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#Whats a contour interval full

The direction of steepest slope at a point on a contour is at right angle to the contour.Irregular contours represent uneven ground.A watershed or ridge line and valley line cross the contours at right angles.Whereas in the case of depressions, lakes etc the higher figures are outside and the lower figure are inside.A set of close contours with higher figures inside and lower figures outside indicate a hill lock.Equally spaced contour represent uniform slope and contours that are well apart indicate a gentle slope.Two contour lines do not intersect or cross each other except in the case of an overhanging cliff or a cave penetrating a hillside.

A zero meter contour line represents the coastline.

When no value is present it indicates a flat terrain.

The elevations of the contours are indicated or printed close to the contour.

All the points on a contour line have the same elevation.

The difference in elevation of two points of grade contours divided by the distance between them is always a constant gradient. The lines having equal gradient along a slope are called grade contours. It is an instrument used for locating points on a given contour gradient Grade Contours : Radius of an arc required to obtain route path = Ghat Tracer : Contour Gradient :Ī line lying on the ground surface throughout and maintaining a constant inclination to the horizontal surface is termed as contour gradient. Steeper the ground, lesser is the horizontal equivalent. It is not a constant value and varies from point to point depending upon the steepness of the ground. The Horizontal distance between consecutive contours is termed as horizontal equivalent.

For Earth Works, Building Sites, Dams, City Survey = 0.5 m.

For projects such as Highways & Railways = 2.0 m.

Contour interval is inversely proportional to the scale of the map. It is desirable to have a constant contour interval throughout the map. The vertical distance between consecutive contours is termed as ‘Contour Interval’. This is the best method of representation of features such as hills, depressions, underwater etc on a two dimensional paper. When the contours are drawn underwater, they are termed as Submarine Contours, Fathoms or Bathymetric Curves. A contour line may also be defined as the intersection of a level surface with the surface of the earth. (Hint: There are 5280 feet in one mile.A Contour line may be defined as an imaginary line passing through the points of equal devotion.

#Whats a contour interval full

If a map has a scale of 1:10,000, how many real inches does one inch on the map represent? Show your work and include all units for full credit. In the valley, use a blue pencil to indicate direction water is flowing. (from, recommended at top of assignment) In the space below, draw a simple contour map showing a valley. As a rule of thumb, the V-shaped contour is pointing upstream (the opposite direction from the flow of a stream or river). All rivers flow downhill from higher to the lower elevations, perpendicular to the contour line above it. You know that you're looking at a valley bottom when contour lines are V or U-shaped.

The rule of V and U-shaped valleys: Valleys are elongated low-lying depressions usually with a river flowing through it. What is the total relief (highest elevation minus lowest elevation) of this feature? Include units.ġ0. What is the name of the feature shown in the topographic map below? 50 40 30 20 10 9. Draw your profile on the graph included below. Using the same map, construct a cross section (also called a topographic profile) along line X-Y. What is the contour interval of the map shown below? 50 20 30 40 (Elevations shown in Feet) 8.