格架

zài shù liàng shàng jì bù dǎo shuǐ yě bù cún shuǐ de yán tǐ gé jià chēng wéi gé shuǐ céng

在数量上既不导水也不存水的岩体格架称为隔水层。

A mass of rock matrix which neither transmits nor stores water in significant quantities is called an "aquifuge".