Camber selection in regions with scanty rainfall In areas that receive very little rainfall, how should the camber (cross slope) of the road surface be chosen?

Introduction / Context:
Camber is provided to drain surface water from the pavement. Its magnitude affects vehicle operation, safety, and pavement longevity. Climatic rainfall strongly influences the appropriate camber.

Given Data / Assumptions:

• Climatic region: scanty rainfall.
• Normal traffic and bituminous or cement-concrete surfacing.
• Need to balance drainage against driver comfort and wear.

Concept / Approach:
Greater rainfall demands steeper cross slopes to expel water quickly and prevent hydroplaning or moisture damage. In contrast, scanty rainfall allows a flatter camber to minimize steering drag, tire wear, and discomfort while still providing sufficient runoff.

Step-by-Step Solution:

Verification / Alternative check:
Design charts often present bands of recommended camber values keyed to rainfall and surface type; values are lower for arid climates.

Why Other Options Are Wrong:
Nil camber impedes any drainage and can trap water. Steeper camber is unnecessary and can be uncomfortable in dry regions. Keeping the same as heavy rainfall regions is also inefficient.

Common Pitfalls:
Applying one-size-fits-all camber; not considering overtaking comfort on two-lane roads; neglecting pavement type (bituminous vs. concrete).

Final Answer:
Flatter than standard (reduced camber)