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 ?
2 miles long and 90 feet tall at its highest point with a soil bentonite cutoff trench in the foundation and the upstream face of the dam protected by soil cement.
Including earth work, piddle trench, cutoff trench, puddle filling, filter and rock toe, pitching and construction of spill channel, earth work from r.