Irrigation Water Conveyance and Application Methods
Subtopic: Irrigation efficiencies
Question Statement:
A steady water stream of $100\text{ L/s}$ is diverted from a canal outlet into an unlined field channel. The stream discharge measured at the entrance of the agricultural field is $80\text{ L/s}$. The water conveyance efficiency ($\eta_c$) of the channel expressed in percentage is ________ (answer in integer).
Answer Key:
80
Step-by-Step Solution & Explanation
Water conveyance efficiency is defined as:
$\eta_c = \frac{W_f}{W_d} \times 100$
Where:
• $W_f = 80\text{ L/s}$ (water delivered to the field plot)
• $W_d = 100\text{ L/s}$ (water diverted from the source/canal)
$\eta_c = \frac{80}{100} \times 100 = 80\%$