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).