The researchers found a better way to predict how much water soil can hold by looking at the size of its particles and the amount of clay it contains. They used a special equation and a new method based on soil gradation to make more accurate predictions. By testing their method on different types of soil, they discovered that their approach was more precise than previous models. This improved prediction model can help estimate how soil behaves under different conditions, like when it has very little water or a lot of clay. This can be useful for understanding how soil can affect things like its strength, how water flows through it, and its stability on slopes.