Question

The sprinkler system is not usually suitable for heavy clay soils where the infiltration rate is less than

• A. \(4\,mm\) per hour
• B. \(6\,mm\) per hour
• C. \(8\,mm\) per hour
• D. \(10\,mm\) per hour

Hint:

Sprinkler irrigation should be used where soil can absorb water at a suitable infiltration rate.

Answer 1

The Correct Option is A

Concept:
Sprinkler irrigation applies water in the form of artificial rainfall.

Step 1: For sprinkler irrigation to work properly, water application rate should not exceed soil infiltration rate.

Step 2: Heavy clay soils have low infiltration rate.

Step 3: If infiltration rate is too low, applied water remains on the surface and causes runoff or waterlogging.

Step 4: Sprinkler irrigation is not usually suitable when infiltration rate is less than: \[ 4\,mm/hr \]

Step 5: Hence, the correct answer is \(4\,mm\) per hour. \[ \boxed{4\,mm\text{ per hour}} \]