The contour interval normally varies inversely to the scale of the map i.e., if the scale of map is large, the contour interval is considered to be small and vice versa (Table 17.2).

Table 17.2 CI for different scales and types of Ground

SI.NO	Map Scale	Type of Terrain	CI(m)
1	Large (1:1000 or less)	Flat	0.2 to 0.5
		Rolling	0.5 to 1
		Hilly	1 to 2
2	Intermediate (1:1000 to 1: 10,000)	Flat	0.5 to 1.5
		Rolling	1.5 to 2
		Hilly	2 to 3
3	Small (1: 10,000 or more)	Flat	1 to 3
		Rolling	3 to 5
		Hilly	5 to 10

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