![]() ![]() Common contour intervals are 5, 10, 20, 40, 80, or 100 feet. Individual contour lines on a topographical map are a fixed interval of elevation apart known as a contour interval. What is the contour interval of this map? 4 What is a contour interval on a topographical map?.3 What are the factors of contour interval?.2 What is the definition of index contour in science?.1 What is the contour interval of this map?.Line joining the lowest point of a valley across the contours at right is called Valley line. If the higher values are outside the loop in the contour it indicates a Valley. Line joining the highest point of a hill across the contours at right angles is called Ridge line. If the higher values are inside the loop in the contour it indicates a Ridge. For a hill reading increasing towards center, and for a pond reading decreasing towards center. Close contour loops represent either a hill or pond.Irregular contours represent rough terrain.Ridge line / Valley line intersects contour at right angle.But if contours are distant then it shows a relatively mild slope. If the contours are closely spaced then it shows steep slope. ![]() #Contour interval seriesA series of closed contour line on the map represent depression, if the higher values are outside.A series of closed contour line on the map represent a hill, if the higher values are inside.If contours are parallel and equally spaced then it represents a uniform slope.In this case, several contours coincide and the horizontal equivalent become zero. Contour lines never run into one another except in the case of a vertical cliff.Contour line do not merge or intersect each other except in the cases of an overhanging cliff or cave in the hillside.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. ![]()
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