Spanish verb endings present past8/15/2023 Moreover, topographical surveyors in Edmond know how to do it. They’re useful because they illustrate the shape of the land surface-its topography. Contour lines show elevation and the shape of the terrain. Contour LinesĬontour lines are lines drawn on a map connecting points of equal elevation, meaning if you physically followed a contour line, elevation would remain constant. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing. Index contours are bold or thicker lines that appear at every fifth contour line. Contour IntervalĪ contour interval is a vertical distance or difference in elevation between contour lines. You find the contour interval for your map in its legend. At some point along that line, its exact elevation is listed. Index contour lines: Every fifth contour line is a thicker, “index” line. Studying a topo map of a familiar area is a great way to learn how to match terrain features with the contour lines on a map. There are three ways of the Indirect methodĪlso Read: What Is the Well Point System? | Types of Well Point System | Advantages & Disadvantages of Well Point System In this way, relative heights are determined by level machine keeping staff at different points. With less effort from an INDIRECT METHOD,Ĭontour lines can be drawn on the map. This method is faster and cheaper than the direct method. Thus marking the different points with a 1.40 mt reader on the ground and connecting them becomes a contour line with 100 mt R.L.Īlso Read: What is Tributary Area? | Tributary Area in Column | How to Calculate Tributary Areas 2. So that the staff reading of each point on the 100 mt contour line is 1.4 mt. We now have to draw a ground contour line of 100 mt. Suppose the benchmark is R.L 100 mt, and It comes with a reading of 1.40 mt. In this method, the level machine is fixed in the center, then the machine’s leveling is done than reading is done on the benchmark first. In this method, the points connecting the points of equal height are drawn using a dumpy level machine. To determine the alignment of water lines and sewer lines.To determine the alignment of city roads.To determine the boundary of state and municipality.Topographical Survey: Determining natural features rivers, lakes, forests, etc., and artificial features road, railway, cities, villages, etc. The larger the scale of the map, the smaller the contour spacing. The smaller the scale of the map, the higher the contour spacing. The contour lines of a plain are straight and parallel to each other. Nature of Ground:īut if the sloping of the ground is high, then the contour lines are far apart from each other.Īnd if the slope of the ground is low, then the contour lines are very close to each other. The contour line on the map ends at the point where it started.Īlso Read: What Is a Dead Load? | What Is Live Load? | Difference Between Dead Load Vs Live Load Contour Interval Depends on the Following Factors.Contour lines of similar height do not intersect.Four pairs of contour lines represent it. The lower part of the hill is called the saddle.If the height decreases from the outside to the inside in closed contour lines, it indicates a pit mark.As the height increases from the outside to the inside, it shows a hill mark in closed contour lines.If so, the contour lines are at equal distances. If the slope of the plains is uniform.While the contour lines of the elevated ground are crooked and irregular.The contour lines of a plain are straight and parallel to each other.And if the slope of the ground is low, then the contour lines are very close to each other.But if the sloping of the ground is high, then the contour lines are far apart from each other.But the contour line for overhanging cliff intersects each other. Two contour lines of different heights do not intersect each other.The vertical distance of all the points on the contour line is equal.The contour map helps to know the height of a given two points.Īlso Read: What Is Fire Escape Staircase? | Types of Fire Escaping Stairs | Fire Escape Staircase Regulations Characteristics of Contour.Very useful for determining line length of the road, pipeline, sewer line, railway line, etc.Used to draw a cross in any direction from the contour map.Contour maps can determine the area of a reservoir, which area lies in the lower part.The area of the closed discharge field is be determined from the contour map.The contour gradient is drawn from the contour map.The reservoir’s capacity helps to know from the contour map.Contour is used to select the location for the construction of dams, bridges, etc.Military tactics can be created using Contour.With the help of contour, knowing the topography of the ground helps.Maps are drawn with the help of contours.
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