The relief on the terrain plans and maps is depicted using linear conventional signs, namely, using contour lines and semi-contour lines. A horizontal line is an imaginary line passing through points with the same elevation. The height of the points through which the horizontal passes must be signed on plans and maps. The direction towards the catchment areas is indicated with the help of bergstrikes. The horizontal lines are drawn through a distance equal to the accepted height of the relief section. Dotted half-horizontal lines can be drawn between the horizontal lines.
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