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7 Pages • Essays / Projects • Year Uploaded: 2021
Levelling is a method to measure the elevation difference between two (2) or more points. In this practical, focus is shifted to one of levelling techniques namely, fly level observation or also known as the rise and fall method. The observation will be initiated from a known reduced level (RL) value of a benchmark (BM) and end at another known RL value of BM. In between the BMs, a number of change points (CPs) will be set up to observe the fore sight (FS) reading and the back sight (BS) reading of each stationed stave and the values are booked. Upon completion of the observation, the RL values will be calculated and booked. After the RL values are known, arithmetical checks will be calculated to ensure the precision of the works. Consequently, the adjustment value can be computed where this value will be distributed accordingly to each station. Finally, the adjusted RL values are booked and the misclosure will be calculated to be compared with the adjusted values to determine whether the levelling works is accepted or unsatisfactory.
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