硬こう盤ばん

noun

hardpan

Geological term for a dense, compacted layer of soil that is difficult for water or roots to penetrate.

• この地ち域いきの地ち下かには硬こう盤ばんがあり、水みずはけが悪わるい。

  There is a hardpan layer underground in this area, so drainage is poor.