Question

Tile drains are usually spaced at

• A. 10-15 m
• B. 15-30 m
• C. 60-80 m
• D. 30-60 m

Hint:

Tile drain spacing: 15-30 m (average).
Closer spacing: Heavy clay soils.
Wider spacing: Sandy soils (higher permeability).
Drain depth: 1-1.5 m below ground surface.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Tile drains are subsurface drainage systems used to remove excess water from agricultural fields.

Step 2: Detailed Explanation:
Tile drain spacing depends on:
- Soil permeability
- Depth of drains
- Crop requirements
- Rainfall patterns
For most agricultural soils, tile drains are usually spaced at 15-30 m.
Other spacing ranges:
- 10-15 m (A): Used in very heavy clay soils with low permeability.
- 30-60 m (D): Used in lighter soils with good permeability.
- 60-80 m (C): Used in very permeable soils.
Thus, the typical spacing for tile drains is 15-30 m.

Step 3: Final Answer:
Thus, tile drains are usually spaced at 15-30 m.
[0.5cm]