The following readings were taken with a level on a 5m staff in a levelling I'S operation from points 1 to 12, (2.08, 1.625, 3.2, (1.67 and 2.74) CP, 218, (0.825 and 1.12) CP, 2.95, (1.35 and 2.55) CP, 4.05, (1.75 and 3.35) CP, 2.78, 3.27). Points 1 and 12 are a bench marks having elevations (210 m and 212.55m respectively. 

1- Find elevation of all points by rise and fall method and apply appropriate check. 

2-Determine the loop closure and adjust the calculated value of the elevations.

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