Cross SectionsA cross-sectional view (fig. 15-16) that is givenfor a road project is a cutaway end view of a proposedstation between the left slope and the right slope.Typical cross sections are plotted at any intermediateplace where there is a distance change in slope alongthe center line where the natural ground profile andgrade line correspond. The cross section displays theslope limits, the slope ratio, and the horizontaldistance between centerline stakes and shoulderstakes. It also shows the vertical distance of theproposed cut or fill at the shoulder and centerlinestakes.To compute the area of a cross section, you mustfirst break it down into geometric figures (squares,triangles, etc.). (See fig. 15-17.) Compute each areaseparately, then total the results to obtain the totalsquare feet.Figure 15-16.—Cross section.Figure 15-17.—geometric sections of a cross section.15-13
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