SL39: Movement of Water: Basics of Soil-Water Relationships - Part III
Figure 1. Schematic diagrams indicating the determination of pressure head (h), graviational head (g), and total head (H = h|g) at different points in the soil. The reference level for determination of g is taken to coincide with the elevation of the lower tensiometer cup. In part A, because H is higher at the higher cup, downward flow of water will occur provided that the soil is permiable. In part B, no flow is indicated because H is the same at both ends.
