Calculation of Reduced Level

Reduction of levels can be done either by height of instrument method or by rise and fall method. In Table 14.1, computations have been carried out by both the methods and subsequently their checks are done.

Table 14.1 Field book for Reduction of Level

Pegs

Distance(m)

Direction

Staff Reading (m)

Difference in Elevation (m)

H.I (m)

R.L(m)

Remarks
B.S
I.S
F.S
Rise
Fall

A

 

 

3.005

 

 

 

 

108.620

105.615

B.M.

1

0+00

 

   

2.285

 

0.720

 

 

106.335

 

2

0+10

 

 

1.560

 

0.725

 

 

107.060

 

3

0+20

 

 

1.785

 

 

0.225

 

106.835

 

4

0+30

 

 

2.105

 

   

0.320

 

106.515

 

B

0+40

 

2.875

 

3.105

 

1.000

108.390

105.515

T.P.1

5

0+50

 

 

3.465

 

   

0.590

 

104.925

 

X

0+53.35

 

 

3.955

 

 

0.490

 

104.435

 

6

0+60

 

 

3.120

   

0.835

 

 

105.270

 

7

0+70

 

 

3.015

 

0.105

 

 

105.375

 

8

0+80

 

 

2.580

 

0.435

 

 

105.810

 

9

0+90

 

 

1.955

 

0.625

 

 

106.435

 

C

1+00

 

 

 

1.465

0.490

 

 

106.925

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S

5.880

 

4.570

3.935

2.625

 

 

 

S B.S. - S F.S. = 5.880 – 4.570 = 1.310m

S Rise- S Fall = 3.935 – 2.625 = 1.310m

Last R.L. - First R.L.= 106.925 - 105.615 = 1.310m

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