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TeachMeFinance.com - explain Core (impervious core or impervious zone) Core (impervious core or impervious zone) The term 'Core (impervious core or impervious zone)' as it applies to the area of reclamation can be defined as ' A zone of low permeability material in an embankment dam. Sometimes referred to as 'central core,' 'inclined core,' 'puddle clay core,' and 'rolled clay core.' A cylindrical piece of an underground formation cut and raised by a rotary drill with a hollow bit. '. Previous 5 Terms: cordate cordiform Corduroy cordwood Core Next 5 Terms: Core damage frequency Core drill Core melt accident Core Punch Core wall 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.