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METHODS  OF  LEVELING
LEVEL  COMPUTATIONS

Engineering Aid 3 - Beginning Structural engineering guide book
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a  point  of  known  elevation  (KE).  Then  add  the BS reading to the known elevation to determine the HI. Next, take an FS on a rod held at the point of  unknown  elevation  (UKE).  Finally,  subtract the  FS  reading  from  the  HI  to  establish  the elevation  of  the  new  point. After  you  complete  the  FS,  leave  the  rod  on that  point  and  move  the  instrument  forward. Set  up  the  instrument  approximately  MIDWAY between the old and new rod positions. The new sighting on the back rod becomes a BS, and you can now establish a new HI. The points other than the BMs or TBMs on which you hold the rods for the BSs and FSs are called TURNING POINTS (TPs).  Other  FSs  made  to  points  not  along  the main route are known as SIDESHOTS. You can use this procedure as many times as necessary to transfer  a  point  of  known  elevation  to  another distant  point  of  unknown  elevation. Figure 14-14 shows a sample differential leveling run. The rod is held on BM 35 (Elev. = 133.163). The level is set up midway between BM 35 and Figure  14-13.-Differersthd  leveling. Figure 14-14-—Sample field notes and profile of a differential-level circuit. 14-13







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