Question

Problems 117 PROBLEMS 7.6 PS 7.1 Explain the difference between tuming points and bench marks In Problems 7.2 to 7.4. complete and check the level notes shown 7.2 M 167 --- BIH 7.4 ASS MP3 TO TH TF км, EL Station BS HI FS Elevation 7.7 88.00 BM TP, TP: ТР, BM 2.45 5.43 3.18 4.22 6.53 1911 701 AM 8.113 . 4.91 7.42 6,11 EL - 6 A TI TY: 73 Station BS HI FS Elevation BM 731.085 ТР. 5.136 6.398 5.227 4.745 6.910 TP, TPS TP4 BM: (Ans: BM=551.701) In Problems 7.8 to 7.10, the accompanying illustrations represent plans for differential leveling. The values shown on cach line represent the sights taken along those lines. Prepare and complete the necessary field notes for this work (Y=instrument setup) 7.8 2.280 4.401 6.827 3.982 0.535 (Ans...741.476) 2.1 во, TI 7.4 Station BS HI FS Elevation 7.9 450.241 BM ТР, TP, BM ТР, BM, 6.224 3.187 2.943 1.776 7.830 7.181 4.205 1.065 5.493 6.798 137145 (Ans.: BM-137.690) 7.10 In Problems 7.5 to 7.7, set up and complete differential level notes for the information shown in the accompanying illustrations. Include the customary math checks. 7.5 (Ans.: BM, 216.72) BM, OM 14 115 - 2018 IT BM FS-400 5-16

please I need assistance with exercises 7.3 & 7.9
thank you!!

Answer 1

7.3 Height of Instrument method is used to solve this problem.

In height of instrument method,

Height of instrument = Elevation ( or Reduced Level) + Backsight

Elevation of any point = Height of Instrument - Foresight

Step 2: Add Back sight to Elevation to get Height of instrument Station Da Step 1: Subtract Foresight from Height of instrument to get nt Foresight Height Elevation Instrument 736.221 731.085 BM1 5.136 TP1 6.398 2.280 740.339 -733.941 TP2 5.227 4.401 741.165 735.938 TP3 4.745 6.827 739.083 734.338 TP4 6.910 3.982 742.011 735.101 BM2 0.535 741.476

First Follow Red arrow and then follow green one. Repeat the step till last point.

The final Table after calculation is shown below:

Elevation Station Back sight Foresight Height of Instrument BM1 5.136 736.221 731.085 TP1 6.398 2.280 740.339 733.941 TP2 5.227 4.401 741.165 735.938 TP3 4.745 6.827 739.083 734.338 TP4 6.910 3.982 742.011 735.101 BM2 0.535 741.476

7.9 The data is blurred due to smaller size and poor quality of image. Please capture the image again possibly that part only and again post it for solution.

In general, This question will also be solved with the height of instruent method.

For every station, you need to calculate the height of instrument and for every other point (turning point), you need to calculate Elevation of that point.

Height of instrument = Elevation ( or Reduced Level) + Backsight ( one reading before station)

Elevation of any point = Height of Instrument - Foresight ( one reading before turning point or one reading after station)