Route Surveying: Let's Calculate Road RL at Chainage 164!

What is the RL of the road at chainage 164?

If the RL of the road centre line at chainage 00 is 111.824 m and there is a positive grade from chainage 00 to chainage 104 followed by a negative grade from chainage 104 to chainage 164, what is the RL at chainage 164?

Answer:

The RL of the road at chainage 164 is 122.289.

The RL at chainage 164 is calculated by considering the rise and fall along the road centre line.

The rise at chainage 104 is calculated by multiplying the positive grade and distance:
Rise = 2.943/100 × 104 × 20 = 61.0992 m

The fall from chainage 104 to chainage 164 is calculated by multiplying the negative grade and distance:
Fall = -4.219/100 × 60 × 20 = -50.634 m

Therefore, the RL at chainage 164 is determined by adding the initial RL, rise, and fall:
R.L. at chainage 164 = 111.824 + 61.0992 - 50.634 = 122.2892 ≈ 122.289 m

So, the required answer for the RL of the road at chainage 164 is 122.289.