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.