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April 28, 2016

Public works: Infrastructure

Photo courtesy of WACA
Overlake Village’s south detention vault sits beneath a parking lot.

Overlake Village south detention vault

Location: Redmond

Owner/developer: City of Redmond

Team: Goodfellow Bros., general contractor; Franklin Pacific Construction, concrete contractor; Otak, architect; HDR Engineering, structural engineer; CalPortland, ready-mix supplier

Overlake Village is home to the largest stormwater detention vault in Washington following the completion of the south detention vault last year.

The 6.5 million-gallon vault is 533 feet long and 123 feet wide — bigger than a football field — and has an average clear height of 17 feet.

The structural system is made of cast-in-place concrete floor foundation slab, concrete perimeter and separation walls, columns, beams, precast hollow-core slabs, and CIP topping slab.

Several construction alternatives were evaluated by the design team and the client. The city of Redmond decided on two cast-in-place concrete rectangular cells for many reasons, including leakage and seismic design.

The substructure is buried approximately 4 feet below grade, beneath a parking lot that will later be converted to a plaza.

Some of the major challenges for the project included the constrained site, permanent structural support system, concrete shrinkage and leakage control, and settlements and differential settlements during and after construction.

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