Question

A useful thumb rule in check basin design is that the water spread in the entire check basin should cover in how much percentage of the time required to infiltrate the net depth of irrigation water?

• A. \(50.0\%\)
• B. \(25.0\%\)
• C. \(75.0\%\)
• D. \(66.3\%\)

Hint:

Check basin design:
- Water spread time = 75% of infiltration time.
- Basin size: Determined by soil, slope, and flow rate.
- Purpose: Uniform water distribution, minimize runoff.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
This question tests knowledge of check basin design principles.

Step 2: Detailed Explanation:
In check basin irrigation design, a useful thumb rule is that:
The water spread in the entire check basin should cover about 75% of the time required to infiltrate the net depth of irrigation water.
This ensures:
- Adequate time for infiltration.
- Uniform distribution of water.
- Prevention of runoff.
- Efficient water use.
Other percentages:
- 50% (A): Too low, would cause inadequate infiltration.
- 25% (B): Too low, insufficient time.
- 66.3% (D): Not a standard thumb rule.
Thus, 75% is the thumb rule for check basin design.

Step 3: Final Answer:
Thus, the water spread should cover 75% of the time required to infiltrate the net depth.
[0.5cm]