Client/Owner
American Water Works Service Company, Inc.

Project Description
The project assessed both hydraulic and structural conditions of the private-owned wastewater collection system at the East Honolulu ? Hawaii Kai. The project included wastewater flow monitoring, collection system mapping, hydraulic capacity assessment, and man-entry sewer manhole inspections. A total of 25 flow monitors and 2 rain gauges were installed between 1/1999 and 5/2000 at various locations of the collection system. Hydraulic capacity deficiencies of the trunk sewers were identified based on population scenarios (existing and future) and I/I characteristics developed from the flow monitoring program. A total of 35 sewer manholes were inspected. As a part of field investigations, wastewater conductivity was also measured at sewer manholes located within high dry weather infiltration areas. The project recommended additional flow monitoring and field investigations, such as CCTV inspections, and sewer system capital improvements.

Many potential future development areas identified by this project were developed in the past few years or are being developed now. High wastewater salinity, a result of dry weather infiltration, is a major problem for Hawaii Kai to reuse the treatment plant effluent for irrigation. Fukunaga & Associates, Inc. worked as a subconsultant to Brown & Caldwell Honolulu on this project.

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