Suppose that you are standing at station0 + 00, figure 14-16. The elevation of this stationis 122.53 ft. Your HI is therefore.122.53 + 5.5 = 128.03 ft.You round off cross-section elevations to thenearest 0.1 ft. If a rodman holds a rod 40 ft tothe left of the center line at station 0 + 00 andyou read 1.9 ft on the rod, then the elevation ofthe point plumbed by the rod is128.0 – 1.9 = 126.1 ft.The rodman now moves on to a point 30 ftfrom the center line. If you read 3.3 ft on the rod,the elevation of this point is128.0 – 3.3 = 124.7 ft.Going on in this manner, you determine theelevations at all the required points on the crosssection. You then move to the next station andrepeat the process.Cross section notes are recorded in the fieldbook by using one of two basic methods. In thefirst, and often preferred, method, begin at thebottom of the page and read upward, as shownin figure 14-20. This method helps to keep youoriented in the direction in which the line runs andhelps to prevent confusion as to which is the rightor left side of the line. It therefore reduces thepossibility of recording your readings on thewrong side of the center line.In the second method, the notes are recordedin the conventional manner of reading from topto bottom of the page. Whichever method youuse, you must remember that as you standfacing the direction in which the line runs, leftFigure 14-20.-Sample field notes from cross-section leveling at first three stations shown infigure 14-7.14-19
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