Answer / upenderreddy

in levelling we will use the reduced level of bench mark
which is point of level from mean sea level

Answer / abhimanyu

For determining the reduced level of any point on ground, we required a bench mark(point whose height from the mean sea level is specified). So, we use mean sea level for the levelling process.

Answer / beachboy

Distance from benchmark zero established relative to
surface of flat sea distance from centre of earth on an
internationally agreed reference date.

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