Efficiency (\( E_a = \frac{W_s}{W_n} \times 100 \)):

Where:

• \( E_a \) is the water storage efficiency, expressed as a percentage.
• \( W_s \) is the water stored in the root zone during irrigation, in cubic meters.
• \( W_n \) is the water needed in the root zone prior to irrigation, in cubic meters.