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TeachMeFinance.com - explain Cutoff trench (keyway) Cutoff trench (keyway) The term 'Cutoff trench (keyway)' as it applies to the area of reclamation can be defined as ' An excavation in the foundation of an embankment dam, usually located upstream of the dam axis or centerline crest which extends to bedrock or to an impervious stratum. The excavation is backfilled with impervious material to form a cutoff and reduce percolation under the dam. See foundation trench'. Previous 5 Terms: Cut cutaneous Cutoff Cut-off grade (uranium) Cutoff Low Next 5 Terms: Cutoff Voltage Cutoff wall Cutting cutting cycle CVD About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.