Depth of Water ($d = \frac{P_v \cdot D_{rz}}{100}$ or $d = \frac{P_w \cdot A_s \cdot D_{rz}}{100}$):

Where:

• $d$ is the depth of water, in mm.
• $P_v$ is the moisture content by volume, in %.
• $P_w$ is the moisture content by weight, in %.
• $A_s$ is the apparent specific gravity.
• $D_{rz}$ is the depth of the root zone, in mm.