How far will an inch (25 millimetres) of water move into a soil profile?
Several concepts need to be discussed to understand how to calculate the depth of water infiltration. Soil porosity is the percentage of a given volume of soil that is made up of pore spaces. Soils are oven-dried to measure bulk density, so porosity is a measure of air-filled pore space. Bulk density is the apparent density of a soil, measured by determining the oven-dry mass of soil per unit volume. The volume of soil is determined using sampling cores and is measured before soil is oven-dried to avoid any changes in volume due to drying. Bulk density is usually expressed in g/cm3 or Mg/m3. Table 3.
