#Rise&fallMethod #Levelling
Dear friends, here i have discussed about Rise and Fall Method of Levelling of Surveying in Civil Engineering.
for the discussion a numerical example is used and Check is also Applied
There are two main methods of booking levels:
height of collimation method or height of instrument method
and rise and fall method
Also discussed about the terms like Back sight, Fore sight, Intermediate sight and Reduced level.

The millimeter reading may be taken by estimation to an accuracy of 0.005 metres or even less.
Backsight, intermediate sight and forsight readings are entered in the appropriate columns on different lines. However, as shown in the table above backsights and foresights are place on the same line if you change the level instrument.
The first reduced level is the height of the datum, benchmark or R.L.
If an intermediate sight or foresight is smaller than the immediately preceding staff reading then the difference between the two readings is place in the rise column.
If an intermediate sight or foresight is larger than the immediately preceding staff reading then the difference between the two readings is place in the fall column.
A rise is added to the preceding reduced level (RL) and a fall is subtracted from the preceding RL