A layer of hard subsoil or clay. Also called caliche.(noun)
Hard, unbroken ground.(noun)
A foundation; bedrock.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "hardpan" in a sentence
"Caliche is also known as hardpan, calcrete, kankar (in India), or duricrust."
"Some of the farmers down here tell me confidentially that "hardpan" has been found on their neighbors 'farms, but I have not talked with any one who has any on his own farm."
"Among other impediments to water reaching the roots, such as hardpan, soil compaction, soil layering, and low salt, is a condition known as water recession."