Irrigation Water Conveyance and Application Methods
Subtopic: Irrigation efficiencies
Question Statement:
An irrigation water volume of $600\text{ m}^3$ is delivered to an agricultural field plot. The root zone moisture deficit requires $480\text{ m}^3$ of water, and post-irrigation soil sampling confirms that the entire $480\text{ m}^3$ was effectively stored in the crop root zone. The water application efficiency ($\eta_a = \frac{W_s}{W_f} \times 100$) expressed in percentage is ________ (answer in integer).
Answer Key:
80
Step-by-Step Solution & Explanation
Water application efficiency is given by:
$\eta_a = \frac{W_s}{W_f} \times 100$
Where:
• $W_s = 480\text{ m}^3$ (water stored in root zone)
• $W_f = 600\text{ m}^3$ (water delivered to the field)
$\eta_a = \frac{480}{600} \times 100 = 80\%$