Recommended Gradient As per IRC
Recommended gradient as per I.R.C for plain terrain, mountainous terrain, and steep terrain:
1. Plain or Rolling Terrain
Ruling gradient:- 1 in 30 (3.3%).
Limiting gradient:- 1 in 20 (5%).
Exceptional gradient:- 1 in 15 (6.7%).
2. Mountainous Terrain
Ruling gradient:- 1 in 20 (5%).
Limiting gradient:- 1 in 16.7 (6%).
Exceptional gradient:- 1 in 14.3 (7%).
3. Steep Terrain
Ruling gradient:- 1 in 16.7 (6%).
Limiting gradient:- 1 in 14.3 (7%).
Exceptional gradient:- 1 in 12.5 (8%).
Note: The maximum gradient at hairpin bend shall be 2.5 % for mountainous and steep areas.
Read Also:
Recommended Roadway Width, Shoulder, Carriageway Width As Per I.R.C
Recommended Standards For Building line & Control line For Plain & Rolling Area