KAI Hawaii understands utilities. Our work encompasses the consultation and design for the development, sustainability and maintenance of water storage and distribution facilities, waste water facilities, electrical distribution facilities, and telecommunications facilities. We are familiar with the unique challenges of our public utility companies and have successfully engineered effective solutions for their needs.
View some of our Infrastructure Projects
The Waikamoi Flume carries potable water over a 1.1 mile distance through the Koolau Forest Reserve on Mount Haleakala providing water to residents in Upper Kula in Upcountry Maui. Originally constructed out of redwood over a hundred years ago, the flume has experienced frequent leaks, blowouts, and foundation issues resulting in constant repair work by maintenance workers under hazardous conditions. Faced with Maui County’s goal to restore a dependable clean water supply to the people of Upcountry Maui, the Department of Water Supply contracted KAI Hawaii, Inc. to design a new flume system that could meet the capacity needed and be safely maintained.
Dangerous conditions and lack of infrastructure severely limited access to the flume by the contractor. Materials and equipment had to either be carried by hand or air-lifted in and out, limiting many design, material and construction options.
However, creative use of aluminum for the entire structure provided excellent corrosion resistance and significantly reduced the weight of the individual components, reducing the overall cost of the project.
Historically, the Hawaiian referred to this region as Wao Akua, a remote mountain area only inhabited by spirits. The region is only used as a watershed and access to the area is limited to trained professionals to protect the native plants and to control invasive species and animals. During construction, the contractor followed strict protocols in the watershed and set up a vehicle and equipment decontamination station to avoid inadvertent transportation of invasive plant species into the conservation area.
This project won several awards:
ASCE Hawaii – 2015 Outstanding Civil Engineering Achievement Awards – Best Large Project Award (Construction > $10 million)
ACECH – 2016 ACECH Engineering Excellence
- Grand Conceptor Award
- People’s Choice Award
Scope: New 210′ wide by 300′ long pier extension to support the new cruise ship and barges. The harbor was dredged to minus 35 feet MSL and a steel sheet pile bulkhead installed to support structural fill required. A new suspended concrete beam and slab deck supported on concrete piles (110 feet long) was provided to support a 1,000 psf uniform live load and Hyster Challenger 920 of 250 kips.
Scope: The project includes the design of a granular activated charcoal water filtering system and support facility for the Honolulu Board of Water Supply. There are a total of 24 GAC filter tanks with associated inlet and outlet piping from 12” to 36” diameter. An elevated platform was designed to provide access to control valving and to each GAC tank. A 50,000 gallon concrete backwash tank was designed for the purpose of providing a means of periodically cleaning the granular charcoal. A control building was designed as a concrete masonry block structure with a cast-in-place concrete roof. The control building contains all electrical and mechanical equipment and instrumentation for controlling the operation of the GAC facility. Miscellaneous structures were also designed, such as an extensive slab-on-grade that is used to provide support for the 24 GAC tanks, as well as the many piping pedestals, access platforms and other mechanical equipment.
Scope: The structural design, coordination and construction phase services for a circular internally prestressed concrete reservoir built on grade. The roof structure is a concrete two-way, cast-in-place slab supported on concrete columns. The reservoir tank foundation uses a continuous spread footing under the tank wall and pad footings for the columns located on top of the floor slab. Due to the 185-foot diameter of the tank, a special unidirectional wall joint was designed and detailed at the top and bottom joints to allow for the movement of the wall during operation.
Scope: Prime Consultant to perform all engineering/architectural services required in connection with the planning, design, preparation of plans and specifications, cost estimates and permits for the installation of a 2.0 MG storage reservoir, and 20-inch influent-effluent main, landscaping, telemetry system, A.C. access and perimeter road, irrigation system, drain line and approximately 7,500 linear feet of 20-inch transmission main and appurtenances.
Scope: Structural Engineering Services: stabilization design and rockfall protection project for the steep embankments along Kailua Road approaching Kailua Town from the Pali Highway. The rockfall protection included the design of concrete foundations for the rockfall barrier fence columns. The foundations were designed to include rock anchors for overturning. The embankment stabilization included the design of a series of retaining walls of various heights. A drainage cutoff channel was designed to be integral with the walls. Energy dissipators were included in the cutoff channels with steep slopes.
This project won the 2008 Renaissance Building and Remodeling Award – Public Works/Disaster Emergency Construction Repair $2,000,001 to $10,000,000 category.
Scope: Conduct the research to specify a new fendering system for the 850’ long Pier 3 at Nawiliwili Harbor on Kauai. The design criteria for the new fender system required that the new system would be able to protect the pier structure from barge impact as well as cruise ship impact.