Question

4. In Problems 4() and 4(ii) below, the accompanying illustrations represent plans for differential levelling. The values shown on each line represent the sights taken along those lines. All measurements are in metres. Prepare and complete the necessary filed notes for these surveys using the Height of Instrument Method. Perform all necessary checks and corrections if applicable. (Notes: • represents staff, while denotes instrument setup: BM = bench mark; TP = turning point; EL = elevation) (7.5 marks for each question) 0.149 BM2 2.168 1.743 2.3110 EL = 9.752 m BMI EL = 7.159 m TP1 Station BSFSHI RL RL corrected Notes TP1

Answer 1

Reconnect 7. 159 ESTATION 3.5 ts ni RL BMI 2.768 9.32744 7.159 Tei (2.311 1.743 9.8951 20584 041499 9.746 2.987 7.752 BM2 4.979 1.892 1 HI ett в {B. S- Els = 2,587 RE- NI- As Last Rol- fost RL=2.5 essor-9752-9.346=(0.006)

correction Istation | BS IF THI corrected Re 13.575 0.00 l 14:53 0.955 / 13.575 BML 7 | 7 3 1 2 167 | 15, 21h (2.45 | 0 , 0 ) . 112.414 112.897 T12 I -0.02 11.611 11.330 114.528 12.917 1 -0.03 1 13.575 Дм 0.923 14.389 | 4.359, nos elt BS & RL2 HI-Fs CHECK EBS - EES = 0.03 cast RL- First RL = 13.685-13.575 = 0.03 au Last RL- ENTR2 is correct essora 0.03 o distributing it miformly

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