cutoff trench

cutoff trench

[′kət‚ȯf ‚trench]
(civil engineering)
A trench which is below the foundation base line of a dam or other structure and is filled with an impervious material, such as clay or concrete, to form a watertight barrier.
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References in periodicals archive ?
Including earth work, piddle trench, cutoff trench, puddle filling, filter and rock toe, pitching and construction of spill channel, earth work from r.
4 million square foot slurry cutoff wall and an approximate 2,600 foot long open-cut cutoff trench through the foundation of the upstream tow of the Twin Buttes Dam to reduce foundation seepage.