How do you calculate RL levels?

Once you have taken all the levels you want, you will need to calculate the actual height values, or reduced levels ( RL ) by subtracting each one from the instrument height (IH). This gives you the ‘real’ height of the ground at the base of the staff.

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.

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.

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.
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What is an RL height?

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 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.

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 does RL mean in mining?

RL – Reduced level. This refers to a level once it has been reduced to a datum. ROM – Raw Ore Material or Run Of Mine, an area where mined material is stored prior to preparation and train loading.

What is Rise and Fall method?

Rise and Fall Method is the method of calculating the difference in elevation between consecutive points in levelling work. Some of the points you have to know before starting numerical are: Back sights: The first reading after seeing the instrument is called back sights.

What is FFL plan?

A floor plan shows an overhead view of the floor plan. The floor plans will also have the finished floor levels ( FFL ) on them so the builder knows how high above natural ground (NGL) the house is to be.

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.

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Why RL is given?

Ringer’s lactate solution ( RL ), also known as sodium lactate solution and Hartmann’s solution, is a mixture of sodium chloride, sodium lactate, potassium chloride, and calcium chloride in water. It is used for replacing fluids and electrolytes in those who have low blood volume or low blood pressure.

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 meant by fly Levelling?

Fly levelling is a very approximate form of levelling in which sights are taken as large. as possible. In this method a line of levels is run to determine approximately reduced levels. of the points carried out with more rapidly and less precision.

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