Designed by Brown and Caldwell, an environmental engineering and construction firm, Hawaii’s largest ever wastewater system upgrade has been officially completed.
The upgrade improves Windward Oahu’s sewage collection and treatment system by connecting the Kaneohe Wastewater Pre-Treatment Facility (KWWPTF) to the Kailua Regional Wastewater Treatment Plant (KRWWTP) via a three-mile long, 10-foot diameter gravity sewer tunnel. Wastewater flows via gravity from a depth of 39-feet below ground level at the KWWPTF to a depth of 77-feet below ground at the KRWWTP. The route travels under the Oneawa Hills in order to avoid Kaneohe Bay and any sewage overflows into the environmentally sensitive public resource.
Brown and Caldwell also designed a 45 million gallons per day Tunnel Influent Pump Station to lift wastewater to the surface for treatment at KRWWTP. The project also includes a new 15 million gallons per day replacement for the existing Kailua Influent Pump Station, a generator and headworks buildings, and odor control facilities.
Because the new tunnel system conveys wastewater via gravity rather than pressure, three upstream pump stations and a three-mile long force main (all potential community overflow points) were able to be eliminated.
Related Stories
Industrial Facilities | Sep 13, 2017
TRUMPF’s ‘smart factory’ is a factory and showroom in one
The new facility is located in Hoffman Estates, Ill., not far from Chicago O’Hare International Airport.
Industrial Facilities | Aug 29, 2017
Clayco completes construction on Georgia-Pacific Distribution Center
The new facility expands on the company’s old distribution facility by over 300,000 sf.
Transportation & Parking Facilities | Aug 6, 2017
Post Panama Canal expansion, the top three U.S. ports still rule
But land constraints around the terminals are pushing asset prices and rents to new highs.
Office Buildings | Jul 27, 2017
*UPDATED* This will be the largest flight training center in Europe and the Middle East
The center will cover about 30,000 sm and feature 18 simulators.
Industrial Facilities | Jul 26, 2017
EGGER will invest $700 million to build its first U.S. manufacturing facility
The company says the new facility will create 770 jobs over the next 15 years.
Industrial Facilities | Jul 21, 2017
Ridge breaks ground on two industrial buildings at Charleston Logistics Center
The buildings will total 686,300 sf, with each building accounting for 343,150 sf.
Market Data | Apr 13, 2017
2016’s top 10 states for commercial development
Three new states creep into the top 10 while first and second place remain unchanged.
Industrial Facilities | Apr 12, 2017
Energizing the neighborhood
The Denny Substation in Seattle is designed to give local residents a reason to visit.
Industrial Facilities | Feb 21, 2017
Made in NY Campus to be a hub for film and fashion
The project looks to provide an enhanced sense of place for tenant companies and community members.
Transit Facilities | Sep 29, 2016
Greenbuild to showcase an infrastructure project for the first time
Skanska-built light-rail extension in Los Angeles achieves Envision’s highest recognition.
