Q. If the cross slope of a terrain is 20%, according to IRC classification, it is a :

A
Plain terrain
B
Rolling terrain
C
Mountainous terrain
D
Steep terrain
Solution:

Classification of Terrains (Types of Terrain)

a)Plain Terrain:-
The area of country having cross slope varying from 0% to 10% is known as plan terrain.

b)Rolling Terrain:-
The area of country having cross slope varying from 10% to 25% is known as rolling terrain.

c)Mountainous Terrain:-
The are of country having slope varying from 25% to 60% is known as mountainous terrain.

d)Steep Terrain:-
The area of country having cross slope greater than 60% is called steep terrain.

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