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In Surveying, RL or Reduced Level is a vertical distance or height with reference to assumed datum line. In India we uses mean sea level of chennai as a datum line or datum point. Suppose we are surveying in an area and we have to calculate the elevations of the ground or to find oud the variationsRead more
In Surveying, RL or Reduced Level is a vertical distance or height with reference to assumed datum line. In India we uses mean sea level of chennai as a datum line or datum point. Suppose we are surveying in an area and we have to calculate the elevations of the ground or to find oud the variations like rise or fall we need a reference point whose height or cordinates with reference to assumed datum line is known is called Reduced Level. In some cases for temperory work if RL is too far than we assumed a point or reference to calculate the same is called B.M. (Bench Mark).
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