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Activity 3 - Levelling

The document provides three problems related to leveling surveying. Problem 1 involves calculating elevation differences between points using leveling data. Problem 2 involves calculating elevation differences between points using reciprocal level readings across a river. Problem 3 involves a two-peg test using alternate leveling methods to determine elevation differences and instrument errors.

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Mateo Hernandez
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867 views2 pages

Activity 3 - Levelling

The document provides three problems related to leveling surveying. Problem 1 involves calculating elevation differences between points using leveling data. Problem 2 involves calculating elevation differences between points using reciprocal level readings across a river. Problem 3 involves a two-peg test using alternate leveling methods to determine elevation differences and instrument errors.

Uploaded by

Mateo Hernandez
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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NATIONAL UNIVERSITY – MANILA

CIVIL ENGINEERING DEPARTMENT

FUNDAMENTALS OF SURVEYING – FIELDWORK

ACTIVITY 3 – LEVELLING

Answer the ff. problems

Prob. 1

Data shown is obtained from a double rodded line of levels of a certain cross-section of the
proposed Manila-Bataan Road.

a.) Find the diff. in elevation between TP1 and TP3.


b.) Find the elevation of BM2.
c.) What is the difference in elevation between BM1 and TP2.

Prob. 2:

In levelling across a wide river on Pampanga, a reciprocal level reading were taken between
points B and C as shown in the tabulation.

a.) Compute the difference in elevation between B and C with instrument set up near B.
b.) Compute the true difference in elevation between B and C.
c.) If the elevation of B is 346.50 m, compute the elevation of C.
Prob. 3

In the two-peg test of a dumpy level using alternate method, the full observation was taken.

Instrument set up near M Instrument set up near P


Rod Reading on point A 0.296 m 1.563 m
Rod Reading on point B 0.910 m 2.140 m

Point M is equidistant from both A and B, while P is 2.50 m. away from A along the extension of
line AB and 79.27 m from B.

a.) Determine the true difference in elevation between A and B.


b.) Determine the error in the rod reading at B with the instrument still at P.
c.) Determine the correct reading on rod B for a horizontal line of sight with the instrument
still at P.

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