The value of camber recommended for cement concrete roads in the areas of heavy rainfall is

Concept:

Camber:

• It is the cross slope provided to raise the middle of the road surface in the transverse direction to drain off rainwater from the road surface.
• The objectives of providing camber are surface protection (especially for gravel and bituminous road), sub-grade protection, quick-drying of pavement which in turn increases safety. 
• The required value of camber is dependent on the type of pavement and rainfall.

The table below depicts the camber value for different conditions:

Hence, Recommended value of camber for cement concrete road in heavy rainfall area is 2% or 1 in 50.