stations 11 + 00 and 11 + 43 have been plotted.The field party took, for each station, the groundelevation 40 ft to both the right and to the leftof the center line. For each station, however, thecenter-line distance of the intermediate elevationsvaries. Therefore, these are irregular sections.For both of the stations plotted, the HI was76.70 ft. For the point 6 ft left of the center lineat station 11 + 00, note the 4.2 written below the6. This reading was obtained from a rod held onthis point. The number 72.5 shown in theparentheses right below the number 4.2 is theelevation of this point. You obtain the elevationby subtracting from the HI, the rod reading FS:76.70 – 4.20, or 72.50You can see this point is plotted 6 ft to the leftof the center line and at an elevation of 72.5 ftin figure 14-29, view B. Now if the notes arereduced in the office, the general practice is toprint the elevations in RED; then the elevationjust computed (72.5) will appear in red in thecross-section notes (fig. 14-29, view A).After the road gradients, either preliminaryor final, have been designed, plot the design datacross section on the existing ground line sectionplot at each station to complete the picture of theend-area as it will be in the finished highway.Obtain the finished grade elevation for eachstation from the profile. Plot the finished gradepoint usually located on the center at each crosssection. Then draw in the outline of the pavementsurface, ditches, and cut or fill slopes as they showon the typical design section. Plotting may bedone with triangles, but a faster method is to usetemplates made of plastic, thin wood, sturdycardboard, or other suitable material. Preparetemplates for a cut section, a fill section, anda sidehill section that may be flipped over toaccommodate the direction of hillside slope.The procedures just described are the mostcommon and pertain to irregular sections.However, if regular sections have been taken inthe field after the gradients have been designed,then both the existing and the finished surfaceswill be plotted. Field notes for simplified three-level sections on a highway are shown in figure14-30. On the data side, the profile elevation andthe grade elevation at each station are listed. Inthe columns headed Left and Right on theFigure 14-30.-Field notes for three-level cross sections.14-33
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