1.15.5. Reduction of levels

Try these first

1. 1.

   Define the term 'Reduced Level'.

   Hint

   What does RL refer to in leveling?

2. 2.

   What does BS stand for in leveling?

   Hint

   It refers to the reading taken on a point of known elevation.

3. 3.

   What does RL stand for in surveying?

   Hint

   Think about what you measure in leveling.

4. 4.

   In the Rise and Fall method, if BS - FS is positive, what does it indicate?

   • A rise
   • A fall
   • No change

   Hint

   Think about how the staff readings correlate.

5. 5.

   You have the following staff readings for three points: BS(1) = 2.0 m, FS(1) = 1.5 m (RL = 100 m), BS(2) = 1.5 m, FS(2) = 0.5 m. Calculate the RL for point 2.

   Hint

   Apply the Rise and Fall principles to find point elevations.

6. 6.

   A survey line has three points with the following data: RL(BM) = 250 m, BS = 1.0 m, FS(3) = 2.4 m. What is the Height of Instrument and the RL at point 3?

   Hint

   Break down the process into HI calculation and then use that to find RL.