Whats a contour interval10/7/2023 ![]() A contour line is a closed curve, however they may close either on the map itself or outside the map.All the points of a contour line have the same elevation.The contour interval depends upon several factors as.Smaller contour interval is more precise for the analysis.Generally contour intervals are taken 1 to 15m.It is desirable to have a constant contour interval, however in some special cases, a variable contour may also be provided.Elevation difference between two consecutive contours is called the contour interval.To calculate the amount of cutting, filling, and reservoir capacity.In planning and designing of construction like dams, reservoirs, aqueducts, transmission lines, etc.Identifying the intervisibility of stations.In deciding where to build new industrial plants.Engineering works such as roads, canals, and other structures must be placed correctly and precisely.Note: If contours are drawn underwater they are termed as submarine contour/ Fathoms/ Bathymetric Curves. And the process of tracing contour line on the surface of the earth is called Contouring. Or It may also be defined as the intersection of level surface with the ground of the earth. Unsteady Flow: Surge- Open Channel Flow (Chapter-6)Ī contour may be defined as an imaginary line passing through points of equal elevation on the earth surface.Rapidly Varied Flow: Hydraulic Jump- Open Channel Flow (Chapter-5).Gradually Varied Flow- Open Channel Flow (Chapter-4).Energy Depth Relationship- Open Channel Flow (Chapter-3).Uniform Flow- Open Channel Flow (Chapter-2).Open Channel Flow – Introduction (Chapter-1).To know more about Contouring click here. So, here we came to know that what is contouring in surveying. Similarly, a contour line cannot be split into two contours of same elevations. Two contours of same elevations cannot unite and continue as a single contour. However in case of vertical and overhanging cliffs, the contours appear to cross each other.ĩ. Two contours of different elevations cannot intersect each other, as their point of intersection will have two different elevations, as mentioned against the contour lines. The contour lines form V-shaped curve with their convex side towards higher element.Ĩ. Contour lines cross a valley line at right angles. ![]() The contours form U-shaped curves, with their concave side towards.ħ. Contour line cross ridge line at right angles. On the other hand, in case of a hill, the contours increase in elevation from outside to inside.Ħ. ![]() The contours increase in elevation from inside to outside if there should be an occurrence of a depression. If the contour lines are straight, parallel and equally spaced, it indicates a plane surface.ĥ. If contour lines are equally spaced, it indicates a uniform slope.Ĥ. The spacing is small for steep slopes and large for gentle slopes.ģ. The spacing between contour lines relies on the slope of the ground. They may close either of the map itself, or outside the map depending upon the topography.Ģ. The contours have the following characteristics:ġ. Where, n = number of contours RL = reduced level. The contour interval is selected based upon many factors like nature of ground surface and purpose of contouring.Ĭontour Interval = (RL of highest point – RL of lowest point) / (n + 1) Contour Interval and Horizontal EquivalentĬontour interval is the difference in elevations between two successive contour lines in a contour map. As contour maps shows the topography, they are also called topographic maps. Topography means the configuration of undulations of the earth surface. A contour map depicts the undulations in the form of contour lines to give a complete picture of the earth surface. What is contouring in surveying? Contouring in surveying is the method of taking measurements in the field so that the contour lines can be drawn on a map.
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