Explain four uses of contour map.
Following are uses of contour map:
i To draw longitudinal section and plan of given map.
ii To determine inter-visibility between two points.
iii To trace contour gradient and to locate route for alignments of railways, roadways, canals etc.
iv To measurement of drainage areas.
v. To calculate reservoir capacity.
vi To find intersection of surfaces and measurement of earth work.
vii To determine nature of ground in proposed area.