Profile Leveling By Height Of Instrument (H.I) Method

Calculations:

1. The height of instrument position(1) can be calculated as:
          HI of position 1 = Elevation of BM + BS at BM 
2. The reduced level of any point (x) taken from position 1, can be calculated as: 
               R.L of point x = HI of position 1 – staff reading at point x 
3. The height of instrument position(2) can be calculated as:
               HI of position 2 = Reduced level of TP1 + BS at TP1 
4. The reduced level of any point (x) taken from position 2, can be calculated as:
               R.L of point x = HI of position 2 – staff reading at point x
5. And so on…. 

Check: 

 ∑BS - ∑FS = RL of last point – RL of first point

Tabulation: 

Video link for further elaboration :  

  https://www.youtube.com/watch?v=iWCt5ujkyvE