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Chapter: Civil Surveying - Levelling and Applications

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Uses of contours maps

Contours provide valuable information about the nature of terrain. This is very important for selection of sites, determination of catchment area of a drainage basin, to find intervisibility between stations etc.

Uses of contours maps

 

Contours provide valuable information about the nature of terrain. This is very important for selection of sites, determination of catchment area of a drainage basin, to find intervisibility between stations etc. Some of the salient uses of contours are described below

 

Nature of Ground

 

To visualize the nature of ground along a cross section of interest,

 

To Locate Route

 

Contour map provides useful information for locating a route at a given gradient such as highway, canal, sewer line etc.

 

Intervisibility between Stations

 

When the intervisibility between two points can not be ascertained by inspection of the area, it can be determined using contour map.

 

To Determine Catchment Area or Drainage Area

 

The catchment area of a river is determined by using contour map. The watershed line which indicates the drainage basin of a river passes through the ridges and saddles of the terrain around the river. Thus, it is always perpendicular to the contour lines. The catchment area contained between the watershed line and the river outlet is then measured with a planimeter

 

Storage capacity of a Reservoir

 

The storage capacity of a reservoir is determined from contour map. The contour line indicating the full reservoir level (F.R.L) is drawn on the contour map. The area enclosed between successive contours are measured by planimeter .The volume of water between F.R.L and the river bed is finally estimated by using either Trapezoidal formula or Prismoidal formula.

 

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