Page 9 - Topographical Maps-Indroduction.pmd

Topographical Maps

VALLEY
A geomorphic feature lying between two hills or ridges and formed as a
result of the lateral erosion by a river or a glacier is called a valley.

‘V’-shaped Valley ‘U’ – shaped Valley
It resembles the letter V. A V-shaped A U–shaped valley is formed by strong
valley occurs in mountainous areas. lateral erosion of glaciers at high
The lowermost part of the V–shaped altitudes. The flat wide bottom and
valley is shown by the innermost steep sides makes it resemble the
contour line with very small gap letter ‘U’. The lowermost part of the
between its two sides and the lowest U–shaped valley is shown by the
value of the contour is assigned to it. innermost contour line with a wide
The contour value increases with gap between its two sides. The contour
uniform intervals for all other contour value increases with uniform intervals
lines outward. for all other contour lines outward.

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V-Shaped Valley U-Shaped Valley

2015-16(20/01/2015)