When the curve is to be set out over a rough ground, the method used is?
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· Two theodolite method: In this method, curves are staked out by angular measurements only.
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Laying out a curve by Two Theodolite Method
In two theodolite method, curves are staked out by angular measurements only. Accuracy attained in this method is quite high. Thus, the method is used when higher accuracy is required and when the topography is rough or field condition is difficult.
The underlying principle of this method is that the deflection angle between a tangent (at any point on a circle) and a chord is equal to the angle which the chord subtends in the alternate segment. [Rule 4 under "Fundamental Geometry of Circular Curve '" in Lesson 37
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