Consumptive Use Efficiency ($\xi_{cu}$):

$$\xi_{cu} = 100 \cdot \frac{W_{cu}}{W_{drz}}$$

Where:

• $\xi_{cu}$ is the consumptive use efficiency, in percentage (%).
• $W_{cu}$ is the normal consumptive use of water, in cubic meters (m³).
• $W_{drz}$ is the net amount of water depleted from the root zone, in cubic meters (m³).