The article presents a new model to predict how water moves through dry soil, which is important for engineering projects. The model divides water flow into two parts, bulk water, and liquid film, and accurately predicts how water moves through different types of soil. The researchers tested the model with real data and found it works better than older models. They also used the model to study how water moves through capillary barrier systems, showing that liquid film flow is important, even though it is often ignored.