# Quick Answer: What Do You Mean By Positive RL And Negative RL?

## How do you calculate RL?

Rise (R) = Back-sight (B.S.) – Foresight (F.S.) Reduced Level (R.L.) = Precede Reduced Level + Rise (R) Reduced Level (R.L.) = Precede Reduced Level – Fall (F) Calculation checks, Σ B.S.

– Σ F.S.

= Σ R – Σ F = Last R.L.

– First R.L..

## What is RL in result?

RL means- Result later.

## What is Profile Levelling?

Profile leveling is a method of surveying that has been carried out along the central line of a track of land on which a linear engineering work is to be constructed/ laid. The operations involved in determining the elevation of ground surface at small spatial interval along a line is called profile leveling.

## What are the importance of Levelling?

Explanation: Importance of levelling in field work. Leveling is a method or element of land surveying which deals with determining points on land surface above sea level. The points of known height are called benchmarks and they are determined from an assumed zero height point at sea level called datum.

## What is HI method?

Height of Instrument is one of the important method to find out the Reduced Levels (RL’s) of the ground. … In this video detailed method of how to calculate RL’s is explained thoroughly with the help of figure, solving a numerical, how to enter surveyed readings in field book and applying arithmetic check.

## What does RL mean?

real lifeThe abbreviation RL stands for “real life” in the truncated parlance of the internet. It is used to reference “my other responsibilities” or “what I do when I am not on the computer.” A variation is IRL, which stands for “in real life.”

## How do you take rl in a survey?

Procedure:Set up the leveling instrument at Level position 1.Hold the staff on the Datum (RL+50 m) and take a reading. … Move the staff to A and take a reading. … Move the staff to B and take a reading. … Move the staff to C and take a reading. … Move the staff to D and take a reading.More items…

## What is datum point?

Noun. datum point (plural datum points) A point which serves as a reference or base for the measurement of other quantities.

## What does RL mean on plans?

Reduced levelReduced level (RL): this is the height or elevation above the point adopted as the site datum for the purpose of establishing levels. To establish the required depths for a drainage system you need to work from the datum point.