# Which Instrument Is Used For Establishing Grade Contour?

## What is the space between contour lines called?

The space between the contour lines is called the contour interval and represents a specific (set) distance.

If the contour interval is 50 feet, the vertical space between the two contour lines is 50 feet..

## What are the features of contour lines?

Other characteristics of contour lines are: – Uniform slopes have uniformly spaced lines. – Along plane surfaces, contour lines are straight and parallel. – Contour lines are perpendicular to lines of steepest slopes. – For summits or depressions, contour lines most close upon themselves.

## Which method is suitable for contouring of hilly areas?

Tacheometric methodSolution: Tacheometric method: This is practically suitable for hilly areas and at places where plane tabling is impractical. This discussion on Which of the following methods of contouring is most suitable for a hilly terrain?

## How do you contour a survey?

In this method, the contours to be located are directly traced out in the ground by locating and making a number of points on each contour. These points are then surveyed and plotted on plan and the contours drawn through them.

## What are the 5 Rules of contour lines?

Rule 1 – every point of a contour line has the same elevation. Rule 2 – contour lines separate uphill from downhill. Rule 3 – contour lines do not touch or cross each other except at a cliff. Rule 4 – every 5th contour line is darker in color.

## How many methods of contouring are present?

two methodsThere are two methods of contour surveying: Direct method. Indirect method.

## What is the term used for an imaginary line on the ground joining points of equal elevation?

Explanation: A Contour is an imaginary line on the ground joining the points of equal elevation. It is a line in which the surface of the ground is interested in a level surface. … A Contour line is a line on the map representing a contour.

## What is the importance of contour lines?

The purpose of contour lines is to represent the tridimensional shape of the terrestrial surface on a bidimensional map. Contour lines are the intersection of an horizontal plane parallel to the reference level and the topographical surface to describe. Consequently: Contour lines are always closed curves.

## What are the different methods of contouring?

Methods of Contouring Direct Method • In the direct method of contouring, the reduced level of various selected points on a contour line are obtained and their positions are located. The contours are then drawn by joining these points. It is a very accurate method but it is slow and tedious.

## What is contour line method?

Contour lines are curved, straight or a mixture of both lines on a map describing the intersection of a real or hypothetical surface with one or more horizontal planes. The configuration of these contours allows map readers to infer the relative gradient of a parameter and estimate that parameter at specific places.

## What are 3 types of contour lines?

There are 3 kinds of contour lines you’ll see on a map: intermediate, index, and supplementary.Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. … Intermediate lines are the thinner, more common, lines between the index lines.More items…

## What are the uses of contours?

Uses of contours mapsUses of contours maps. Contours provide valuable information about the nature of terrain. … Nature of Ground. To visualize the nature of ground along a cross section of interest,To Locate Route. … Intervisibility between Stations. … To Determine Catchment Area or Drainage Area. … Storage capacity of a Reservoir.

## What is the shape of contour lines in case of a valley?

What is the shape of contour lines in case of a valley? Explanation: Contour lines cross a valley line at right angles. They form sharp curves of V shape across it with the convex side of the curve towards the higher ground.

## Why do we need contours?

Teaching points: Maps are flat unlike some of the ground which they represent so we use contour lines on a map to show how high the ground is. … Contour lines show all the places that are the same height above sea level. They also tell us about the slope of the land. On a steep slope, the lines are close together.