In this formula, W is the width of the highway; hland hr, are the vertical distances of the left and rightslope stakes above grade; dl and dr are the center-linedistances of the left and right slope stakes; and c is thedepth of the center-line cut or fill. Applying theformula for station 305 + 00 (fig. 10-4), you get thefollowing results:A = (40/4)(8.2+ 12.3)+ (9.3/2)(29.8+ 35.3)= 507.71square feet.AREA OF FIVE-LEVEL OR IRREGULARSECTION.— Figures 10-6 and 10-7 are the field notesand plotted cross sections for two irregular sections. ToFigure 10-7.—Cross-section plots of stations 305 and 306noted in figure 10-6.Figure 10-6.—Field notes for irregular sections.10-9
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