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of /home/abouaayt/public_html/aboutcivil/answers/qa-plugin/user-management/layer.php Why to take always RL of BM as 100.000? - Civil Engineering Technical Questions Answers - Ask a Civil Engineer
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Why to take always Reduced Level of Benchmark as 100.000?

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Its not necessary. But it helps in the calculations. After doing all the calculations, you can directly say that the last station is a certain meter higher or lower elevation with respect to the BM without any calculation.
That is why it is taken like that.You can try with some other no also.
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