Ex14-1 Following staff readings were taken with a level. The instrument having been shifted after the 4th, 7th and 10th reading. R.L. of the starting B.M. is 100.00 m. Enter the reading in the form of a level book page. Find the R.L. of stations and apply usual checks.
2.665, 3.745, 3.830, 2.275, 2.645, 0.385, 0.960, 1.640, 2.845, 3.845, 2.680 and 3.265
Solution :
Observation Station |
B.S.(m) |
I.S.(m) |
F.S.(m) |
H.I.(m) |
R.L.(m) |
Remark |
1 |
2.655 |
|
|
102.655 |
100.00 |
B.M. |
2 |
|
3.745 |
|
|
98.910 |
|
3 |
|
3.830 |
|
|
98.825 |
|
4 |
2.645 |
|
2.275 |
103.025 |
100.380 |
CP1 |
5 |
|
0.385 |
|
|
102.640 |
|
6 |
1.640 |
|
0.960 |
103.705 |
102.065 |
CP2 |
7 |
|
2.845 |
|
|
100.860 |
|
8 |
2.680 |
|
3.485 |
102.900 |
100.220 |
CP3 |
9 |
|
3.265 |
|
|
99.635 |
|
S |
9.620 |
|
9.985 |
|
|
|
S B.S. - S F.S. = 9.620 - 9.985 = - 0.365 m
Last R.L. - First R.L. = 99.636 - 100.00 = - 0.365 m
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