The soil or rock below the top of the water table. By definition, the saturation zone is saturated with water. See also water table. When raw sewage leaks from a sewer pipe, the area of soil that is wet around the leak is often referred to as the saturation zone.
Saturation zone, saturated zone) is the area in an aquifer below the water table where all pores, fractures and cavities (including karst cavities) are filled with water..p>
Below the water table is the saturated zone, where water fills all the spaces between sediments. The saturated zone is bounded below by impenetrable rock. The shape and height of the water table are influenced by the overlying land surface; it curves under hills and falls under valleys.
Maximum corrosion occurs between the two extremes of soil moisture content. The saturation zone is also called the phreatic zone.
Safeopedia explains saturation zones
Saturation occurs when the small pores and fissures in rock and soil beneath the earth’s surface are filled with water and occur below the water table. The saturated soil is less corrosive than material above the saturation level.
What is the saturation zone? Area where water fills all open spaces in sediment and rock (this is where groundwater resides!)
Beaches and coasts, for example, have saturation zones that are very close to the surface. The water table can also be higher or lower depending on where the top of the saturation zone is. Groundwater levels can rise or fall due to natural events such as heavy rain, drought and flooding.
SATURATION ZONE: The area of a water-bearing formation in which all interstices between soil particles and rock structure are filled with water. AERATION ZONE: The area of a bounded aquifer above the water table where the pore spaces between soil particles and rock formations are filled with air.
When the entire area below ground is saturated, flooding occurs because all subsequent precipitation is forced to stay on the surface. The amount of water that can be held in the soil is called “porosity”.
Water seeping through the soil can eventually fill any voids to the point where the soil is completely saturated. The upper surface of this saturation zone is called the water table. The saturated zone below the water table is called the aquifer. Aquifers are huge groundwater reservoirs.