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A level instr...

Question

A level instrument at a height of 1.320 m has been placed at a station having a reduced level (RL) of 112.565 m. the instrument reads - 2.835 m on a levelling staff held at the bottom of a bridge deck. The RL (in m) of the bottom of the bridge deck is

A

114.080

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B

116.080

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C

116.720

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D

111.050

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Solution

The correct option is C 116.720
(Bottom of bridge deck staff reading is -ve indicates inverted staff.)
$H e i g h t o f i n s t r u m e n t = 112.565 + 1.320$ $= 113.885 m$
$R L o f b o t t o m o f b r i d g e = 113.885 + 2.835$ $= 116.720 m$

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