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VTU-SYLLABUS-2010SURVEYING--I-COMMON-TO-CVTREVCTM-10CV34-->View question

## Explain the characteristics of contours June-July-2013?

->Characteristics of Contour Lines

->explain with suitable diagrams

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Characteristics of Contour Lines
Features of contour lines are helpful in plotting and interpretat
ion of several features in the map.
These characteristics are as given below:
(a) Contour line is a line joining points of similar elevation; hence all points of contour lines have
similar elevation. The elevation of a contour is written close to the conto
ur.
(b) Two contour lines of several elevations cannot intersect every other except in case of an

overhanging cliff or a cave (Figure ) refer text book

SURVEYING
-
1
10CV34
Dept
.
of Civil Eng
g
,
,
SJBIT
Page
35
of
41
Vertical
cliff
(d) Horizontal equivalent of contours denotes the topography of the area. The uniformly spaced
contour lines imply a uniform slope, although straight and equally spaced contour line denotes a
plane surface. Contour lines closed together de
note steep slope, although a gentle slope is indicated
while contour lines are far apart.
(e)
A contour line cannot end anywhere and must close upon itself, through not necessarily
inside the limits of the map.
(f)
A set of close contours along wi
th higher figures outside and lower figures inside denotes a
depression or lake, although a set of close contours along with higher figures within and lower
figures outside indicate a hillock

(g)
Contour lines cross a wat
er shed (or ridge line) and a valley line at right angles. In that case
of ridge line, they form curves of U
-
shape across it along with concave side of the curve towards
higher ground, while in case of valley line, they form sharp curves of V
-
shape across
it within
convex side of curve towards higher ground.
( for diagrams refer text book)

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