What is a RL in construction?

Reduced 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. The datum is taken as a reduced level of 10,000.

What is RL on a floor plan?

Reduced level ( RL ): this is the height or elevation above the point adopted as the site datum for the purpose of establishing levels.

How do you calculate RL?

– method to calculate RL; height of collimation (H of C) = reduced level( R.L. ) + backsight (B.S.) reduced level ( R.L. ) = height of collimation (H of C) – foresight (F.S.) reduced level ( R.L. )

What is RL in surveying?

From Wikipedia, the free encyclopedia. Relative level in surveying refers to equating elevations of survey points with reference to a common assumed datum. It is a vertical distance between survey point and adopted datum plane.

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What do RL mean?

Summary of Key Points

Definition: Real Life
Type: Abbreviation
Guessability: 2: Quite easy to guess
Typical Users: Adults and Teenagers

What is RL full form?

Advertisement. Ad. The Full form of RL is Ringer’s Lactate Solution. RL is a type of isotonic, crystalloid fluid further classified as a balanced or buffered solution used for fluid replacement. Ringer’s Lactate Solution is also known as Lactated Ringer’s solution (or RL ).

What is the difference between RL and FFL?

Hello and welcome to Just Answer. I don’t see it that often but engineers and surveyors use R.L. for Relative Level or Reduced Level. It is a measurement of height taken from some known datum. F.F.L is First Floor Level.

What is the highest RL that the FFL can be?

Frequently on contract drawings (plans, sections and elevations), finished floor level may be abbreviated ‘ FFL 27,000’, the figure suffixed denoting the level in metres above a defined datum level (usually outside ground level or ground floor level). The floor above may be FFL 31,000 and the floor below FFL 23,000.

How do you take rl in a survey?


  1. Set up the leveling instrument at Level position 1.
  2. Hold the staff on the Datum ( RL +50 m) and take a reading.
  3. Move the staff to A and take a reading.
  4. Move the staff to B and take a reading.
  5. Move the staff to C and take a reading.
  6. Move the staff to D and take a reading.

How do you calculate RL level?

9. 8 Rise and Fall Method This method consists in finding the difference of level between consecutive points by comparing each point after the first with that immediately preceding it. The reduced level ( R.L. ) is found by adding rise of subtracting fall to or from the preceding reduced level itself ( R.L. ).

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How do you calculate RL from Rise and Fall?

Rise and Fall Method is the method of calculating the difference in elevation between consecutive points in levelling work. Arithmetic check:

  1. Last R.L – First R.L = 42.842 – 43.000 = -0.158 m.
  2. ∑B.S – ∑F.S = 7.561 – 7.719 = -0.158 m.
  3. ∑ Rise – ∑ Fall = 4.932 – 5.090 = -0.158 m.

What is Profile Levelling?

Profile levelling is the process of levelling along a fixed line to determine the elevations of the ground surface along the line. Profile levelling is also known as longitudinal sectioning. Use of profile levelling: The ground profile shows the elevations of the ground along the section.

What is TBM level?

Temporary Bench Mark ( TBM ) – a point of known height above a pre-defined level. This level is not absolute and is defined locally by the surveyor for the purpose of the survey.

How do you calculate RL by HI method?

Height of Instrument Method | Surveying and Levelling

  1. Height of the Instrument Method.
  2. Determine the RLs of various points if the reduced level ( RL ) of a point on which the first reading was taken is 136.440 gives the height of collimation method and applies the check.
  3. HL = RL + BS.
  4. Check.

What is height of collimation method?

Height of Collimation is the height of the horizontal plane through the telescope. The survey station is below the horizontal plane through the instrument, so to find reduced level, or ground height, take the staff reading away from Height of Collimation.

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