Layin prreatic

Manyan layin ƙasa mai cikakken ƙasa wanda ya faru wanda ya isa ya faru, ana kiranta layin phreatic.

Ayyukan matsin lamba na Hydrostat suna ƙasa da layin phreatic yayin da Atmoshheric matsa lamba sama sama da layin phreatus."Seepage Through Earthen Dams - Soil Mechanics - Civil Engineering". Wannan layin yana raba ƙoshin ƙasa mai cike da taro daga taro mara tushe. Ba layin kayan kyauta bane, amma layin da yake gudana.

Don madoman mon, layin phreatic kimanin yana ɗaukar siffar parabola.