According to RTU Syllabus

SURVEYING-II

CURVE SURVEYING

Part-6

Degree of Curve

•  The sharpness of the curve is designated by the radius of the curve and by the degree of curvature

• There are two different definitions of degree of curvature:

(i) Arc Definition

(ii) Chord Definition.

• According to arc definition degree of curvature is defined as angle in degrees subtended by an arc of standard length.
•  This definition is generally used in highway practice.
• The length of standard arc used in FPS was 100 ft.
• In SI it is taken as 30 m.
• Some people take it as 20 m also.

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• According to chord definition degree of curvature is defined as angle in degrees subtended by a chord of standard length.
• This definition is commonly used in railways.
• Earlier standard chord length used was 100 ft.
• Now in SI 30 m or 20 m is used as standard chord length.

Chord Definition: Let Dc be degree of curve as per chord definition and s be the standard length of chord.

Methods of setting out of simple circular curves

ADITI SHARMA