Question

Effluent from drainage system with 8 dSm\(^{-1}\) EC is discharged in a canal water having 0.3 dS m\(^{-1}\) EC. If discharge of drainage effluent and canal water is 30 and 900 m\(^3\) h\(^{-1}\), respectively then what will be EC of downstream canal water?

• A. 4.15 dS m\(^{-1}\)
• B. 0.55 dS m\(^{-1}\)
• C. 0.3 dS m\(^{-1}\)
• D. 1.55 dS m\(^{-1}\)

Hint:

To quickly verify your answer:
Because the clean canal water flow (\(900 \text{ m}^3\text{h}^{-1}\)) is much larger than the salty drainage flow (\(30 \text{ m}^3\text{h}^{-1}\)), the final salinity must be much closer to the clean water level (\(0.3 \text{ dS/m}\)) than the salty effluent level (\(8 \text{ dS/m}\)).

Answer 1

The Correct Option is B