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of /home/abouaayt/public_html/aboutcivil/answers/qa-plugin/user-management/layer.php why the MSL is taken beneath 20 m below the water surface of sea level? - Civil Engineering Technical Questions Answers - Ask a Civil Engineer
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why the MSL is taken beneath 20 m below the water surface of sea level?

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why the MSL is taken beneath 20 m below the water surface of sea level?

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MSL is the mean sea level that is taken as a reference for the whole measurments taken  on the entire earth surface.It is a frame of reference.Because there is no other possibility to take the readings with any other reference frame.Sea level also varies at different places.But average sea level/MSL is taken as the frame of reference.
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