I start by drawing the big general shape the best I can.īe aware that this is just my best first attempt. (in an upcoming lesson we will look in detail at the block-in.) Simplify the shapes and help you see the outline more clearly). Now focus on just the big outer shape (squinting will It’sĮasy to get overwhelmed by all the different lines and shapes. If you can see the big outer silhouette you can drawĪ simple containing shape to fit your subject into. The key is to look past the inner contours at first and focus on Now that we have a definition for contour line, how do we But for now just be aware that shadows are a separate drawing element. We will get into detailed lessons about shadows in Drawing Essentials: Level 3. Shadows are their own element and are very important in showing the form of objects. It represent by V –shaped.I don't consider shadows to be contour lines at all. 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.
Contour line definition series#
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).