How to Calculate Adjusted Reduced Levels and Misclose in Surveying

What calculations are needed to find the adjusted reduced levels and misclose in surveying?

Given the data below, what are the steps to calculate: a) The adjusted reduced levels for all of the pegs if the given BM M21 value is at 11.160m b) The allowable misclose for the level run c) The difference in height between point CP 4 and CP5

Solution:

The first step is to calculate the reduced level of each point, which is the difference in height between the given BM and each point. The reduced level is calculated by subtracting the height of the BM from the reading at each point.

For BM M21, the given value is 6.345. Since the height of the BM is known (11.160 m), we can calculate the reduced level of each point by subtracting the BM from the reading at each point.

After calculating the reduced levels for all points, we can then adjust the reduced levels by adding the given adjustment value. The adjusted reduced levels are used to find the misclose and the height difference between two points. The allowable misclose is the acceptable difference between the calculated misclose and the actual misclose.

By following these steps, we can determine the adjusted reduced levels for all pegs, the allowable misclose for the level run, and the height difference between point CP 4 and CP5.