Refers to the buried depth of groundwater, that is, the vertical depth from the surface to the groundwater level or confined water surface. The buried depth of confined water level refers to the buried depth of groundwater, that is, the vertical depth from the surface to the groundwater level or confined water surface. Groundwater buried between two aquifers is called confined water. Confined water volume is stable and water quality is good. The water level of confined water with different burial depth is different.