Question

Random layout of drainage system is used in

• A. Surface drainage only
• B. Subsurface drainage only
• C. Both surface and subsurface drainage
• D. Neither in surface nor in subsurface drainage

Hint:

Random drainage layout $\implies$ Used in both surface and subsurface drainage to treat scattered, isolated wet depressions in undulating topography.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Agricultural drainage pipe and ditch network layouts are tailored to field topography, ranging from systematic gridiron/herringbone patterns to random layouts.

Step 2: Detailed Explanation:
Drainage layout classification:
- Systematic Layouts (Gridiron, Herringbone, Parallel): Applied in uniformly flat lands requiring continuous, uniform water table control.
- Random Layouts: Applied where topography is undulating with isolated, scattered wet depressions or potholes.
1. In surface drainage, random field ditches connect scattered low depressions to convey standing water to an outlet.
2. In subsurface drainage, random tile drain lines are laid specifically to drain isolated wet patches across a field.
Therefore, random layout is used in both surface and subsurface drainage.

Step 3: Final Answer:
Thus, random layout is used in Both surface and subsurface drainage, corresponding to option (C).