Soil Saturation Curves

Soil saturation curves are graphs that show how much water soil can hold at different levels of moisture. They illustrate the relationship between the amount of water added to soil and how saturated it becomes. As more water is added, soil particles fill up until they can’t hold any more—this is full saturation. The curve helps engineers and scientists understand how soils behave in different conditions, which is important for construction, agriculture, and drainage design. Essentially, it explains the capacity of soil to retain water and how it responds as it gets increasingly wet.