Correct Answer - Option 4 : Neither i nor ii
Explanation:
Contour maps are used for:
i. Calculating the water capacity of reservoirs.
ii. Determining the catchment area of the drainage basin
But in Question cannot be written that's why neither i nor ii is the correct answer as for both it is used.
- Contours are the most accurate method of representing relief features.
- Contouring is an act of using contour lines when representing the relief of an area on the map.
- Contour lines are the lines drawn on the map connecting all points on the earth’s surface with equal elevations above a fixed datum line (usually the mean sea level).
- They are numbered in either feet or meters, above sea level. Usually, these numbers represent the exact elevation of land above sea level for all points along that line.
- Contour lines never cross or intersect each other.
- The spacing or gap between the contour lines represents the degree of slope.
- Contour lines lie perpendicular to streams and rivers.
Some of the salient uses of contours are described below
1. Nature of Ground
2. To Locate Route
3. Intervisibility between Stations
4. To Determine Catchment Area or Drainage Area
5. Storage capacity of a Reservoir
