Abstract
The Arrow project is located on the Columbia river in south-east British Columbia. The earth-fill cofferdam, required for the construction of the concrete structures, was completed early in 1966 and removed late in 1967. The cofferdam consisted of a sand and gravel fill with a central impervious core. The core was in two parts: the lower core consisted of a concrete cut-off wall formed by the slurry trench process; the upper core was a compacted impervious till. The cofferdam withstood a maximum hydraulic head of 115 ft.Design, construction, performance and removal of the cofferdam are described. Production rates for the concrete cut-off wall are given together with an estimate of costs.
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