He added that a newly-built pump station has “state-of-the-art redundancy to avoid problems should there be a failure of one of the pumps. This is a project the entire community can be proud of.”

The improvements, officially known as the Kaneohe-Kailua Wastewater Conveyance and Treatment Facilities project, are aimed at preventing overflows and spills. In addition…


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