how to make a profile from contour lines
Place the paper with the labeled contour lines at the bottom of the profile paper and project each contour to the horizontal line of the same elevation. f. Connect the points. Stream Gradient: Stream gradient can also be determined from a topographic map. profile may be constructed quickly and accurately across any straight line on a map by following this procedure: a. Lay a strip of paper along a line across the area where the profile is to be constructed. b. Mark on the paper the exact place where each contour, stream and hill top crosses the profile line.