Kaneohe gravity tunnel halfway complete - Hawaii News Now - KGMB and KHNL

Kaneohe gravity tunnel halfway complete

Entrance to the gravity tunnel. Entrance to the gravity tunnel.
Inside the gravity tunnel. Inside the gravity tunnel.
Honolulu Mayor Kirk Caldwell Honolulu Mayor Kirk Caldwell
Director of the Department of Design and Construction Robert Kroning Director of the Department of Design and Construction Robert Kroning
KANEOHE, OAHU (HawaiiNewsNow) -

Honolulu Mayor Kirk Caldwell announced, on Tuesday the city's progress on a three mile gravity tunnel that will transport waste from Kaneohe to Kailua.

After nearly nine months of drilling, 1.7 miles of the tunnel beneath the Oneawa Hills is complete.

"We expect the tunnel portion to be finished in June of 2016," Director of the Department of Design and Construction, Robert Kroning said. "It's actually part of a two part project. The 2nd part is going to be building the pump station that's going to lift the sewage from about 63 feet below the surface of the earth up to the surface so that it can be treated at the plant."

The city is putting in a 10-foot-wide fiberglass pipe that is meant to last more than a century. It will also hold more sewage to prevent overflows during storms.

By design, the waste will flow naturally instead of being pressurized which will also reducing the smell of the waste.

"It's an amazing engineering feat and it think everyone at this place can be so proud that we're on the cutting edge doing something that as robert says is going to last for hundreds of years it's really really great," Mayor Caldwell said.

60 employees are working on the $320 million project which is set to be finished in 2018.

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