On a topographic map, every fifth contour is an index contour. Two consecutive index contours on a continuously rising slope are labelled 500 m and 625 m. What is the contour interval?
25 m
There are five equal contour intervals between successive index contours. \(\text{Contour interval}=\frac{625-500}{5}=25\ \mathrm{m}\).
Important Questions from Contouring
Which of the following statements are CORRECT for contour map?
1) Parallel contour shows uniform slope.
2) Very closed contour shows steep slope.
3) Very closed contour shows flat area.
4) Two contours at different elevation cut at right angle.Identify the correct statements.
i. Contour lines form sharp V-shaped curves across valley line, with the convex side of the curve towards the higher ground.
ii. Contour lines form U-shaped curves across valley line, with the convex side of the curve towards the higher ground.
iii. Contour lines form U-shaped curves across ridge line, with the concave side of the curve towards the higher ground.
iv. Contour lines form sharp U-shaped curves across ridge line, with the convex side of the curve towards the higher ground.
Contour lines cross a watershed or ridge line at _____ .
The horizontal distance between two consecutive contours is termed as
Which method is used for the preparation of a contour plan for a route survey?
